For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Cooling Fan System Check? | Go to Step 2 | Go to Cooling Fan System Check
2 | Test the ignition voltage supply circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 3
3 | Test the ground circuit of the heater water auxiliary pump for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 4
4 | Inspect for poor connections at the harness connector of the heater water auxiliary pump. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 5
5 | Replace the heater water auxiliary pump. Refer to Heater Water Auxiliary Pump Replacement . Is the repair complete? | Go to Step 6 | --
6 |

1. Connect all connectors and components that were disconnected.
2. Verify the heater water auxiliary pump operates properly?

Does the heater water auxiliary pump operate properly?

Go to Cooling Fan System Check

Go to Step 1