Cooling Fan Control
The engine cooling fan system is composed of one electric cooling fan and a control module, which is part of the cooling fan and motor assembly. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal, which allows the cooling fan to operate at variable speeds.
The cooling fan speed is effected by many different conditions and the ECM will adjust the duty cycle from 0-100 percent based on cooling system requirements. The scan tool output control is only capable of operating the cooling fan increments, between 10-90 percent. 90 percent is considered high speed fan. When multiple cooling fan speed requests are received, the ECM operates the fan at the highest of speed requests. The ECM commands the fans ON under the following conditions
- The engine coolant temperature is warmer than a predetermined temperature.
- The engine oil temperature is warmer than a predetermined temperature.
- The A/C pressure reaches a predetermined pressure.
- If the engine coolant temperature at key-off is warmer than a predetermined value, or the A/C pressure is greater than a predetermined value, the cooling fan will operate at a low speed. The fan will shut OFF if the temperature or pressure drops below the predetermined value, but will only operate for 2 minutes, regardless of the coolant temperature or A/C pressure.
Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 puller type electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and the fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.
During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan s/p relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3-second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan s/p relay through the high speed cooling fan relay control circuit. This energizes the cooling fan s/p relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
The ECM commands the low speed cooling fans ON under the following conditions
- Engine coolant temperature exceeds approximately 94.5°C (202°F).
- A/C refrigerant pressure exceeds 1447 kPa (210 psi).
- After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101 °C (214 °F) the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101 °C (214 °F) the fans will shut OFF. The fans will automatically shut OFF after 3 minutes regardless of coolant temperature.
The ECM commands the high speed fans ON under the following conditions
- Engine coolant temperature exceeds 104°C (220°F).
- A/C refrigerant pressure exceeds 1824 kPa (265 psi).
- When certain DTCs set.
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed if required. This insures idle stability by preventing the fans from cycling between high and low speed.
Cooling Fan Control - Heavy Duty Cooling
The engine cooling fan system consists of 2 electrical pusher, 2 electrical puller type cooling fans and 3 fan relays. The low speed, high speed, and S/P relays are arranged in a series/parallel configuration that allows the ECM to operate the left cooling fan and right cooling fan together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.
During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3-second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
The ECM commands the low speed fans on under the following conditions
- Engine coolant temperature exceeds 94.5°C (202°F).
- A/C refrigerant pressure exceeds 1447 kPa (210 psi).
- After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 4 minutes regardless of the coolant temperature.
The ECM commands the high speed fans ON under the following conditions
- Engine coolant temperature exceeds 104°C (220°F).
- A/C refrigerant pressure exceeds 1824 kPa (265 psi).
- When certain DTCs set.
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed if required. This ensures idle stability by preventing the fans from cycling between high and low speed.
Engine Coolant
Engine coolant is the essential element of the heating system. The engine thermostat controls the normal engine operating coolant temperature. Coolant pumped out of the engine block enters the heater core through the inlet heater hose. The air flowing through the HVAC module absorbs the heat of the coolant flowing through the heater core. The coolant then exits the heater core through the heater outlet hose. To prevent the coolant from boiling after the engine is turned off an after-boil/heater coolant pump is used.
The HVAC control module will command the after-boil/heater coolant pump on when the engine is off under the following conditions
- The engine is OFF.
- The engine coolant temperature is greater than 101°C (214°F).
The above coolant flow circuits are designed to show the coolant flow related to the coolant by-pass valve positions only. The thermostat function and thermostat coolant flow paths are not shown.
Coolant Warning Messages
The radio will display the following messages if the following conditions exist in the cooling system.
- Engine hot-A/C OFF, is displayed if the coolant temperature is greater than 117°C (243°F) for domestic vehicles or 115°C (239°F) for imports.
- Engine coolant hot-idle engine, is displayed if the coolant temperature is greater than 118°C (245°F).
- Engine overheated-stop engine, is displayed if the coolant temperature is greater than 123°C (253°F).
Coolant Level Control
The engine cooling system contains an engine coolant level switch to alert the driver in the event of a low coolant level. When the engine coolant level in the surge tank falls below a certain level, the coolant level switch opens. When the HVAC control module detects an open, or a high voltage level, on the coolant level indicator control circuit for at least 10 seconds, the control module sends a class 2 message to the radio requesting display of the low coolant level message. A 10-second delay occurs before the HVAC control module sends the class 2 message, to prevent the message from being displayed due to coolant sloshing in the surge tank.
Coolant Heater
The optional engine coolant heater (RPO K05) operates using 110-volt AC external power and is designed to warm the coolant in the engine block area for improved starting in very cold weather - 29°C (- 20°F). The coolant heater helps reduce fuel consumption when a cold engine is warming up. The unit is equipped with a detachable AC power cord. A weather shield on the cord is provided to protect the plug when not in use.
The cooling system's function is to maintain an efficient engine operating temperature during all engine speeds and operating conditions. The cooling system is designed to remove approximately one-third of the heat produced by the burning of the air-fuel mixture. When the engine is cold, the system cools slowly or not at all. This allows the engine to warm quickly.
Cooling Cycle
The thermostat is located between the radiator outlet and the water pump inlet. At normal operating temperature, coolant is drawn from the radiator outlet and into the water pump inlet by the water pump. In cold conditions, the thermostat will bypass the radiator, and the pump will draw coolant directly from the engine outlet.
Coolant is then pumped through the water pump outlet and into the engine block. In the engine block, the coolant circulates through the water jackets surrounding the cylinders where it absorbs heat.
The coolant is then forced through the cylinder head gasket openings and into the cylinder heads. In the cylinder heads, the coolant flows through the water jackets surrounding the combustion chambers and valve seats, where it absorbs additional heat.
Coolant is also directed to the throttle body. There it circulates through passages in the casting. During initial warm-up, the coolant assists in warming the throttle body. During normal operating temperatures, the coolant assists in keeping the throttle body cool.
From the cylinder heads, the coolant is then forced to the engine outlet. Coolant leaves the engine through four different routes
- Through the engine outlet fitting to the radiator. This path is blocked at cold conditions by the thermostat at the engine inlet fitting.
- Through the radiator bypass.
- To the heater core for passenger compartment heat and defrost.
- Through the vent hose to the surge tank, providing continuous direction of the cooling system.
Operation of the cooling system requires proper functioning of all cooling system components. The cooling system consists of the following components
Coolant
The engine coolant is a solution made up of a 50-50 mixture of DEX-COOL and clean drinkable water. The coolant solution carries excess heat away from the engine to the radiator, where the heat is dissipated to the atmosphere.
Radiator
The radiator is a heat exchanger. It consists of a core and two tanks. The aluminum core is a crossflow tube and fin design. This is a brazed tube with convoluted louvered fin design. Separate tubes and fins are stacked together with a manifold at each end. The entire core assembly is then brazed forming a homogeneous unified structure. The fins allow for efficient heat transfer from the coolant to the atmosphere. The inlet and outlet tanks are molded with a high temperature, glass reinforced nylon plastic. The tank and gasket is supplied as an assembly with silicone gasket attached to the tank. The tanks are clamped to the core with clinch tabs. The tabs are part of the aluminum header at each end of the core. The radiator also has a drain cock which is located in the bottom of the passenger side tank. The drain cock includes the drain cock and drain cock seal.
The radiator removes heat from the coolant passing through it. The fins on the core absorb heat from the coolant passing through the tubes. As air passes between the fins, it absorbs heat and cools the coolant.
During vehicle use, the coolant heats and expands. The coolant that is displaced by this expansion flows into the surge tank. As the coolant circulates, air is allowed to exit. Coolant without bubbles absorbs heat much better than coolant with bubbles.
Pressure Cap
The pressure cap is a cap that seals and pressurizes the cooling system. It contains a blow off or pressure valve and a vacuum or atmospheric valve. The pressure valve is held against its seat by a spring and protects the radiator by relieving pressure if it exceeds 18 psi. The vacuum valve is held against its seat by a spring, which permits opening of the valve to relieve vacuum created in the cooling system as it cools off. The vacuum, if not relieved, could cause the radiator hoses to collapse.
The pressure cap allows pressure in the cooling system to build up. As the pressure builds, the boiling point of the coolant goes up as well. Therefore, the coolant can be safely run at a temperature higher than the boiling point of the coolant at atmospheric pressure. The hotter the coolant is, the faster the heat moves from the radiator to the cooler passing air. However, if the pressure exceeds the strength of the spring, the pressure valve rises so that the excess pressure can escape. When the engine cools down, the temperature of the coolant drops and a vacuum is created in the cooling system. This vacuum causes the vacuum valve to open, allowing outside air into the cooling system. This equalizes the pressure in the cooling system with atmospheric pressure, thus preventing the radiator hoses from collapsing.
Surge Tank
The surge tank is a plastic tank with a pressure cap mounted to it. The tank is mounted at a point higher than all other coolant passages. The surge tank provides an air space in the cooling system. The air space allows the coolant to expand and contract. The surge tank also provides a coolant fill point and a central air bleed location.
During vehicle use, the coolant heats and expands. The coolant that is displaced by this expansion flows into the surge tank. As the coolant circulates, air is allowed to exit. This is an advantage to the cooling system. Coolant without bubbles absorbs heat much better than coolant with bubbles.
Air Baffles and Seals
The cooling system uses deflectors, air baffles and air seals to increase system cooling. Deflectors are installed under the vehicle to redirect airflow beneath the vehicle to flow through the radiator and increase cooling. Air baffles are also used to direct airflow into the radiator and increase cooling. Air seals prevent air from bypassing the radiator and A/C condenser. Air seals also prevent recirculation of the air for better hot weather cooling and A/C condenser performance.
Water Pump
The water pump is a centrifugal vane impeller type pump. The pump consists of a housing and an impeller. The impeller is a flat plate mounted on the pump shaft with a series of flat or curved blades or vanes. When the impeller rotates, the coolant between the vanes is thrown outward by centrifugal force. The impeller shaft is supported by one or more sealed bearings. The sealed bearings never need to be lubricated. Grease cannot leak out. Dirt and water cannot get in as long as the seal is not damaged or worn.
The purpose of the water pump is to circulate coolant throughout the cooling system. The water pump is driven by the crankshaft via the drive belt.
Thermostat
The thermostat is a coolant flow control component. Its purpose is to regulate the operating temperature of the engine. It has a temperature sensitive wax-pellet element. The element connects to a valve through a piston. When the element is heated, it expands and exerts pressure against a rubber diaphragm. This pressure forces the valve to open. As the element is cooled, it contracts. This contraction allows a spring to push the valve closed.
When the coolant temperature is below the rated thermostat opening temperature, the thermostat valve remains closed. This prevents circulation of the coolant to the radiator and allows the engine to warm up quickly. After the coolant temperature reaches rated thermostat opening temperature, the thermostat valve will open. The coolant is then allowed to circulate through the thermostat to the radiator where the engine heat is dissipated to the atmosphere. The thermostat also provides a restriction in the cooling system, even after it has opened. This restriction creates a pressure difference which prevents cavitation at the water pump and forces coolant to circulate through the engine block.
Engine Oil Heat Exchanger
The engine oil heat exchanger is mounted to the top of the engine block, under the intake manifold flange. Oil is pumped through the oil cooler inlet pipe to the heat exchanger, back through the oil cooler outlet pipe, and then to the oil passages in the engine for lubrication. The exchanger provides the following 2 functions
- Engine coolant warms up faster than the engine oil. During cold operation, the coolant warms the oil and provides better flow during cold engine operation.
- After the engine reaches normal operating temperature, the engine oil temperature will exceed the engine coolant temperature. The coolant flowing through the engine oil cooler will absorb heat from the engine oil. Cooling the engine oil extends oil life and helps reduce internal engine wear.
Transmission Oil Cooler-Two Fan System
| WARNING | The transmission oil cooler system uses quick connect fittings throughout the system. Use a special tool to disconnect these quick connect fittings. Removing the transmission oil cooler lines without this tool will result in damage to the radiator, the transmission, and the transmission oil cooler caused by mixing the transmission oil and coolant or due to transmission oil loss. |
The transmission oil cooler is a heat exchanger located in the bottom tank of the radiator. The transmission oil temperature is regulated by the temperature of the coolant leaving the radiator and passing over the heat exchanger. Lines from the transmission bring oil pumped at a high pressure to the cooler and back to the transmission.
Transmission Oil Cooler-Three Fan System
| WARNING | The transmission oil cooler system uses quick connect fittings throughout the system. Use a special tool to disconnect these quick connect fittings. Removing the transmission oil cooler lines without this tool will result in damage to the radiator, the transmission, and the transmission oil cooler caused by mixing the transmission oil and coolant or due to transmission oil loss. |
There are 2 transmission oil coolers in a series in the heavy duty transmission oil cooler system. The initial transmission oil cooler is a heat exchanger located in the bottom tank of the radiator. The transmission oil temperature is partially regulated by the temperature of the coolant leaving the radiator and passing over the heat exchanger. Lines from the transmission bring oil pumped at a high pressure to the cooler. The oil out of the cooler is plumbed to an air-to-oil cooler in front of the A/C condenser. This cooler provides additional cooling for heavy duty trailering. The transmission oil is then directed back to the transmission.
Transmission Oil Cooler Lines
| WARNING | The transmission oil cooler system uses quick connect fittings throughout the system. Use a special tool to disconnect these quick connect fittings. Removing the transmission oil cooler lines without this tool will result in damage to the radiator, the transmission, and the transmission oil cooler caused by mixing the transmission oil and coolant or due to transmission oil loss. |
The transmission oil cooler lines use quick connect fittings on the transmission oil cooler lines near the A/C compressor. The quick connect fittings must be removed using a special tool. The transmission oil cooler is an oil-to-air heat exchanger located between the A/C condenser and the radiator. The transmission oil temperature is regulated by the temperature of the air leaving the A/C condenser and passing over the heat exchanger. Lines from the transmission bring oil pumped at a high pressure to the cooler and back to the transmission. A thermal bypass valve is located external to the transmission where the transmission oil cooler lines connect to the transmission. This provides uninterrupted transmission oil flow for low ambient temperature conditions.
Power Steering Oil Cooler
Some vehicles are equipped with a power steering oil cooler located either between the radiator and condenser (Heavy Duty) or in front of the engine. This cooler transfers heat from the power steering system to the air passing through the condenser and radiator. The cooler uses constant tension clamps on the hose connections to the cooler.
| DTC | Description |
| DTC P0480 | Cooling Fan Relay 1 Control Circuit (w/LF1) |
| DTC P0480 | Cooling Fan Speed Output Circuit |
| DTC P0691 | Cooling Fan Speed Output Circuit Low Voltage |
| DTC P0692 | Cooling Fan Speed Output Circuit High Voltage (LAU) |
| DTC P0481 | Cooling Fan Relays 2 and 3 Control Circuit (w/LF1) |
| DTC P1258 | Engine Coolant Overtemperature - Protection Mode Active |
| DTC P2600 | Auxiliary Coolant Pump Relay Control Circuit |
| DTC P2601 | Auxiliary Coolant Pump Performance |
| DTC P2602 | Auxiliary Coolant Pump Relay Control Circuit Low Voltage |
| DTC P2603 | Auxiliary Coolant Pump Relay Control Circuit High Voltage |
KR20P COOL FAN 2 Relay
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480, P0481 | P0481 | | |
| Relay Switch B+ Circuit | (1) | (2) | | |
| Relay Control Circuit | P0481 | P0481 | P0481 | |
| Relay Controlled Output Circuit | (1) | (2) | (3) | |
| (1) Low and medium speed fan inoperative without a DTC. (2) Medium speed fan inoperative without a DTC. (3) Medium speed fan always ON without a DTC. |
| (1) | Low and medium speed fan inoperative without a DTC. |
| (2) | Medium speed fan inoperative without a DTC. |
| (3) | Medium speed fan always ON without a DTC. |
KR20C COOL FAN 3 Relay
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480 | (2) | | |
| Relay Switch B+ Circuit | (1) | (2) | | |
| Relay Control Circuit | (3) | (2) | (4) | |
| Relay Controlled Output Circuit | (1) | (2) | (3) | |
| (1) Low and medium speed fan inoperative without a DTC. (2) Low speed fan inoperative without a DTC. (3) Low speed fan always ON without a DTC. (4) Low and high speed fan inoperative without a DTC. |
| (1) | Low and medium speed fan inoperative without a DTC. |
| (2) | Low speed fan inoperative without a DTC. |
| (3) | Low speed fan always ON without a DTC. |
| (4) | Low and high speed fan inoperative without a DTC. |
KR20D COOL FAN 1 Relay
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480, P0481 | P0481 | (1) | |
| Relay Switch B+ Circuit | (2) | (2) | | |
| Relay Control Circuit | P0481 | P0481 | P0481 | |
| Relay Controlled Output Circuit | (2) | (2) | (3) | |
| (1) Medium speed fan replaced by high speed fan without a DTC. (2) High speed fan inoperative without a DTC. (3) High speed fan always ON without a DTC. |
| (1) | Medium speed fan replaced by high speed fan without a DTC. |
| (2) | High speed fan inoperative without a DTC. |
| (3) | High speed fan always ON without a DTC. |
KR20E COOL FAN 5 Relay
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480 | (1) | | |
| Relay Switch Ignition Circuit | P0480 | (1) | | |
| Relay Control Circuit | (2) | (1) | (3) | |
| Relay Controlled Output Circuit | P0480, P0481 | (1) | (4) | |
| (1) High speed fan inoperative without a DTC. (2) Low speed fan always ON without a DTC. (3) Low and high speed fan inoperative without a DTC. (4) Medium speed fan inoperative without a DTC. |
| (1) | High speed fan inoperative without a DTC. |
| (2) | Low speed fan always ON without a DTC. |
| (3) | Low and high speed fan inoperative without a DTC. |
| (4) | Medium speed fan inoperative without a DTC. |
KR20F COOL FAN 4 Relay
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480 | P0480 | | |
| Relay Switch Ignition Circuit | (1) | (2) | | |
| Relay Control Circuit | P0480 | P0480 | P0480 | |
| Relay Controlled Output Circuit | | (2) | | |
| (1) Low speed fan always ON without a DTC. (2) Low speed fan and high speed fan inoperative. |
| (1) | Low speed fan always ON without a DTC. |
| (2) | Low speed fan and high speed fan inoperative. |
Electrical Information Reference
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
Circuit/System Verification
- Ignition ON, observe the scan tool parameters listed below. Command the cooling fan ON and OFF with a scan tool. The parameters should display OK or Not Run in each of the commanded states. Cooling Fan Relay 1 Open Circuit Test Status Cooling Fan Relay 1 Low Voltage Test Status Cooling Fan Relay 1 High Voltage Test Status
- Engine on, check the DTC information with a scan tool. DTC U0480 should not be set.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Repair Instructions
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «RELAY REPLACEMENT (ATTACHED TO WIRE HARNESS)»(ref-652238-S26621542932014082300000) or «RELAY REPLACEMENT (WITHIN AN ELECTRICAL CENTER)»(ref-652238-S18364947252014082300000)
- «FRONT COMPARTMENT FUSE BLOCK REPLACEMENT»(ref-652238-S26207995302014082300000)
- «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for ECM replacement, setup, and programming
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- NOTE: There is a slight delay before the cooling fans activate. Ignition ON, command the cooling fan ON and OFF with a scan tool. The cooling fan should respond to the commanded states.
- Note the DTC information with a diagnostic tool. DTCs P0480, P0691 or P0692 should not set.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «ENGINE COOLANT FAN REPLACEMENT (LAU)»(ref-652237-S28071436062014082300000) or «ENGINE COOLANT FAN MOTOR REPLACEMENT (LF1)»(ref-652237-S09486572062014082300000)
- «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for ECM replacement, setup, and programming
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480, P0481 | P0481 | | |
| Relay Switch B+ Circuit | (1) | (2) | | |
| Relay Control Circuit | P0481 | P0481 | P0481 | |
| Relay Controlled Output Circuit | (1) | (2) | (3) | |
| (1) Low and medium speed fan inoperative without a DTC. (2) Medium speed fan inoperative without a DTC. (3) Medium speed fan always ON without a DTC. |
| (1) | Low and medium speed fan inoperative without a DTC. |
| (2) | Medium speed fan inoperative without a DTC. |
| (3) | Medium speed fan always ON without a DTC. |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480 | (2) | | |
| Relay Switch B+ Circuit | (1) | (2) | | |
| Relay Control Circuit | (3) | (2) | (4) | |
| Relay Controlled Output Circuit | (1) | (2) | (3) | |
| (1) Low and medium speed fan inoperative without a DTC. (2) Low speed fan inoperative without a DTC. (3) Low speed fan always ON without a DTC. (4) Low and high speed fan inoperative without a DTC. |
| (1) | Low and medium speed fan inoperative without a DTC. |
| (2) | Low speed fan inoperative without a DTC. |
| (3) | Low speed fan always ON without a DTC. |
| (4) | Low and high speed fan inoperative without a DTC. |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480, P0481 | P0481 | (1) | |
| Relay Switch B+ Circuit | (2) | (2) | | |
| Relay Control Circuit | P0481 | P0481 | P0481 | |
| Relay Controlled Output Circuit | (2) | (2) | (3) | |
| (1) Medium speed fan replaced by high speed fan without a DTC. (2) High speed fan inoperative without a DTC. (3) High speed fan always ON without a DTC. |
| (1) | Medium speed fan replaced by high speed fan without a DTC. |
| (2) | High speed fan inoperative without a DTC. |
| (3) | High speed fan always ON without a DTC. |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480 | (1) | | |
| Relay Switch Ignition Circuit | P0480 | (1) | | |
| Relay Control Circuit | (2) | (1) | (3) | |
| Relay Controlled Output Circuit | P0480, P0481 | (1) | (4) | |
| (1) High speed fan inoperative without a DTC. (2) Low speed fan always ON without a DTC. (3) Low and high speed fan inoperative without a DTC. (4) Medium speed fan inoperative without a DTC. |
| (1) | High speed fan inoperative without a DTC. |
| (2) | Low speed fan always ON without a DTC. |
| (3) | Low and high speed fan inoperative without a DTC. |
| (4) | Medium speed fan inoperative without a DTC. |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Relay Coil Ignition Circuit | P0480 | P0480 | | |
| Relay Switch Ignition Circuit | (1) | (2) | | |
| Relay Control Circuit | P0480 | P0480 | P0480 | |
| Relay Controlled Output Circuit | | (2) | | |
| (1) Low speed fan always ON without a DTC. (2) Low speed fan and high speed fan inoperative. |
| (1) | Low speed fan always ON without a DTC. |
| (2) | Low speed fan and high speed fan inoperative. |
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, observe the scan tool parameters listed below. Command the cooling fan ON and OFF with a scan tool. The parameters should display OK or Not Run in each of the commanded states. Cooling Fan Relay 2 and 3 Open Circuit Test Status Cooling Fan Relay 2 and 3 Low Voltage Test Status Cooling Fan Relay 2 and 3 High Voltage Test Status
- Engine on, check the DTC information with a scan tool. DTC U0481 should not be set.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «RELAY REPLACEMENT (ATTACHED TO WIRE HARNESS)»(ref-652238-S26621542932014082300000) or «RELAY REPLACEMENT (WITHIN AN ELECTRICAL CENTER)»(ref-652238-S18364947252014082300000)
- «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for ECM replacement, setup, and programming
LF1, LFW, LFX
- The engine is operating for greater than 30 seconds.
- DTC P1258 runs continuously once the conditions above have been met.
LAU
- DTCs P0116, P0117, P0118, P0119 are not set.
- The engine speed is higher than 80 RPM
- The engine is operating for greater than 30 seconds.
- DTC P1258 runs continuously once the conditions above have been met.
- The ECM detects that engine coolant temperature is warmer than 129°C (264°F) for greater than 2 seconds.
- if protection mode is activated and ECT detects that DTC(s) has/have been set then protection mode will remain activated for the new driving cycle until ETC detects that the DTC operation is running fault-free
The ECM detects that engine coolant temperature is warmer than 133°C (271°F) for greater than 1 second.
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
Note. If DTC P0480, P0481, P0691, P0692, P0693, or P0694 is set, diagnose that DTC first.
- Observe the engine coolant level. The engine coolant level should be within the operating range. See «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000)
- Ensure that the vehicle has the correct engine coolant with correct concentration and is not old, contaminated, or contains additives. See «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000)
- Inspect the cooling system for the following: Leaks Kinked or pinched hoses, especially at the radiator Loose, missing, or damaged radiator air seals or deflectors Air flow obstructions or bent fins at the radiator or the A/C condenser-Refer to «SYMPTOMS - ENGINE COOLING»(ref-652237-S30912293282014082300000) .
- NOTE: A small delay occurs before the ECM changes the cooling fan speed. Command the cooling fans ON and OFF, low and high speed. The engine cooling fans should turn ON and OFF with each command.
- If the cooling fans do not function as indicated, refer to «COOLING FAN INOPERATIVE (LAU)»(ref-652237-S17282920342014082300000) or «COOLING FAN INOPERATIVE (LF1, LFW, LFX)»(ref-652237-S42859070722014082300000) .
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, verify that DTC P0480, P0691, or P0692, is not set.
- If a DTC is set, refer to «DTC P0480: Cooling Fan Speed Output Circuit; DTC P0691: Cooling Fan Speed Output Circuit Low Voltage; DTC P0692: Cooling Fan Speed Output Circuit High Voltage (LAU)»(ref-652237-S17868079792014082300000) .
- NOTE: There is a slight delay before the cooling fan activates and reaches full speed. Command the cooling fan ON from 20-90 % with a scan tool. Verify that the cooling fan turns ON and operates as commanded.
- If the cooling fan does not respond to the commanded states, refer to «COOLING FAN INOPERATIVE (LAU)»(ref-652237-S17282920342014082300000) or «COOLING FAN INOPERATIVE (LF1)»(ref-652237-S42859070722014082300000) for further diagnosis.
- Ignition ON, command the KR31 auxiliary coolant pump relay ON and OFF with the scan tool. An audible click should be heard when changing between the commanded states.
- Start the engine. Check the DTC information with a diagnostic tool. DTC P2600, P2602, or P2603 should not set.
- Ignition ON, engine OFF, check the DTC information with a scan tool. DTC P2601 should not be set.
- If DTC P2601 is set, refer to the following procedures for further diagnosis: «AFTER BOIL COOLANT PUMP ALWAYS ON»(ref-652237-S08130744102014082300000) «AFTER BOIL COOLANT PUMP INOPERATIVE»(ref-652237-S32409059892014082300000) «AFTER BOIL COOLANT PUMP MALFUNCTION»(ref-652237-S24165695532014082300000)
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «FRONT COMPARTMENT FUSE BLOCK REPLACEMENT»(ref-652238-S26207995302014082300000)
- «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for ECM replacement, setup, and programming
Identifying Intermittent Conditions
Many intermittent conditions occur with harness or connector movement due to engine torque, rough pavement, vibration or physical movement of a component. Refer to the following for a list to help isolate an intermittent condition
- Moisture and water intrusion in connectors, terminals, and components
- Connector mating
- Terminal contact
- High circuit or component resistance. High resistance can include any resistance, regardless of the amount, which can interrupt the operation of the component.
- Harness' that are routed too tight, or chaffed circuits
- High or low ambient temperature
- High or low engine coolant temperatures
- High underhood temperatures
- Heat build up in component or circuit due to circuit resistance, poor terminal contact, or high electrical load
- High or low system voltage
- High vehicle load conditions
- Rough road surface
- Electro-magnetic interference (EMI)/circuit interference from relays, solenoids or other electrical surge
- Incorrect installation of non-factory, aftermarket, and after factory add on accessories
If an intermittent is detected, refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS for specific strategies in diagnosing intermittent conditions.
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition OFF, verify the radiator surge tank is filled to the correct level, with engine coolant.
- Ignition ON, check the scan tool Coolant Level Switch parameter. The parameter should display OK.
- Command the instrument cluster indicators ON and OFF with a scan tool. The low coolant indicator lamp should turn ON and OFF as commanded. Refer to «COOLING SYSTEM DESCRIPTION AND OPERATION»(ref-652237-S24746440362014082300000) .
- The low coolant indicator should be OFF with the engine coolant at the correct level.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «ENGINE COOLANT LEVEL INDICATOR MODULE REPLACEMENT»(ref-652237-S27743838062014082300000)
- «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for ECM replacement, setup, and programming
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0480, P0691, or P0692, is not set.
- If a DTC is set, refer to «DTC P0480, P0691 OR P0692 (LAU)»(ref-652237-S17868079792014082300000) .
- Ignition ON, observe the scan tool Cooling Fan Motor Command parameter. The parameter should display 0 %.
- Ignition ON, observe that the engine cooling fan is not operating.
- If the fan is operating, replace the K22 cooling fan control module.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «ENGINE COOLANT FAN REPLACEMENT (LAU)»(ref-652237-S28071436062014082300000) or «ENGINE COOLANT FAN REPLACEMENT (LF1, LFW OR LFX)»(ref-652237-S28071436062014082300000)
- «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000)
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0480 or P0481 is not set.
- If any cooling system DTCs are set, repair the DTC first. Refer to «DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE»(ref-652232-S23450649802014082300000) .
- Ignition ON, check the scan tool Cooling Fan Relay 1 and Cooling Fan Relays 2 and 3 Command parameters. The parameters should display OFF.
- Ignition ON, observe that the fan is not activated.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «RELAY REPLACEMENT (ATTACHED TO WIRE HARNESS)»(ref-652238-S26621542932014082300000) or «RELAY REPLACEMENT (WITHIN AN ELECTRICAL CENTER)»(ref-652238-S18364947252014082300000)
- «FRONT COMPARTMENT FUSE BLOCK REPLACEMENT»(ref-652238-S26207995302014082300000)
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, verify that DTC P0480, P0691, or P0692, is not set.
- If a DTC is set, refer to «DTC P0480, P0691 OR P0692 (LAU)»(ref-652237-S17868079792014082300000) .
- NOTE: There is a slight delay before the cooling fan activates and reaches full speed. Command the cooling fan ON with a scan tool. Verify that the cooling fan turns ON and operates at a high speed.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «ENGINE COOLANT FAN REPLACEMENT (LAU)»(ref-652237-S28071436062014082300000) or «ENGINE COOLANT FAN REPLACEMENT (LF1, LFW, LFX)»(ref-652237-S28071436062014082300000)
- «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000)
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0480 or P0481 is not set.
- If a DTC is set, refer to «DTC P0480 (w/LF1)»(ref-652237-S29223761112014082300000) or «DTC P0481 (w/LF1)»(ref-652237-S17014326972014082300000) .
- Command the cooling fan ON and OFF at low, medium, and high speed with a scan tool. The cooling fan should turn ON and OFF in each of the commanded states.
Cool Fan 5 Printed Circuit Board Relay
- Ignition OFF, disconnect the following cooling fan relays: KR20D Cool Fan 1 relay KR20C Cool Fan 3 relay
- Test for 190-230 ohms between Cool Fan 3 relay terminals 85 and 86 in the UBEC.
- If not within the specified range, replace the X50A UBEC.
- Measure the resistance between the Cool Fan 3 relay terminal 86 and Cool Fan 1 relay terminal 85 at the UBEC. The DMM should display OL.
- If less than the specified range, replace the X50A UBEC.
- Connect a 3 A fused jumper wire between ground and Cool Fan 3 relay terminal 85, at the UBEC.
- Ignition ON, verify a test lamp illuminates between ground and Cool Fan 1 relay terminal 85, at the UBEC.
- If the test lamp does not illuminate, replace the X50A UBEC.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «RELAY REPLACEMENT (ATTACHED TO WIRE HARNESS)»(ref-652238-S26621542932014082300000) or «RELAY REPLACEMENT (WITHIN AN ELECTRICAL CENTER)»(ref-652238-S18364947252014082300000)
- «ENGINE COOLANT FAN RESISTOR REPLACEMENT - RIGHT SIDE (LF1)»(ref-652237-S25103192182014082300000)
- «ENGINE COOLANT FAN RESISTOR REPLACEMENT - LEFT SIDE (LF1)»(ref-652237-S18133581832014082300000)
- «ENGINE COOLANT FAN MOTOR REPLACEMENT (LF1)»(ref-652237-S09486572062014082300000)
- «FRONT COMPARTMENT FUSE BLOCK REPLACEMENT»(ref-652238-S26207995302014082300000)
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, observe the DTC information with a scan tool. Verify that DTC P2600, P2602, or P2603 is not set.
- If any auxiliary coolant pump DTC is set, repair the DTC first. Refer to «DTC P2600-P2603»(ref-652237-S00756662092014082300000) .
- Ignition ON, observe the scan tool engine coolant temperature (ECT) sensor parameter. Verify the ECT is colder than 110 °C (230 °F).
- Observe that the pump is not activated.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
FRONT COMPARTMENT FUSE BLOCK REPLACEMENT
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
- Ignition ON, observe the DTC information with a scan tool. Verify that DTC P2600, P2602, or P2603 is not set.
- If any auxiliary coolant pump DTC is set, repair the DTC first. Refer to «DTC P2600-P2603»(ref-652237-S00756662092014082300000) .
- Ignition ON, command the auxiliary coolant pump relay ON and OFF with a scan tool. Verify that the pump turns ON and OFF when changing between the commanded states.
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «FRONT COMPARTMENT FUSE BLOCK REPLACEMENT»(ref-652238-S26207995302014082300000)
- «AUXILIARY WATER PUMP REPLACEMENT (LAU)»(ref-652237-S21547314202014082300000)
- Ignition ON, observe the DTC information with a scan tool. Verify that DTC P2600, P2602, or P2603 is not set.
- If any auxiliary coolant pump DTC is set, repair the DTC first. Refer to «DTC P2600-P2603»(ref-652237-S00756662092014082300000) .
- Ignition ON, command the Aux. Coolant Pump Relay ON and OFF with a scan tool. Verify that the G8 auxiliary coolant pump turns ON and OFF when changing between the commanded states.
- If the G8 pump does not activate, refer to «AFTER BOIL COOLANT PUMP INOPERATIVE»(ref-652237-S32409059892014082300000) .
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «AUXILIARY WATER PUMP REPLACEMENT (LAU)»(ref-652237-S21547314202014082300000)
- «AUXILIARY WATER PUMP INLET HOSE REPLACEMENT (LAU)»(ref-652237-S18547381842014082300000)
- «AUXILIARY WATER PUMP OUTLET HOSE REPLACEMENT (LAU)»(ref-652237-S36085389582014082300000)
Engine Overheating
| Step | Action | Yes | No |
| DEFINITION: The engine temperature lamp comes on and stays on, or temperature gauge shows hot, or coolant overflows from the surge tank onto the ground while the engine is running. |
| 1 | Check the condenser, radiator, and auxiliary coolers for any obstructions or bent fins that would prevent air flow through the radiator. Is there any airflow obstruction or bent fins? | Go to Step 2 | Go to Step 3 |
| 2 | Remove any debris that may cause an air flow obstruction. Remove or relocate aftermarket add-on components that block air flow to the radiator. Does the engine still overheat? | Go to Step 3 | System OK |
| 3 | Check for loose, missing, or damaged radiator air seals or deflectors. Are there any loose, missing, or damaged radiator air seals or deflectors? | Go to Step 4 | Go to Step 5 |
| 4 | Repair or replace any loose, missing, or damaged radiator air seals or deflectors. Does the engine still overheat? | Go to Step 5 | System OK |
| 5 | Check for an inoperative cooling fan. Refer to COOLING FAN INOPERATIVE (LAU) or COOLING FAN INOPERATIVE (LF1) . Is the thermostat operating properly? | Go to Step 6 | Go to Step 7 |
| 6 | Repair or replace the cooling fan(s) as necessary. Refer to ENGINE COOLANT FAN MOTOR REPLACEMENT (LF1) . Does the engine still overheat? | Go to Step 7 | System OK |
| 7 | Check for a loss of coolant. Refer to LOSS OF COOLANT . Does the engine still overheat? | Go to Step 8 | System OK |
| 8 | Check for kinked or pinched cooling hoses. Are any cooling hoses kinked or pinched? | Go to Step 9 | Go to Step 10 |
| 9 | Relieve any kinks by rerouting the hoses. Replace the hoses, if necessary. Does the engine still overheat? | Go to Step 10 | System OK |
| 10 | Using J-26568 Coolant and Battery Fluid Tester check the coolant concentration. Does the coolant concentration test correctly? | Go to Step 12 | Go to Step 11 |
| 11 | Replace the coolant, if necessary. Refer to LOSS OF COOLANT . Does the engine still overheat? | Go to Step 12 | System OK |
| 12 | Check for any blocked cooling system passages. Are there blocked cooling system passages? | Go to Step 13 | Go to Step 14 |
| 13 | Remove any obstructions by flushing the cooling system. Refer to FLUSHING . Does the engine still overheat? | Go to Step 14 | Go to Step 19 |
| 14 | Inspect the accessory drive belt tensioner. Refer to DRIVE BELT TENSIONER DIAGNOSIS . Does the engine still overheat? | Go to Step 15 | System OK |
| 15 | Check for a faulty thermostat. Refer to THERMOSTAT DIAGNOSIS . Does the engine still overheat? | Go to Step 16 | System OK |
| 16 | Replace the radiator. Refer to RADIATOR REPLACEMENT (LAU) or RADIATOR REPLACEMENT (LF1) . Does the engine still overheat? | Go to Step 17 | System OK |
| 17 | Check for a faulty water pump. The impeller blades may be eroded or broken. Is the water pump faulty? | Go to Step 18 | |
| 18 | Replace the water pump. Refer to WATER PUMP REPLACEMENT (LAU) or WATER PUMP REPLACEMENT (LF1) . Did you complete the repair? | Go to Step 19 | |
| 19 | Operate the system to verify the repair. Did you correct the condition? | System OK | |
Loss of Coolant
| Step | Action | Yes | No |
| DEFINITION: The cooling system is loosing coolant either internally or externally. |
| 1 | Were you sent here from Symptoms or another diagnostic table? | Go to Step 2 | Go to SYMPTOMS - ENGINE COOLING |
| 2 | Resolve any present DTCs. See DIAGNOSTIC SYSTEM CHECK - VEHICLE . Is the action complete? | Go to Step 3 | |
| 3 | Inspect the coolant level. Is the coolant at the proper level? | Go to Step 5 | Go to Step 4 |
| 4 | Fill the cooling system to the proper level. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Is the action complete? | Go to Step 5 | |
| 5 | Engine overheating can cause a loss of coolant. Is the engine overheating? | Go to Step 19 | Go to Step 6 |
| 6 | Allow the engine idle at normal operating temperature. Inspect for heavy white smoke coming out of the exhaust pipe. Is a heavy white smoke present from the exhaust pipe? | Go to Step 7 | Go to Step 8 |
| 7 | Coolant in the exhaust system creates a distinctive, burning coolant odor in the exhaust. Condensation in the exhaust system can cause an odorless white smoke during engine warm up. Does the white smoke have a burning coolant type odor? | Go to Step 20 | Go to Step 8 |
| 8 | Visually inspect the hoses, pipes and hose clamps. Are any of the hoses, clamps or pipes leaking? | Go to Step 21 | Go to Step 9 |
| 9 | Visually inspect the following components: Block heater Coolant pressure cap Core plugs Throttle body Engine block Intake manifold Radiator Thermostat housing Water pump Are any of the listed components leaking? | Go to Step 21 | Go to Step 10 |
| 10 | Pressure test the cooling system. Refer to COOLING SYSTEM LEAK TESTING . With the cooling system pressurized, visually inspect the components listed in steps 7, 8 and 9. Are any leaks present? | Go to Step 21 | Go to Step 11 |
| 11 | Pressure test the coolant pressure cap. Refer to PRESSURE CAP TESTING . Does the coolant pressure cap hold pressure? | Go to Step 12 | Go to Step 16 |
| 12 | Inspect for the following conditions: A coolant smell inside of the vehicle Coolant in the HVAC module drain tube Coolant on the vehicle floor covering near the HVAC module Is coolant present? | Go to Step 21 | Go to Step 13 |
| 13 | Inspect the underside of the engine oil fill cap for a gray/white milky substance. Is there a milky substance under the oil fill cap? | Go to Step 14 | Go to Step 15 |
| 14 | Inspect the engine oil fluid level indicator for a gray/white milky substance. Is there a milky substance on the engine oil fluid level indicator? | Go to Step 17 | Go to Step 15 |
| 15 | Inspect the automatic transmission oil fluid level indicator, if equipped, for a gray/white milky substance. Is there a milky substance on the automatic transmission fluid level indicator? | Go to Step 18 | Go to Step 22 |
| 16 | Replace the coolant pressure cap. Is the repair complete? | Go to Step 22 | |
| 17 | Replace the radiator. Refer to RADIATOR REPLACEMENT (LAU) or RADIATOR REPLACEMENT (LF1) . Replace the oil and filter. Refer to ENGINE OIL AND OIL FILTER REPLACEMENT (LAU) or ENGINE OIL AND OIL FILTER REPLACEMENT (LF1 OR LFW) Is the repair complete? | Go to Step 22 | |
| 18 | Replace the radiator. Refer to RADIATOR REPLACEMENT (LAU) or RADIATOR REPLACEMENT (LF1) . Service the automatic transmission. Refer to the following: ENGINE COOLANT/WATER IN TRANSMISSION . Is the repair complete? | Go to Step 22 | |
| 19 | Repair the engine overheating condition. Refer to ENGINE OVERHEATING . Is the repair complete? | Go to Step 22 | |
| 20 | Repair the engine internal coolant leak. Refer to COOLANT IN COMBUSTION CHAMBER or COOLANT IN ENGINE OIL . Is the repair complete? | Go to Step 22 | |
| 21 | Repair or replace the leaking component. Refer to the appropriate repair. Is the repair complete? | Go to Step 22 | |
| 22 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |
- «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
- «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
- «WIRING REPAIRS»(ref-652238-S13433242552014082300000)
Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.
- «ENGINE COOLANT HEATER REPLACEMENT (LF1)»(ref-652237-S19790026102014082300000) or «ENGINE COOLANT HEATER REPLACEMENT (LAU)»(ref-652237-S40434346742014082300000)
- «COOLANT HEATER CORD REPLACEMENT (LF1)»(ref-652237-S09738905532014082300000) or «COOLANT HEATER CORD REPLACEMENT (LAU)»(ref-652237-S37298117442014082300000)
Correction
- 01 - Replacement
- 02 - Removal - Refit
- 03 - Renovate
- 04 - Paint
- 05 - Adjust
- 06 - Change comp. unit
- 07 - Lubricate - Clean - Polish
- 08 - Check/Fault search
- 09 - Expose
- 10 - Install new
- 11 - Transfer
Radiator Cleaning
| WARNING | NEVER spray water on a hot heat exchanger. The resulting steam could cause personal injury. |
| WARNING | The heat exchanger fins are necessary for good heat transfer. Do not brush the fins. This may cause damage to the fins, reducing heat transfer. |
- NOTE: Remove bugs, leaves, dirt and other debris by blowing compressed air through the engine side of the radiator. Some conditions may require the use of warm water and a mild detergent.
- Clean the A/C condenser fins.
- Clean between the A/C condenser and radiator.
- Clean the radiator cooling fins.
- Straighten any damaged cooling fins.
Scheme 73
Scheme 73: Radiator Surge Tank Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Drain the coolant from the surge tank only. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Remove the battery tray. Refer to BATTERY TRAY REPLACEMENT . Remove the surge tank inlet hose. Refer to RADIATOR SURGE TANK INLET HOSE REPLACEMENT (LAU) or RADIATOR SURGE TANK INLET HOSE REPLACEMENT (LF1) . Remove the surge tank engine hose. Refer to RADIATOR SURGE TANK ENGINE HOSE REPLACEMENT (LAU) . Remove the surge tank outlet hose. Refer to RADIATOR SURGE TANK OUTLET HOSE REPLACEMENT (LAU) or RADIATOR SURGE TANK OUTLET HOSE REPLACEMENT (LF1) . |
| 1 | Radiator Surge Tank Clip |
| 2 | Radiator Surge Tank |
Scheme 74
Scheme 74: Radiator Surge Tank Replacement (LF1)
| Callout | Component Name |
| Preliminary Procedures Drain the coolant from the surge tank only. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Remove the battery tray. Refer to BATTERY TRAY REPLACEMENT . Remove the surge tank inlet hose. Refer to RADIATOR SURGE TANK INLET HOSE REPLACEMENT (LAU) or RADIATOR SURGE TANK INLET HOSE REPLACEMENT (LF1) . Remove the surge tank outlet hose. Refer to RADIATOR SURGE TANK OUTLET HOSE REPLACEMENT (LAU) or RADIATOR SURGE TANK OUTLET HOSE REPLACEMENT (LF1) . |
| 1 | Radiator Surge Tank Clip |
| 2 | Radiator Surge Tank |
Scheme 75
Scheme 75: Radiator Surge Tank Engine Hose Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Drain the coolant. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Remove the intake manifold cover. Refer to INTAKE MANIFOLD COVER REPLACEMENT . |
| 1 | Radiator Surge Tank Engine Hose Clamp (Qty: 2) Procedure Disengage tension on the radiator surge tank engine hose clamps using BO-38185 Hose Clamp Pliers. Special Tools BO-38185 Hose Clamp Pliers For equivalent regional tools, refer to SPECIAL TOOLS |
| 2 | Radiator Surge Tank Engine Hose |
Scheme 76
Scheme 76: Radiator Surge Tank Inlet Hose Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Partially drain the coolant. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . |
| 1 | Radiator Surge Tank Inlet Hose Clamp (Qty: 2) Procedure Disengage tension on the radiator surge tank inlet hose clamps using BO-38185 Hose Clamp Pliers. Special Tools BO-38185 Hose Clamp Pliers For equivalent regional tools, refer to SPECIAL TOOLS |
| 2 | Radiator Surge Tank Inlet Hose |
Scheme 77
Scheme 77: Radiator Surge Tank Inlet Hose Replacement (LF1)
| Callout | Component Name |
| Preliminary Procedures Partially drain the coolant. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Remove the intake manifold cover. Refer to INTAKE MANIFOLD COVER REPLACEMENT . |
| 1 | Radiator Surge Tank Inlet Hose Clamp (Qty: 2) Procedure Disengage tension on the radiator surge tank inlet hose clamps using BO-38185 Hose Clamp Pliers. Special Tools BO-38185 Hose Clamp Pliers For equivalent regional tools, refer to SPECIAL TOOLS |
| 2 | Radiator Surge Tank Inlet Hose |
Scheme 78
Scheme 78: Radiator Surge Tank Outlet Hose Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Drain the coolant. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Remove the battery tray. Refer to BATTERY TRAY REPLACEMENT Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . |
| 1 | Radiator Surge Tank Outlet Hose Clamp (Qty: 2) Procedure Disengage tension on the radiator surge tank outlet hose clamps using BO-38185 Hose Clamp Pliers. Special Tools BO-38185 Hose Clamp Pliers For equivalent regional tools, refer to SPECIAL TOOLS |
| 2 | Radiator Surge Tank Outlet Hose |
Scheme 79
Scheme 79: Radiator Surge Tank Outlet Hose Replacement (LF1)
| Callout | Component Name |
| Preliminary Procedures Drain the coolant. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Remove the fuel pipe shield. Refer to FUEL PIPE SHIELD REPLACEMENT . |
| 1 | Radiator Surge Tank Outlet Hose Clamp (Qty: 2) Procedure Disengage tension on the radiator surge tank outlet hose clamps using BO-38185 Hose Clamp Pliers. Special Tools BO-38185 Hose Clamp Pliers For equivalent regional tools, refer to SPECIAL TOOLS |
| 2 | Radiator Surge Tank Outlet Hose |
Scheme 80
Scheme 80: Radiator Inlet Hose Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Drain the cooling system. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) . Remove the charge air cooler outlet duct. Refer to CHARGE AIR COOLER OUTLET DUCT REPLACEMENT . Remove the auxiliary water pump outlet upper hose. Refer to AUXILIARY WATER PUMP OUTLET UPPER HOSE REPLACEMENT (LAU) . Remove the heater inlet hose. Refer to HEATER INLET HOSE REPLACEMENT (LF1) or HEATER INLET HOSE REPLACEMENT (LAU) . |
| 1 | Radiator Inlet Hose Clamp Procedure Disengage tension on the radiator inlet hose clamp using BO-38185 Hose Clamp Pliers. Special Tools BO-38185 Hose Clamp Pliers For equivalent regional tools, refer to SPECIAL TOOLS |
| 2 | Radiator Inlet Hose Connector |
| 3 | Radiator Inlet Hose |
Tools Required
EN 46104 Water Pump Pulley Holder
For equivalent regional tools, see SPECIAL TOOLS
Scheme 81
Scheme 81: Removal Procedure
Scheme 82
Scheme 83
- Drain the cooling system. Refer to «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000)
- Remove the generator drive belt. Refer to «DRIVE BELT REPLACEMENT»(ref-652231-S13574774562014082300000)
- Use the EN 46104 Water pump pulley holder to retain the pulley.
- Remove the water pump pulley bolts.
- Remove the water pump pulley.
- Remove the water pump bolts.
- Remove the water pump.
- Remove and DISCARD the water pump seal.
- Carefully clean the water pump sealing surfaces.
Scheme 84
Scheme 84: Installation Procedure
Scheme 85
Scheme 86
Scheme 87
- Install a NEW water pump seal.
- Install the water pump.
- Refer to «CAUTION: RETAINER»(ref-652229-S20487768742014082300000) Install the water pump bolts and tighten in sequence to 12 Nm (106 lb in) .
- Tighten the water pump bolts a 2nd time in sequence to 12 Nm (106 lb in) .
- Install the water pump pulley and the water pump pulley bolts.
- Use the EN 46104 Water pump pulley holder to hold the pulley.
- Install the water pump pulley bolts and tighten to 12 Nm (108 lb in) .
- Install the generator drive belt. Refer to «DRIVE BELT REPLACEMENT»(ref-652231-S13574774562014082300000) .
- Fill the cooling system. Refer to «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000)
Scheme 88
Scheme 88: Auxiliary Water Pump Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Drain the cooling system. Refer to COOLING SYSTEM DRAINING AND FILLING (GE 47716) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU) or COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1) Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE Remove the auxiliary water pump outlet hose. Refer to AUXILIARY WATER PUMP OUTLET HOSE REPLACEMENT (LAU) Remove the auxiliary water pump inlet hose. Refer to AUXILIARY WATER PUMP INLET HOSE REPLACEMENT (LAU) Disconnect electrical connector from auxiliary water pump. |
| 1 | Auxiliary Water Pump Bolts (Qty 2) Refer to CAUTION: RETAINER Tighten 12 Nm (8 lb ft) |
| 2 | Auxiliary Water Pump |
Scheme 89
Scheme 89: Radiator Drain Cock Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE Remove the radiator air lower deflector. Refer to RADIATOR AIR LOWER DEFLECTOR REPLACEMENT Place a drain pan under the left side lower radiator mount. |
| 1 | Radiator Drain Cock |
Scheme 90
Scheme 90: Radiator Drain Cock Replacement (LF1)
| Callout | Component Name |
| Preliminary Procedures Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE Remove the radiator air lower deflector. Refer to RADIATOR AIR LOWER DEFLECTOR REPLACEMENT Place a drain pan under the right side lower radiator mount. |
| 1 | Radiator Drain Cock |
Scheme 91
Scheme 91: Removal Procedure
Scheme 92
- Drain the cooling system. Refer to «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000) .
- Remove the front bumper fascia. Refer to «FRONT BUMPER FASCIA REPLACEMENT»(ref-652246-S16212509752014082300000) .
- Remove the front compartment front sight shield. Refer to «FRONT COMPARTMENT FRONT SIGHT SHIELD REPLACEMENT»(ref-652252-S22527087942014082300000) .
- Remove the primary latch bracket. Refer to «HOOD PRIMARY LATCH BRACKET REPLACEMENT»(ref-652252-S12070705782014082300000) .
- Remove the cooling fan and shroud. Refer to «COOLING FAN AND SHROUD REPLACEMENT (LAU)»(ref-652237-S05481741742014082300000) or «COOLING FAN AND SHROUD REPLACEMENT (LF1)»(ref-652237-S24990189232014082300000) .
- Remove the radiator air upper seal. Refer to «RADIATOR AIR UPPER SEAL REPLACEMENT»(ref-652237-S27013838362014082300000) .
- Remove the radiator air lower seal. Refer to «RADIATOR AIR LOWER SEAL REPLACEMENT»(ref-652237-S21274081382014082300000) .
- Remove the radiator air side seal. Refer to «RADIATOR AIR SEAL REPLACEMENT»(ref-652237-S18122595932014082300000) .
- Remove the radiator air side baffles. Refer to «RADIATOR AIR SIDE BAFFLE REPLACEMENT - LEFT SIDE»(ref-652237-S09661511932014082300000) and «RADIATOR AIR SIDE BAFFLE REPLACEMENT - RIGHT SIDE»(ref-652237-S19190228742014082300000) .
- Remove the air conditioner condenser. Refer to «AIR CONDITIONING CONDENSER REPLACEMENT (LF1)»(ref-652243-S17772398992014082300000) or «AIR CONDITIONING CONDENSER REPLACEMENT (LAU)»(ref-652243-S09894059562014082300000) .
- Remove the charge air cooler. Refer to «CHARGE AIR COOLER REPLACEMENT (LAU)»(ref-652237-S25955559892014082300000) .
- Remove the radiator inlet hose. Refer to «RADIATOR INLET HOSE REPLACEMENT (LAU)»(ref-652237-S22753593302014082300000) or «RADIATOR INLET HOSE REPLACEMENT (LF1)»(ref-652237-S36695928992014082300000) .
- Remove the radiator outlet hose. Refer to «RADIATOR OUTLET HOSE REPLACEMENT (LAU)»(ref-652237-S16568666752014082300000) or «RADIATOR OUTLET HOSE REPLACEMENT (LF1)»(ref-652237-S08681500392014082300000) .
- Remove the radiator upper support bracket bolts (1).
- Remove the radiator upper support brackets (2).
- Remove the radiator (1) from the vehicle.
Scheme 93
Scheme 93: Installation Procedure
Scheme 94
- Install the radiator (1) to the vehicle.
- Install the radiator upper support brackets (2).
- Refer to «CAUTION: RETAINER»(ref-652229-S20487768742014082300000) Install the radiator upper support bracket bolts (1) and tighten to 9 Nm (80 lb in) .
- Install the radiator outlet hose. Refer to «RADIATOR OUTLET HOSE REPLACEMENT (LAU)»(ref-652237-S16568666752014082300000) or «RADIATOR OUTLET HOSE REPLACEMENT (LF1)»(ref-652237-S08681500392014082300000) .
- Install the radiator inlet hose. Refer to «RADIATOR INLET HOSE REPLACEMENT (LAU)»(ref-652237-S22753593302014082300000) or «RADIATOR INLET HOSE REPLACEMENT (LF1)»(ref-652237-S36695928992014082300000) .
- Install the charge air cooler. Refer to «CHARGE AIR COOLER REPLACEMENT (LAU)»(ref-652237-S25955559892014082300000) .
- Install the air conditioning condenser. Refer to «AIR CONDITIONING CONDENSER REPLACEMENT (LF1)»(ref-652243-S17772398992014082300000) or «AIR CONDITIONING CONDENSER REPLACEMENT (LAU)»(ref-652243-S09894059562014082300000) .
- Install the radiator air side baffles. Refer to «RADIATOR AIR SIDE BAFFLE REPLACEMENT - LEFT SIDE»(ref-652237-S09661511932014082300000) and «RADIATOR AIR SIDE BAFFLE REPLACEMENT - RIGHT SIDE»(ref-652237-S19190228742014082300000) .
- Install the radiator air side seal. Refer to «RADIATOR AIR SEAL REPLACEMENT»(ref-652237-S18122595932014082300000) .
- Install the radiator air lower seal. Refer to «RADIATOR AIR LOWER SEAL REPLACEMENT»(ref-652237-S21274081382014082300000) .
- Install the radiator air upper seal. Refer to «RADIATOR AIR UPPER SEAL REPLACEMENT»(ref-652237-S27013838362014082300000) .
- Install the cooling fan and shroud. Refer to «COOLING FAN AND SHROUD REPLACEMENT (LAU)»(ref-652237-S05481741742014082300000) or «COOLING FAN AND SHROUD REPLACEMENT (LF1)»(ref-652237-S24990189232014082300000) .
- Install the primary latch bracket. Refer to «HOOD PRIMARY LATCH BRACKET REPLACEMENT»(ref-652252-S12070705782014082300000) .
- Install the front compartment front sight shield. Refer to «FRONT COMPARTMENT FRONT SIGHT SHIELD REPLACEMENT»(ref-652252-S22527087942014082300000) .
- Install the front bumper fascia. Refer to «FRONT BUMPER FASCIA REPLACEMENT»(ref-652246-S16212509752014082300000) .
- Fill the cooling system. Refer to «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000) .
Scheme 95
Scheme 95: Removal Procedure
Scheme 96
- Drain the cooling system. Refer to «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000) .
- Remove the front bumper fascia. Refer to «FRONT BUMPER FASCIA REPLACEMENT»(ref-652246-S16212509752014082300000)
- Remove the front compartment front sight shield. Refer to «FRONT COMPARTMENT FRONT SIGHT SHIELD REPLACEMENT»(ref-652252-S22527087942014082300000)
- Remove the primary latch bracket. Refer to «HOOD PRIMARY LATCH BRACKET REPLACEMENT»(ref-652252-S12070705782014082300000)
- Remove the cooling fan and shroud. Refer to «COOLING FAN AND SHROUD REPLACEMENT (LAU)»(ref-652237-S05481741742014082300000) or «COOLING FAN AND SHROUD REPLACEMENT (LF1)»(ref-652237-S24990189232014082300000)
- Remove the radiator air upper seal. Refer to «RADIATOR AIR UPPER SEAL REPLACEMENT»(ref-652237-S27013838362014082300000)
- Remove the radiator air lower seal. Refer to «RADIATOR AIR LOWER SEAL REPLACEMENT»(ref-652237-S21274081382014082300000)
- Remove the radiator air side seal. Refer to «RADIATOR AIR SEAL REPLACEMENT»(ref-652237-S18122595932014082300000)
- Remove the radiator air side baffles. Refer to «RADIATOR AIR SIDE BAFFLE REPLACEMENT - LEFT SIDE»(ref-652237-S09661511932014082300000) and «RADIATOR AIR SIDE BAFFLE REPLACEMENT - RIGHT SIDE»(ref-652237-S19190228742014082300000)
- Remove the air conditioner condenser. Refer to «AIR CONDITIONING CONDENSER REPLACEMENT (LF1)»(ref-652243-S17772398992014082300000) or «AIR CONDITIONING CONDENSER REPLACEMENT (LAU)»(ref-652243-S09894059562014082300000)
- Remove the radiator inlet hose. Refer to «RADIATOR INLET HOSE REPLACEMENT (LAU)»(ref-652237-S22753593302014082300000) or «RADIATOR INLET HOSE REPLACEMENT (LF1)»(ref-652237-S36695928992014082300000)
- Remove the radiator outlet hose. Refer to «RADIATOR OUTLET HOSE REPLACEMENT (LAU)»(ref-652237-S16568666752014082300000) or «RADIATOR OUTLET HOSE REPLACEMENT (LF1)»(ref-652237-S08681500392014082300000)
- Remove the radiator upper support bracket bolts (1).
- Remove the radiator upper support brackets (2).
- Remove the radiator (1) from the vehicle.
Scheme 97
Scheme 97: Installation Procedure
Scheme 98
- Install the radiator (1) to the vehicle.
- Install the radiator upper support brackets (2).
- Refer to «CAUTION: RETAINER»(ref-652229-S20487768742014082300000) Install the radiator upper support bracket bolts (1) and tighten to 9 Nm (80 lb in) .
- Install the radiator outlet hose. Refer to «RADIATOR OUTLET HOSE REPLACEMENT (LAU)»(ref-652237-S16568666752014082300000) or «RADIATOR OUTLET HOSE REPLACEMENT (LF1)»(ref-652237-S08681500392014082300000)
- Install the radiator inlet hose. Refer to «RADIATOR INLET HOSE REPLACEMENT (LAU)»(ref-652237-S22753593302014082300000) or «RADIATOR INLET HOSE REPLACEMENT (LF1)»(ref-652237-S36695928992014082300000)
- Install the air conditioning condenser. Refer to «AIR CONDITIONING CONDENSER REPLACEMENT (LF1)»(ref-652243-S17772398992014082300000) or «AIR CONDITIONING CONDENSER REPLACEMENT (LAU)»(ref-652243-S09894059562014082300000)
- Install the radiator air side baffles. Refer to «RADIATOR AIR SIDE BAFFLE REPLACEMENT - LEFT SIDE»(ref-652237-S09661511932014082300000) and «RADIATOR AIR SIDE BAFFLE REPLACEMENT - RIGHT SIDE»(ref-652237-S19190228742014082300000)
- Install the radiator air side seal. Refer to «RADIATOR AIR SEAL REPLACEMENT»(ref-652237-S18122595932014082300000)
- Install the radiator air lower seal. Refer to «RADIATOR AIR LOWER SEAL REPLACEMENT»(ref-652237-S21274081382014082300000)
- Install the radiator air upper seal. Refer to «RADIATOR AIR UPPER SEAL REPLACEMENT»(ref-652237-S27013838362014082300000)
- Install the cooling fan and shroud. Refer to «COOLING FAN AND SHROUD REPLACEMENT (LAU)»(ref-652237-S05481741742014082300000) or «COOLING FAN AND SHROUD REPLACEMENT (LF1)»(ref-652237-S24990189232014082300000)
- Install the primary latch bracket. Refer to «HOOD PRIMARY LATCH BRACKET REPLACEMENT»(ref-652252-S12070705782014082300000)
- Install the front compartment front sight shield. Refer to «FRONT COMPARTMENT FRONT SIGHT SHIELD REPLACEMENT»(ref-652252-S22527087942014082300000)
- Install the front bumper fascia. Refer to «FRONT BUMPER FASCIA REPLACEMENT»(ref-652246-S16212509752014082300000)
- Fill the cooling system. Refer to «COOLING SYSTEM DRAINING AND FILLING (GE 47716)»(ref-652237-S23590170992014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LAU)»(ref-652237-S36839240752014082300000) or «COOLING SYSTEM DRAINING AND FILLING (STATIC FILL LF1)»(ref-652237-S01219592032014082300000) .
Scheme 99
Scheme 99: Radiator Air Side Baffle Replacement - Left Side
| Callout | Component Name |
| Preliminary Procedures Remove the front bumper fascia. See FRONT BUMPER FASCIA REPLACEMENT |
| 1 | Radiator Air Side Baffle And Deflector Retainers (Qty 3) |
| 2 | Radiator Air Side Baffle And Deflector Left |
Scheme 100
Scheme 100: Radiator Air Side Baffle Replacement - Right Side
| Callout | Component Name |
| Preliminary Procedures Remove the front bumper fascia. See FRONT BUMPER FASCIA REPLACEMENT |
| 1 | Radiator Air Side Baffle And Deflector Retainers (Qty 3) |
| 2 | Radiator Air Side Baffle And Deflector Right |
Scheme 101
Scheme 101: Radiator Air Seal Replacement
| Callout | Component Name |
| Preliminary Procedures Remove the front bumper fascia. Refer to FRONT BUMPER FASCIA REPLACEMENT Unbolt and reposition the air conditioning condenser. Refer to AIR CONDITIONING CONDENSER REPLACEMENT (LF1) or AIR CONDITIONING CONDENSER REPLACEMENT (LAU) |
| 1 | Radiator Air Seal Retainers (Qty 4) |
| 2 | Radiator Air Seal |
Scheme 102
Scheme 102: Radiator Air Upper Seal Replacement
| Callout | Component Name |
| Preliminary Procedures Remove the front bumper fascia upper support. Refer to FRONT BUMPER FASCIA UPPER SUPPORT REPLACEMENT |
| 1 | Radiator Air Upper Seal Retainers (Qty 8) |
| 2 | Radiator Air Upper Seal |
Scheme 103
Scheme 103: Radiator Air Lower Seal Replacement
| Callout | Component Name |
| Preliminary Procedures Remove the radiator air lower deflector. Refer to RADIATOR AIR LOWER DEFLECTOR REPLACEMENT |
| 1 | Radiator Air Lower Seal Retainers (Qty 4) |
| 2 | Radiator Air Lower Seal |
Scheme 104
Scheme 104: Engine Coolant Heater Replacement (LF1)
| Callout | Component Name |
| Preliminary Procedures Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . |
| 1 | Coolant Heater NOTE: Be careful not to score inner surface of the engine block when removing coolant heater. |
| NOTE |
| Be careful not to score inner surface of the engine block when removing coolant heater. |
Scheme 105
Scheme 105: Engine Coolant Heater Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . |
| 1 | Engine Coolant Heater Connector |
| 2 | Engine Coolant Heater |
Scheme 106
Scheme 106: Coolant Heater Cord Replacement (LF1)
| Callout | Component Name |
| Preliminary Procedures Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . |
| 1 | Retainer Refer to CAUTION: RETAINER . |
| 2 | Coolant Heater Cord |
Scheme 107
Scheme 107: Coolant Heater Cord Replacement (LAU)
| Callout | Component Name |
| Preliminary Procedures Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . |
| 1 | Engine Coolant Heater Connector |
| 2 | Engine Coolant Heater Cord |
Scheme 108
Scheme 108: Cooling Fan (LF1)
Scheme 109
Scheme 109: Cooling System (LAU)