Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 946 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE OVERHEATING
2006 Pontiac G6 GTP, 2D Coupe, Standard
Engine Overheating
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Engine Overheating
WARNING: This page is about a different car, the 2007 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
Engine Overheating
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| DEFINITION: The engine temperature lamp comes on and stays on, or the temperature gauge shows hot, or coolant overflows from the surge tank onto the ground while the engine is running. | ||||
| 1 | Check for low coolant. Is the coolant low? |
- | Go to Step 2 | Go to Step 3 |
| 2 | Fill the system to the specified level. Does the engine still overheat? |
- | Go to Step 3 | System OK |
| 3 | Check for a missing or damaged radiator upper air deflector, baffle, or center air deflector. Are there any missing or damaged deflectors or baffles? |
- | Go to Step 4 | Go to Step 5 |
| 4 | Repair or replace any deflectors or baffles as necessary. Does the engine still overheat? |
- | Go to Step 5 | System OK |
| 5 | Check the coolant concentration. Is the coolant concentration adequate? |
- | Go to Step 7 | Go to Step 6 |
| 6 | Correct the coolant concentration as necessary. Does the engine still overheat? |
- | Go to Step 7 | System OK |
| 7 | Pressure test the cooling system. Does the cooling system maintain the correct pressure? |
103 kPa (15 psi) | Go to Step 9 | Go to Step 8 |
| 8 | Refer to Loss of Coolant . Does the engine still overheat? |
- | Go to Step 9 | System OK |
| 9 | Check for a pinched or kinked radiator surge tank hose. Is the surge tank hose kinked or damaged? |
- | Go to Step 10 | Go to Step 11 |
| 10 | Reroute or replace the hose as necessary. Does the engine still overheat? |
- | Go to Step 11 | System OK |
| 11 | Check the water pump belt tension. Is the tensioner working properly? |
- | Go to Step 13 | Go to Step 12 |
| 12 | Replace the tensioner as necessary. Does the engine still overheat? |
- | Go to Step 13 | System OK |
| 13 | Check for an obstructed radiator air flow or bent fins. Are any radiator fins bent or is air flow to the radiator being obstructed? |
- | Go to Step 14 | Go to Step 15 |
| 14 | Remove or relocate add on parts that block air flow to the radiator. Does the engine still overheat? |
- | Go to Step 15 | System OK |
| 15 | Check for a blockage in the cooling system passages. Are the cooling system passages blocked? |
- | Go to Step 16 | Go to Step 17 |
| 16 |
|
- | Go to Step 17 | System OK |
| 17 | Check for an inoperative cooling fan. Are the cooling fans inoperative? |
- | Go to Step 18 | Go to Step 19 |
| 18 | Repair or replace the cooling fan as necessary. Refer to Cooling Fan Motor Replacement - Electric . Does the engine still overheat? |
- | Go to Step 19 | System OK |
| 19 | Check if the thermostat is stuck in the closed position. Is the thermostat sticking or stuck in the closed position? |
- | Go to Step 20 | Go to Step 21 |
| 20 | Replace the thermostat. Refer to Thermostat Replacement (RPO L26) or Thermostat Replacement (RPO LD8) . Does the engine still overheat? |
- | Go to Step 21 | System OK |
| 21 | Check for a faulty water pump. Is the water pump faulty? |
- | Go to Step 22 | - |
| 22 | Replace the water pump. Refer to Water Pump Replacement (RPO L26) or Water Pump Replacement (RPO LD8) . Does the engine still overheat? |
- | - | System OK |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.