Buick Regal: Engine Coolant Thermostat Housing Inlet Pipe Replacement (3.6L LGX)

Removal Procedure

1. Drain the cooling system.

2. Engine Rear Noise Shield - Remove.

3.

Radiator Inlet Hose Clamp (1) - Disengage.

4. Radiator Inlet Hose (2) - Disconnect.

5. Engine Coolant Thermostat Housing Inlet Pipe Bolt (3) - Remove.

6.

Engine Coolant Thermostat Housing Inlet Pipe (1) - Remove.

7. Engine Coolant Thermostat Housing Seal (2) - Remove and DISCARD.

Installation Procedure

1.

Engine Coolant Thermostat Housing Seal (2) - Install NEW.

2. Engine Coolant Thermostat Housing Inlet Pipe (1) - Install.

3.

CAUTION: Refer to Fastener Caution.

Engine Coolant Thermostat Housing Inlet Pipe Bolt (3) - Install and tighten10 N.m (89 lb in).

4. Radiator Inlet Hose (2) - Connect.

5. Radiator Inlet Hose Clamp (1) - Engage.

6. Engine Rear Noise Shield - Install.

7. Fill the cooling system.

8. Start the engine and check for leaks.

ENGINE COOLANT AIR BLEED PIPE REPLACEMENT (3.6L LGX)

Removal Procedure

1. Drain the cooling system.

2. Air Cleaner Outlet Duct - Remove.

3.

NOTE: To aid in removal of the engine air bleed pipes, separate the air bleed hose and remove the pipes individually.

NOTE: Using penetrating oil at the locations indicated by the arrows will aid in removal of the pipes from the cylinder heads.

Engine Coolant Air Bleed Hose Clamp (1) - Disengage.

4. Engine Coolant Air Bleed Hose (2) - Disconnect.

5.

Radiator Surge Tank Inlet Hose Clamp (1) - Disengage.

6. Engine Coolant Temperature Sensor Jumper Harness Retainer Clip (2) - Disconnect.

7. Engine Coolant Air Bleed Pipe Bolt (3) - Remove [2x].

8.

Engine Coolant Air Bleed Pipe (1) - Remove.

9. Engine Coolant Air Bleed Pipe O-Ring (2) - Remove and DISCARD [2x].

Installation Procedure

1.

Engine Coolant Air Bleed Pipe O-Ring (2) - Install NEW [2x].

2. Engine Coolant Air Bleed Pipe (1) - Install.

3.

CAUTION: Refer to Fastener Caution.

Engine Coolant Air Bleed Pipe Bolt (3) - Install and tighten [2x] 10 N.m (89 lb in).

4. Engine Coolant Temperature Sensor Jumper Harness Retainer Clip (2) - Connect.

5. Radiator Surge Tank Inlet Hose Clamp (1) - Engage.

6. Air Cleaner Outlet Duct - Install.

7. Fill the cooling system.

8. Start the engine and check for leaks.

ENGINE COOLANT AIR BLEED PIPE REPLACEMENT (2.0L LTG)

Preliminary Procedures

1. Turbocharger Coolant Return Pipe Replacement.

2. Positive Crankcase Ventilation Hose/Pipe/Tube Replacement.

3. Disconnect the electrical wiring harness connector from the ignition coil.

1. Radiator Surge Tank Inlet Hose Clamp

2. Engine Coolant Air Bleed Pipe Bolt

CAUTION: Refer to Fastener Caution.

Tighten 9 N.m (80 lb in)

3. Engine Coolant Air Bleed Pipe

4. Engine Coolant Air Bleed Pipe O-Ring

Procedure

Install a NEW O-ring seal.

ENGINE COOLANT AIR BLEED HOSE REPLACEMENT (3.6L LGX)

Preliminary Procedures

1. Drain the cooling system.

2. Air Cleaner Outlet Duct Replacement.

1. Engine Coolant Air Bleed Hose Clamp [2x].
2. Engine Coolant Air Bleed Hose.

ENGINE COOLANT AIR BLEED HOSE REPLACEMENT - AIR BLEED PIPE TO TURBOCHARGER COOLANT RETURN PIPE (2.0L LTG)

Preliminary Procedure

Remove the engine coolant air bleed pipe. Refer to Engine Coolant Air Bleed Pipe Replacement (3.6L LGX) or Engine Coolant Air Bleed Pipe Replacement (2.0L LTG).

Special Tools

BO-38185 Hose Clamp Pliers

For equivalent regional tools, refer to Special Tools.

1. Engine Coolant Air Bleed Hose

NOTE: Replace hose clamps if necessary.

ENGINE COOLANT AIR BLEED HOSE REPLACEMENT - AIR BLEED PIPE TO RADIATOR SURGE TANK (2.0L LTG)

Preliminary Procedures

1. Intake Manifold Cover - Remove.

1. Engine Coolant Air Bleed Hose Clip
2. Engine Coolant Air Bleed Hose Clamp [2x]

Procedure

Hose Clamp Replacement Guidelines - Spring Type.

3. Engine Coolant Air Bleed Hose

Procedure

1. Intake Manifold Cover - Install.

2. Check the cooling system for leaks.

WATER OUTLET REPLACEMENT (2.0L LTG)

Special Tools

BO-38185 Hose Clamp Pliers

For equivalent regional tools, refer to Special Tools.

Removal Procedure

1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static) or Cooling System Draining and Filling (GE 47716).

2. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.

3. Reposition the engine control module and bracket without disconnecting the module electrical connectors. Refer to Engine Control Module Replacement.

4.

Disconnect the engine coolant temperature (ECT) sensor connector (3) from the water outlet (2).

5. Remove the following hoses from the water outlet:

• Radiator inlet hose (1).
• Heater inlet hose (4).
• Heater outlet hose (5).

6.

Remove the water outlet fasteners (3) and remove the water outlet (2).

7.

Remove the thermostat bypass hose (2) from the water outlet (3).

8. Discard the water outlet seal (1).

Installation Procedure

1.

Install the thermostat bypass hose (2) to the water outlet (3).

2.

Install the water outlet (2) into position with a NEW seal (1).

CAUTION: Refer to Fastener Caution.

3. Install the water outlet fasteners (3) and tighten to 12 N.m (106 lb in).

4.

Connect the engine coolant temperature (ECT) sensor connector (3) to the water outlet (2).

5. Install the following hoses to the water outlet:

• Radiator inlet hose (1).
• Heater inlet hose (4).
• Heater outlet hose (5).

6. Install the engine control module and bracket. Refer to Engine Control Module Replacement.

7. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement.

8. Fill the cooling system. Refer to Cooling System Draining and Filling (Static) or Cooling System Draining and Filling (GE 47716).

9. Start the engine and check for coolant leaks.

THERMOSTAT BYPASS PIPE REPLACEMENT (2.0L LTG)

Removal Procedure

1. Drain the cooling system.

2. Exhaust Manifold Brace - Remove.

3.

Thermostat Bypass Hose Clamp (1) - Disengage.

4. Engine Oil Cooler Inlet Hose Clamp (2) - Disengage.

5.

Thermostat Bypass Pipe Bolt (1) - Remove [2x].

6. Thermostat Bypass Pipe (2) - Remove.

7. Thermostat Bypass Pipe Gasket (3) - Remove and DISCARD.

Installation Procedure

1.

NOTE: Install a NEW thermostat bypass pipe gasket.

Thermostat Bypass Pipe Gasket (3) - Install.

2. Thermostat Bypass Pipe (2) - Install.

CAUTION: Refer to Fastener Caution.

3. Thermostat Bypass Pipe Bolt (1) - Install and tighten [2x] 10 N.m (89 lb in).

4.

Engine Oil Cooler Inlet Hose Clamp (2) - Engage.

5. Thermostat Bypass Hose Clamp (1) - Engage.

6. Exhaust Manifold Brace - Install.

7. Fill the cooling system.

8. Start the engine and check for leaks.

HEATER INLET AND OUTLET PIPE REPLACEMENT

Preliminary Procedures

1. Drain the cooling system.

2. Air Cleaner Assembly Replacement.

1. Heater Hose Clamp [2x]
2. Heater Inlet and Outlet Pipe Bolt [2x]

CAUTION: Refer to Fastener Caution.

Tighten 9 N.m (80 lb in)

3. Heater Inlet and Outlet Pipe
4. Heater Inlet and Outlet Pipe Gasket

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