Coolant Heater Inoperative
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Coolant Heater Inoperative Diagnosis
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you perform the necessary inspections? | Go to step 2 | Go to Symptoms - Engine Cooling |
| 2 | Test the engine coolant heater power supply cord for an open or short to ground. Refer to CIRCUIT TESTING . Did you find a condition? | Go to Step 3 | Go to Step 4 |
| 3 | Replace the engine coolant heater power supply cord. Did you complete the repair? | Go to Step 6 | - |
| 4 | Inspect for poor connections at the harness connector of the engine coolant heater. Refer to TESTING FOR INTERMITTENT & POOR CONNECTIONS . Did you find and correct the condition? | Go to Step 6 | Go to Step 5 |
| 5 | Replace the engine coolant heater. Refer to Coolant Heater Replacement . Did you complete the repair? | Go to Step 6 | - |
| 6 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |