For 1990-2009 cars

## Engine Coolant Thermostat Housing Replacement 3.6L Engine LWB

### Removal Procedure

Caution: Refer to Battery Disconnect Caution in the Preface section.

1. Disconnect the battery ground cable from the battery. Refer to Battery Negative Cable Disconnection and Connection.
2. Remove the engine cover. Refer to Engine Cover Replacement in Engine Mechanical - 3.6L.
3. Remove the air intake duct. Refer to Air Cleaner Inlet Duct Replacement.
4. Remove the radiator air baffle and deflector. Refer to Radiator Air Upper Baffle and Deflector Replacement in Body Front End.
5. Remove the catalytic converter assembly from the vehicle. Refer to Catalytic Converter Replacement - Right Side.
6. Lower the transmission by 65mm. Refer to Transmission Replacement.

Important: Store used coolant in the correct manner, such as in a used engine coolant holding tank. Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound.

7. Drain the cooling system. Refer to Cooling System Draining and Filling.

Important: Do NOT separate the upper and lower intake manifolds.

8. Remove the intake manifolds. Refer to Upper Intake Manifold Replacement and Refer to Lower Intake Manifold Replacement.

Important: Assure material used to cover intake ports is lint free to prevent any foreign matter entering the ports.

9. Cover the exposed intake ports.
10. Remove the coolant inlet pipe. Refer to Engine Coolant Inlet Pipe Replacement in Engine Cooling.

Caution: Refer to Safety Glasses Caution in the Preface section.

11. Detach the heater hose (1) quick connect fitting by releasing the retaining clip (3) with a suitable screwdriver, from the heater pipe (2).
12. Disconnect the heater hoses (1) from the heater pipes (1).
13. Disconnect the engine harness to obtain easier access to the heater hose flange and thermostat housing bolts. Refer to Ignition Coil Replacement - Bank 1 and Ignition Coil Replacement - Bank 2.
14. Remove the bolt (3) which secures the heater hose assembly (4) to the right hand cylinder head (2).
15. Remove the heater hose assembly to thermostat housing (1) retaining bolts (5).
16. Remove the heater hose assembly and discard the O-ring seals (6).

Important: The thermostat housing has one longer bolt which is located in the upper left of the housing.

Important: When replacing the thermostat housing always renew the block gasket (1).

17. Remove the thermostat housing retaining bolts (4) rubber grommets (3) then remove the thermostat housing (2).

### Installation Procedure

Notice: Refer to Fastener Notice in the Preface section.

1. Install the thermostat housing retaining bolts (4) ensuring a new block gasket (1) and rubber grommets (3) has been fitted.

Tighten
Tighten the bolts (4) to 10 N·m (89 lb in).

Notice: Refer to Fastener Notice in the Preface section.

2. Install the heater pipe assembly (4) to thermostat housing (1) retaining bolts ensuring new O-ring seals (6) have been fitted.

Tighten
Tighten the bolts (5) to 10 N·m (89 lb in).

3. Install the heater pipe assembly (4) to cylinder head (2) retaining bolt (3).

Tighten
Tighten the bolts to 35 N·m (26 lb ft).

4. Install the engine harness. Refer to Ignition Coil Replacement - Bank 1 and Ignition Coil Replacement - Bank 2.

Caution: Refer to Installing Hoses without Twists or Bends Notice in the Preface section.

Caution: Refer to Safety Glasses Caution in the Preface section.

5. Attach the heater hose (1) quick connect fitting (3) by pushing the hose onto the heater pipe (2) listen for a audible click to confirm fitting.
6. Install the coolant inlet pipe. Refer to Engine Coolant Inlet Pipe Replacement in Engine Cooling.

Important: Do NOT separate the upper and lower intake manifolds.

7. Install the intake manifolds. Refer to Upper Intake Manifold Replacement and Refer to Lower Intake Manifold Replacement.
8. Install the air deflector. Refer to Front Air Deflector Replacement.
9. Install the air intake duct. Refer to Air Cleaner Inlet Duct Replacement.
10. Install the engine cover. Refer to Engine Cover Replacement in Engine Mechanical - 3.6L.
11. Install the radiator air baffle and deflector. Refer to Radiator Air Upper Baffle and Deflector Replacement in Body Front End.
12. Connect the battery ground cable to the battery. Refer to Battery Negative Cable Disconnection and Connection.
13. Fill the cooling system. Refer to Cooling System Draining and Filling.
14. Inspect cooling system for leaks.