Precaution for Cooling System
| WARNING | If the radiator cap is removed while the engine is hot and pressure is high, the inside coolant will instantaneously boil up and spew out. This could cause severe burns or could cause a fire if coolant is splashed over the hot engine and fenders, as the coolant contains a flammable anti-freeze material. Never check the coolant level or add coolant by removing the radiator cap. Instead, be sure to check the coolant level only on the coolant reservoir and, if necessary, add coolant to the reservoir. Also, make sure that the engine coolant temperature is cold before removing any part of cooling system. If service operations are performed on the engine cooling system with the battery connected, there is a risk of injury by accidental movement of the radiator cooling fan or other electric components. Be sure to disconnect the negative cable from the battery terminal before performing any service operations on the engine cooling system. |
A/C switch: OFF
Note. The following table indicates cooling fan operation while engine is running at 1,250 RPM. It depends on engine revolution to determine temperature for changing proper fan motor speed.
Scheme 25
A/C switch: ON
Note. It depends on engine revolution to determine temperature for changing proper fan motor speed.
Low speed
Cooling fan operates at low speed when A/C refrigerant pressure is more than specified value 1.5 MPa (15.3 kgf/cm 2 , 218 psi).
High speed
Cooling fan speed changes at high speed from low when A/C refrigerant pressure is more than specified value 1.8 MPa (18.4 kgf/cm 2 , 261 psi).
Fail-safe
Cooling fan operates high speed on condition that malfunction is detected in ECT sensor.
Coolant Circulation
While the engine is warmed up (thermostat closed), coolant circulates as follows.
Scheme 26
When coolant is warmed up to normal temperature and the thermostat opens, coolant passes through the radiator core to be cooled as follows.
Scheme 27
Scheme 28
Coolant Level Check
| WARNING | To avoid getting burned, do not remove radiator cap while engine and radiator are still hot. Scalding fluid and steam can gush out under pressure if cap is taken off too soon. |
To check level, lift hood and look at "see-through" coolant reservoir.
It is not necessary to remove radiator cap to check coolant level.
When engine is cool, check coolant level in reservoir (1).
A normal coolant level should be between FULL mark (2) and LOW mark (3) on reservoir (1).
If coolant level is below LOW mark (3), remove reservoir cap (4) and add proper coolant to reservoir to bring coolant level up to FULL mark (2).
Note. If proper quality antifreeze is used, there is no need to add extra inhibitors or additives that claim to improve system. They may be harmful to proper operation of system, and are unnecessary expense.
Scheme 29
| WARNING | If the radiator cap is removed when the engine and radiator are still hot, extremely hot fluid and steam may spew out under pressure. This can cause severe burns. Wait until the engine coolant temperature has lowered before removing the radiator cap. |
Scheme 30
- Check cooling system for leakage or damage.
- Remove radiator cap, see «Radiator Cap Removal and Installation»(ref-514579-S32418569342012112100000) .
- Check coolant for proper level and freeze protection.
- Check coolant leaks from cooling system according to the following procedure. Attach pressure tester (1) to water filler, and then apply specified pressure to cooling system. Cooling system holding pressure 110 kPa (1.1 kgf/cm 2 , 15.9 psi) Check that cooling system holds the pressure. If cooling system does not hold applied pressure, Check cooling system for coolant leaks.
- Check radiator cap according to the following procedure. Attach pressure tester (1) to radiator cap (2), and then apply specified pressure. Radiator cap holding pressure 108 kPa (1.1 kgf/cm 2 , 15.6 psi) Check that radiator cap holds applied pressure. If the pressure at which radiator cap releases air is higher or lower than holding pressure, replace radiator cap.
- Detach pressure tester and rinse off spilled coolant.
- Install radiator cap on water filler, see «Radiator Cap Removal and Installation»(ref-514579-S32418569342012112100000) .
Cleaning
Clean frontal area of radiator cores.
