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 40 (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 2005 Saturn L300. 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 temperature gage shows hot, or coolant overflows from the surge tank onto the ground while the engine is running. | ||||
| 1 | Check for a loss of coolant. Refer to Loss of Coolant . Is there a loss of coolant? |
- | Go to Step 2 | Go to Step 3 |
| 2 | Fill the system to the specified level. Refer to Draining and Filling Cooling System . Does the engine still overheat? |
- | Go to Step 3 | System OK |
| 3 | Check for kinked or pinched surge tank hoses, especially at the radiator. Are any surge tank hoses kinked or pinched? |
- | Go to Step 4 | Go to Step 5 |
| 4 |
|
- | Go to Step 5 | System OK |
| 5 | Check for loose, missing or damaged radiator air seals or deflectors. Are there any loose, missing or damaged radiator air seals or deflectors? |
- | Go to Step 6 | Go to Step 7 |
| 6 | Repair or replace any loose, missing or damaged radiator air seals or deflectors. Does the engine still overheat? |
- | Go to Step 7 | System OK |
| 7 | Check the coolant concentration. Does the coolant concentration test correctly? |
- | Go to Step 9 | Go to Step 8 |
| 8 | Replace the coolant if necessary. Refer to Draining and Filling Cooling System . Does the engine still overheat? |
- | Go to Step 9 | System OK |
| 9 |
IMPORTANT:
Use the correct pressure cap. Check the system for loss of pressure.Is there a loss of pressure? |
- | Go to Step 10 | Go to Step 11 |
| 10 | Repair any leaks as necessary. Does the engine still overheat? |
- | Go to Step 11 | System OK |
| 11 | Check for a faulty engine coolant temperature sensor (ECT). Is the engine coolant temperature sensor faulty? |
- | Go to Step 12 | Go to Step 13 |
| 12 | Replace the ECT. Refer to Engine Coolant Temperature (ECT) Sensor Replacement
in Engine Controls - 3.0L (L81). Does the engine still overheat? |
- | Go to Step 13 | System OK |
| 13 | Check the radiator for any air flow obstructions or bent fins. Is there any airflow obstruction or bent fins? |
- | Go to Step 14 | Go to Step 15 |
| 14 |
|
- | Go to Step 15 | System OK |
| 15 | Check for any blocked cooling system passages. Are there any blocked cooling system passages? |
- | Go to Step 16 | Go to Step 17 |
| 16 |
|
- | Go to Step 17 | System OK |
| 17 | Check for an inoperative cooling fan. Is the cooling fan inoperative? |
- | Go to Step 18 | Go to Step 19 |
| 18 | Replace the cooling fan. Refer to Cooling Fan Replacement - Electric (L81) or Cooling Fan Replacement - Electric (Pusher Fan) . Does the engine still overheat? |
- | Go to Step 19 | System OK |
| 19 | Check for a thermostat that is stuck closed. Is the thermostat stuck closed? |
- | Go to Step 20 | Go to Step 21 |
| 20 | Replace the thermostat. Refer to Thermostat Replacement . Does the engine still overheat? |
- | Go to Step 21 | System OK |
| 21 | Check for a faulty water pump. The impeller blades may be eroded or broken. Is the water pump faulty? |
- | Go to Step 22 | - |
| 22 | Replace the water pump. Refer to Water Pump Replacement (L81) . Does the engine still overheat? |
- | - | System OK |
RENDER: 1.0x
NO RELATED
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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.