Engine Cooling System: Removal & Installation Chevrolet TrailBlazer I рестайлинг

Removal Procedure

1. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(ref-277758-S09340530442008011800000) for the 4.2L engine or Air Cleaner Assembly Replacement for the 5.3L engine or Air Cleaner Assembly Replacement for the 6.0L engine.
2. Remove the accumulator. Refer to «Accumulator Replacement»(ref-277731-S40848075082008011800000) .
3. Remove the coolant hoses from the coolant recovery reservoir and plug the hoses and the coolant recovery reservoir outlets with suitable plugs (2).
4. Remove the nut and bolt securing the coolant recovery reservoir.
5. Remove the coolant recovery reservoir.

Installation Procedure

1. Install the coolant recovery reservoir.
2. Install the coolant recovery reservoir bolt. Tighten: Tighten the bolt to 12 N.m (106 lb in).
3. Install the coolant recovery reservoir nut. Tighten: Tighten the nut to 10 N.m (89 lb in).
4. Install the coolant hose to the coolant recovery reservoir (2).
5. Install the accumulator. Refer to «Accumulator Replacement»(ref-277731-S40848075082008011800000) .
6. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(ref-277758-S09340530442008011800000) for the 4.2L engine, Air Cleaner Assembly Replacement for the 5.3L engine or Air Cleaner Assembly Replacement for the 6.0L engine.

1. Drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the air intake resonator. Refer to Air Cleaner Resonator Outlet Duct Replacement for the 5.3L engine or Air Cleaner Resonator Outlet Duct Replacement for the 6.0L engine.
3. Using J 38185 reposition the radiator inlet hose clamp (1) from the engine. See «Special Tools»(ref-277788-S20027075962008011800000) .
4. Remove the outlet hose from the engine.
5. Using J 38185 reposition the radiator inlet hose clamp (2) from the radiator. See «Special Tools»(ref-277788-S20027075962008011800000) .
6. Remove the radiator outlet hose from the radiator.

1. Install the inlet hose to the radiator.
2. Using J 38185 reposition the radiator inlet hose clamp to the radiator. See «Special Tools»(ref-277788-S20027075962008011800000) .
3. Install the inlet hose to the engine.
4. Using J 38185 reposition the radiator inlet hose clamp to the engine. See «Special Tools»(ref-277788-S20027075962008011800000) .
5. Install the air intake resonator. Refer to Air Cleaner Resonator Outlet Duct Replacement for the 5.3L engine or Air Cleaner Resonator Outlet Duct Replacement for the 6.0L engine.
6. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the air cleaner outlet resonator. Refer to «Air Cleaner Outlet Resonator Replacement»(ref-277758-S10118719822008011800000) .
3. Using J 38185 reposition the radiator inlet hose clamp (1) from the engine. See «Special Tools»(ref-277788-S20027075962008011800000) .
4. Remove the radiator outlet hose from the engine.
5. Using J 38185 reposition the radiator inlet hose clamp (2) from the radiator. See «Special Tools»(ref-277788-S20027075962008011800000) .
6. Remove the radiator inlet hose from the radiator.

1. Install the radiator inlet hose to the radiator.
2. Using J 38185 reposition the radiator inlet hose clamp to the radiator. See «Special Tools»(ref-277788-S20027075962008011800000) .
3. Install the radiator inlet hose to the engine.
4. Using J 38185 reposition the radiator inlet hose clamp to the engine. See «Special Tools»(ref-277788-S20027075962008011800000) .
5. Install the air cleaner outlet resonator. Refer to «Air Cleaner Outlet Resonator Replacement»(ref-277758-S10118719822008011800000) .
6. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Using J 38185 reposition the radiator outlet hose clamp (3). See «Special Tools»(ref-277788-S20027075962008011800000) .
3. Remove the radiator outlet hose (2) from the radiator.
4. Using J 38185 reposition the radiator outlet hose clamp. See «Special Tools»(ref-277788-S20027075962008011800000) .
5. Remove the radiator outlet hose from the engine (5).
6. Remove the radiator outlet hose.

1. Install the radiator outlet hose to the engine (5).
2. Using J 38185 reposition the radiator outlet hose clamp (3). See «Special Tools»(ref-277788-S20027075962008011800000) .
3. Install the radiator outlet hose (2) to the radiator (1).
4. Using J 38185 reposition the radiator outlet hose clamp (3). See «Special Tools»(ref-277788-S20027075962008011800000) .
5. Lower the vehicle.
6. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Using J 38185 reposition the radiator outlet hose clamp. See «Special Tools»(ref-277788-S20027075962008011800000) .
3. Remove the radiator outlet hose from the radiator.
4. Using J 38185 reposition the radiator outlet hose clamp. See «Special Tools»(ref-277788-S20027075962008011800000) .
5. Remove the radiator outlet hose from the engine (1).
6. Remove the radiator outlet hose.

1. Install the radiator outlet hose to the engine (1).
2. Using J 38185 reposition the radiator outlet hose clamp. See «Special Tools»(ref-277788-S20027075962008011800000) .
3. Install the radiator outlet hose to the radiator.
4. Using J 38185 reposition the radiator outlet hose clamp. See «Special Tools»(ref-277788-S20027075962008011800000) .
5. Lower the vehicle.
6. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Partially drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the vent inlet hose from the radiator.
3. Remove the vent inlet hose from the surge tank.

1. Install the vent inlet hose to the surge tank.
2. Install the vent inlet hose to the radiator.
3. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Remove the cooling fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .
2. Remove the push-pin and release the fan clutch electrical connector from the fan shroud.
3. Remove the fan clutch from the fan shroud.
4. Remove the bolts retaining the fan blade to the fan clutch.
5. Separate the fan blade from the fan clutch.

1. Assemble the fan blade to the fan clutch.
2. Install the 4 bolts to the fan blade. Tighten: Tighten the bolts to 27 N.m (20 lb ft).
3. Install the fan clutch to the fan shroud.
4. Install the push-pin to the fan clutch electrical connector.
5. Install the cooling fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .

1. Drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(ref-277758-S09340530442008011800000) for the 4.2L engine, Air Cleaner Assembly Replacement for the 5.3L engine or Air Cleaner Assembly Replacement for the 6.0L engine.
3. Remove the air resonator assembly. Refer to «Air Cleaner Outlet Resonator Replacement»(ref-277758-S10118719822008011800000) for the 4.2L engine, Air Cleaner Resonator Outlet Duct Replacement for the 5.3L engine or Air Cleaner Resonator Outlet Duct Replacement for the 6.0L engine.
4. Remove the inlet radiator hose. Refer to «Radiator Inlet Hose Replacement (LH6, LS2)»(ref-277788-S37170660232008011800000) or «Radiator Inlet Hose Replacement (LL8)»(ref-277788-S13018982972008011800000) .
5. Remove the transmission oil cooler lines from the fan shroud.
6. Disconnect the fan clutch electrical connector.
7. Using J 46406 remove the fan clutch from the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
8. Remove the mounting bolts from the upper fan shroud.
9. Lift and push the fan shroud inward to clear the filler neck on the radiator.
10. Remove the fan and the shroud.

1. Install the fan and the shroud.
2. Install the mounting bolts to the upper fan shroud. Tighten: Tighten the bolts to 28 N.m (21 lb ft).
3. Using J 46406 install the fan clutch to the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
4. Connect the fan clutch electrical connector.
5. Install the transmission oil cooler lines to the fan shroud.
6. Install the inlet radiator hose. Refer to «Radiator Inlet Hose Replacement (LH6, LS2)»(ref-277788-S37170660232008011800000) or «Radiator Inlet Hose Replacement (LL8)»(ref-277788-S13018982972008011800000) .
7. Install the air resonator assembly. Refer to «Air Cleaner Outlet Resonator Replacement»(ref-277758-S10118719822008011800000) for the 4.2L engine, Air Cleaner Resonator Outlet Duct Replacement for the 5.3L engine or Air Cleaner Resonator Outlet Duct Replacement for the 6.0L engine.
8. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(ref-277758-S09340530442008011800000) for the 4.2L engine or Air Cleaner Assembly Replacement for the 5.3L engine or Air Cleaner Assembly Replacement for the 6.0L engine.
9. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Remove the underhood electrical center cover.
2. Using the J 43244 , remove the cooling fan relay (3).

Note. Installation of the proper relay is critical. If an enhanced relay - equipped with a diode - is installed into a position requiring a standard relay - equipped without a diode - excessive current will damage any components associated with the relay or its associated circuits.

1. Install the cooling fan relay (3).
2. Install the underhood electrical center cover.

1. Remove the necessary coolant from the radiator. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the generator. Refer to «Generator Replacement (4.2L Engine)»(ref-277744-S36703100462008011800000) or «Generator Replacement (5.3L and 6.0L Engines)»(ref-277744-S28084668882008011800000) .
3. Loosen the outlet hose clamp at the thermostat housing (1). Remove the outlet hose from the thermostat housing.
4. Remove the thermostat housing bolts.
5. Remove the thermostat housing from the engine block.
6. Clean all of the surfaces of the thermostat housing.
7. Clean the sealing surface of the engine block.

1. Install the thermostat housing to the engine block.
2. Install the thermostat housing bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in).
3. Lubricate the inner diameter of the radiator hose with engine coolant.
4. Install the outlet hose to the thermostat housing (1). Secure the hose with the clamp.
5. Install the generator. Refer to «Generator Replacement (4.2L Engine)»(ref-277744-S36703100462008011800000) or «Generator Replacement (5.3L and 6.0L Engines)»(ref-277744-S28084668882008011800000) .
6. Fill the cooling system with specified coolant and concentration. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
7. Inspect all sealing surfaces for leaks after starting the engine.

1. Remove the radiator outlet hose. Refer to «Radiator Outlet Hose Replacement (LH6, LS2)»(ref-277788-S33548480442008011800000) or «Radiator Outlet Hose Replacement (LL8)»(ref-277788-S16842181462008011800000) .
2. Remove the water pump inlet bolts.
3. Remove the water pump inlet and thermostat from the water pump.

1. Install the thermostat and thermostat housing to the water pump.
2. Install the thermostat housing bolts. Tighten: Tighten the bolts to 15 N.m (11 lb ft).
3. Install the radiator outlet hose. Refer to «Radiator Outlet Hose Replacement (LH6, LS2)»(ref-277788-S33548480442008011800000) or «Radiator Outlet Hose Replacement (LL8)»(ref-277788-S16842181462008011800000) .

1. Drain the cooling system, if necessary. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement or Air Cleaner Resonator Outlet Duct Replacement .
3. Reposition the coolant air bleed hose clamp at the coolant air bleed pipe.
4. Remove the coolant air bleed hose from the coolant air bleed pipe.
5. Remove the coolant air bleed pipe bolts (309).
6. Remove the coolant air bleed pipe (307) with seals (308).
7. Remove the coolant air bleed pipe cover bolts (312), if necessary.
8. Remove the coolant air bleed covers (313) with seals (308), if necessary.
9. Remove and discard the seals (308) from the coolant air bleed pipe and covers.

1. Install the seals (308) onto the coolant air bleed pipe and covers.
2. Install the coolant air bleed pipe (307) with seals (308).
3. Install the coolant air bleed pipe bolts (309). Tighten: Tighten the bolts to 12 N.m (106 lb in).
4. Install the coolant air bleed covers (313) with seals (308), if necessary.
5. Remove the coolant air bleed pipe cover bolts (312), if necessary. Tighten: Tighten the bolts to 12 N.m (106 lb in).
6. Install the coolant air bleed hose to the coolant air bleed pipe.
7. Position the coolant air bleed hose clamp at the coolant air bleed pipe.
8. Fill the cooling system, if necessary. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
9. Install the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement or Air Cleaner Resonator Outlet Duct Replacement .

1. Drain the cooling system, if necessary. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Reposition the coolant air bleed hose clamp at the coolant air bleed pipe.
3. Reposition the coolant air bleed hose clamp at the heater outlet hose.
4. Remove the coolant air bleed hose from the air bleed pipe and the heater hose.

1. Install the coolant air bleed hose to the air bleed pipe and the heater hose.
2. Position the coolant air bleed hose clamp at the coolant air bleed pipe.
3. Position the coolant air bleed hose clamp at the heater outlet hose.
4. Fill the cooling system, if necessary. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Disconnect the radiator inlet hose from the water outlet housing. Refer to «Radiator Outlet Hose Replacement (LH6, LS2)»(ref-277788-S33548480442008011800000) or «Radiator Outlet Hose Replacement (LL8)»(ref-277788-S16842181462008011800000) .
2. Remove the power steering pump bracket. Refer to «Power Steering Pump Bracket Replacement»(ref-277765-S07148307362008011800000) .
3. Remove the water outlet housing bolts.
4. Remove the water outlet housing and seal. Discard the old seal.

1. Remove any burrs or foreign material from the sealing surface of the engine cylinder head and the water outlet housing.
2. Install a NEW seal and the water outlet housing.
3. Install the water outlet housing bolts. Tighten: Tighten the water outlet bolts to 10 N.m (89 lb in).
4. Connect the radiator inlet hose to the water outlet housing. Refer to «Radiator Outlet Hose Replacement (LH6, LS2)»(ref-277788-S33548480442008011800000) or «Radiator Outlet Hose Replacement (LL8)»(ref-277788-S16842181462008011800000) .
5. Install the power steering pump bracket. Refer to «Power Steering Pump Bracket Replacement»(ref-277765-S07148307362008011800000) .

1. Drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Loosen the air cleaner outlet duct clamps at the following locations: Throttle body Mass air flow (MAF)/intake air temperature (IAT) sensor
3. Remove the air cleaner outlet duct bolt and duct.
4. Remove the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory for the 5.3L engine or Drive Belt Tensioner Replacement - Accessory for the 6.0L engine.
5. Remove the cooing fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .
6. Using the J 38185 , reposition the inlet hose clamp at the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
7. Remove the inlet hose from the water pump.
8. Using the J 38185 , reposition the outlet hose clamp at the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
9. Remove the outlet hose from the water pump.
10. Remove the auxiliary heater inlet and outlet hose/pipe nut.
11. Using the J 38185 , reposition the throttle body hose clamp at the throttle body. See «Special Tools»(ref-277788-S20027075962008011800000) .
12. Remove the hose from the throttle body.
13. Using the J 38185 , reposition the auxiliary heater inlet and outlet hose/pipe clamps at the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
14. Remove the inlet and outlet hoses/pipes from the water pump.
15. Remove the water pump bolts.
16. Remove the water pump and gaskets.
17. Discard the water pump gaskets.

1. Install the water pump and NEW gaskets.
2. Install the water pump bolts. Tighten: On the initial pass, tighten the bolts to 15 N.m (11 lb ft). On the final pass, tighten the bolts to 30 N.m (22 lb ft).
3. Install the auxiliary heater inlet and outlet hose/pipe nut. Tighten: Tighten the nut to 10 N.m (89 lb in).
4. Install the hose to the throttle body.
5. Using J 38185 , position the throttle body hose clamp at the throttle body. See «Special Tools»(ref-277788-S20027075962008011800000) .
6. Install the inlet and outlet hoses/pipes to the water pump.
7. Using J 38185 , position the auxiliary heater inlet and outlet hose/pipe clamps at the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
8. Install the outlet hose to the water pump.
9. Using J 38185 , position the outlet hose clamp at the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
10. Install the inlet hose to the water pump.
11. Using J 38185 , position the inlet hose clamp at the water pump. See «Special Tools»(ref-277788-S20027075962008011800000) .
12. Install the cooing fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .
13. Install the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory for the 5.3L engine or Drive Belt Tensioner Replacement - Accessory for the 6.0L engine.
14. Install the air cleaner outlet duct and bolt. Tighten: Tighten the bolt to 10 N.m (89 lb in).
15. Tighten the air cleaner outlet duct clamps at the following locations: Throttle body MAF/IAT sensor Tighten: Tighten the clamps to 7 N.m (62 lb in).
16. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Drain the coolant from the radiator. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the lower radiator support shield, if equipped. Refer to «Radiator Support Shield Replacement»(ref-277739-S32699155982008011800000) .
3. Remove the transmission cooler lines from the radiator. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Replacement»(ref-277732-S12253804742008011800000) for the 4L60-E/4L65-E transmission.
4. Reposition the outlet radiator hose clamp using J 38185 . See «Special Tools»(ref-277788-S20027075962008011800000) .
5. Remove the outlet radiator hose (1) from the radiator.
6. Lower the vehicle.
7. Reposition the inlet radiator hose clamp using J 38185 . See «Special Tools»(ref-277788-S20027075962008011800000) .
8. Remove the inlet radiator hose from the radiator.
9. Remove the cooling fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .
10. Remove the air inlet grille. Refer to «Air Inlet Grille Panel Replacement (Envoy, TrailBlazer)»(ref-277724-S17188846652008011800000) or «Air Inlet Grille Panel Replacement (Rainier)»(ref-277724-S12194024222008011800000) .
11. Remove the coolant recovery line from the radiator.
12. Remove the upper radiator to condenser bolts.
13. Lift upward on the condenser to remove from the radiator retaining tab.
14. Remove the radiator.

1. Install the radiator.
2. Install the condenser to the radiator retaining tab.
3. Install the bolts retaining the condenser to the radiator. Tighten: Tighten the bolts to 28 N.m (21 lb ft).
4. Install the coolant recovery line to the radiator.
5. Install the air inlet grille. Refer to «Air Inlet Grille Panel Replacement (Envoy, TrailBlazer)»(ref-277724-S17188846652008011800000) or «Air Inlet Grille Panel Replacement (Rainier)»(ref-277724-S12194024222008011800000) .
6. Install the cooling fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .
7. Install the inlet radiator hose to the radiator.
8. Reposition the inlet radiator hose clamp using J 38185 . See «Special Tools»(ref-277788-S20027075962008011800000) .
9. Raise the vehicle.
10. Install the outlet radiator hose (1) to the radiator.
11. Reposition the outlet radiator hose clamp (1) using J 38185 . See «Special Tools»(ref-277788-S20027075962008011800000) .
12. Connect the transmission cooler lines to the radiator. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Replacement»(ref-277732-S12253804742008011800000) for the 4L60-E/4L65-E transmission.
13. Install the lower radiator support shield, if equipped. Refer to «Radiator Support Shield Replacement»(ref-277739-S32699155982008011800000) .
14. Lower the vehicle.
15. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Drain the coolant from the radiator. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(ref-277731-S30292104982008011800000) .
3. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-277741-S34013826382008011800000) .
4. Remove the lower radiator support shield, if equipped. Refer to «Radiator Support Shield Replacement»(ref-277739-S32699155982008011800000) .
5. Reposition the outlet radiator hose clamp using J 38185 . See «Special Tools»(ref-277788-S20027075962008011800000) .
6. Remove the outlet radiator hose (1) from the radiator.
7. Remove the transmission cooler lines from the radiator. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Replacement»(ref-277732-S12253804742008011800000) .
8. Lower the vehicle.
9. Remove the cooling fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .
10. Remove the radiator support diagonal brace. Refer to «Radiator Support Diagonal Brace Replacement»(ref-277738-S14799716072008011800000) .
11. Remove the coolant recovery line from the radiator.
12. Disconnect the radiator side panels from the shroud (1).
13. Remove the radiator.
14. Remove the bolts retaining the condenser to the radiator.

1. Install the condenser to the radiator.
2. Install the bolts retaining the condenser to the radiator. Tighten: Tighten the bolts to 28 N.m (21 lb ft).
3. Install the radiator.
4. Install the cooling fan and shroud. Refer to «Cooling Fan and Shroud Replacement»(ref-277788-S36116617122008011800000) .
5. Raise the vehicle.
6. Install the outlet radiator hose (1) to the radiator.
7. Reposition the outlet radiator hose clamp (1) using J 38185 . See «Special Tools»(ref-277788-S20027075962008011800000) .
8. Connect the transmission cooler lines to the radiator. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Replacement»(ref-277732-S12253804742008011800000) .
9. Install the lower radiator support shield, if equipped. Refer to «Radiator Support Shield Replacement»(ref-277739-S32699155982008011800000) .
10. Lower the vehicle.
11. Install the coolant recovery hose to the radiator.
12. Install the radiator support diagonal brace. Refer to «Radiator Support Diagonal Brace Replacement»(ref-277738-S14799716072008011800000) .
13. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Drain the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-277741-S34013826382008011800000) .
3. Disconnect the coolant heater (1) electrical connector.
4. Remove the coolant heater from the engine block.
5. Remove any burrs, sealer, paint or other rough spots.

1. If re-using the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.
2. Install the coolant heater to the engine block. Tighten: Tighten the coolant heater to 50 N.m (37 lb ft).
3. Connect the coolant heater (1) electrical connector.
4. Lower the vehicle.
5. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. Drain the engine coolant. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .
2. Remove the powertrain control module (PCM) retaining bolts (3) and nuts (6).
3. Remove the PCM mounting studs (5) and position the PCM out of the way.
4. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1).
5. Disconnect the fuel feed (1) and fuel return (2) pipes from the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(ref-277758-S10312068162008011800000) .
6. Disconnect the integral clip (3) from the wire harness bracket.
7. Remove the engine wire harness bracket bolt.
8. Position the engine electrical wire harness bracket with wires attached out of the way.
9. Remove the coolant heater cord from the heater (2).
10. Remove the coolant heater from the block.

1. Remove any burrs, sealer, paint or other foreign material from the threads/sealing surface of the engine block and from the old coolant heater if the heater is to be reused.
2. If reusing the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.
3. Install the coolant heater to the engine block. Tighten: Tighten the coolant heater to 50 N.m (37 lb ft).
4. Install the coolant heater cord to the heater (2).
5. Properly position the engine electrical harness bracket to the intake manifold.
6. Install the engine electrical harness bracket bolt. Tighten: Tighten the bolt to 10 N.m (89 lb in).
7. Connect the integral clip (3) to the wire harness bracket.
8. Connect the fuel feed (1) and fuel return (2) pipes to the fuel rail. Refer to «Metal Collar Quick Connect Fitting Service»(ref-277758-S10312068162008011800000) .
9. Connect the ECT sensor electrical connector (1).
10. Install the PCM mounting studs (5) to the intake manifold. Tighten: Tighten the studs to 6 N.m (53 lb in).
11. Install the PCM (1) onto the studs (5).
12. Install the PCM retaining bolts (3). Tighten: Tighten the bolts to 8 N.m (71 lb in).
13. Install the PCM retaining nuts (6). Tighten: Tighten the nuts to 8 N.m (71 lb in).
14. Fill the cooling system. Refer to «Draining and Filling Cooling System (LH6, LS2)»(ref-277788-S13629970882008011800000) or «Draining and Filling Cooling System (LL8)»(ref-277788-S40680054272008011800000) .

1. If equipped with a 4.2L engine, remove the powertrain control module (PCM). Refer to «Powertrain Control Module Replacement»(ref-277758-S08210610912008011800000) .
2. Remove the coolant heater cord from the engine harness bracket (1).
3. Remove the coolant heater cord from the coolant heater (2).
4. If equipped with a 5.3L or 6.0L engine, disconnect the coolant heater cord from the coolant heater (1).
5. Remove the coolant heater cord clip from the engine harness.
6. Disconnect the coolant heater cord retainers (1) from the battery cover.

1. Connect the coolant heater cord retainers (1) to the battery cover.
2. If equipped with a 5.3L or 6.0L engine, connect the coolant heater cord to the coolant heater (1).
3. Install the coolant heater cord clip to the engine harness.
4. If equipped with a 4.2L engine, install the coolant heater cord to the coolant heater (2).
5. Install the coolant heater cord to the engine harness bracket (1).
6. Install the PCM. Refer to «Powertrain Control Module Replacement»(ref-277758-S08210610912008011800000) .