For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: HVAC Schematics
1 | Did you review the Air Delivery Description and Operation and the Air Temperature Description and Operation perform the necessary inspections? | Go to Step 2 | Go to Symptoms - HVAC Systems - Manual
2 | Operate the blower motor at each speed. Does the blower motor operate when turned to the OFF position? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 | Remove the HTR relay from fuse and relay block 3. Does the blower motor run? | Go to Step 4 | Go to Step 5
4 | Repair the short to voltage in the blower motor supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | --
5 | Test that the HTR relay is open between terminals 4 and 5 and that there is continuity between terminals 4 and 2. Refer to Power and Grounding Component Views in Wiring Systems. Did the relay test OK? | Go to Step 6 | Go to Step 7
6 | Test the HTR relay control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8
7 | Replace the heater relay. Did you complete the replacement? | Go to Step 9 | --
8 | Replace the blower switch. Refer to Blower Switch Replacement . Did you complete the replacement? | Go to Step 9 | --
9 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3