For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you review the HVAC Blower Controls Circuit Description and 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 at high speed only? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 |

1. Ignition switch ON.
2. Blower speed switch OFF.
3. Backprobe the blower motor resistor with a test lamp from cavity 3 to chassis ground.

Does the test lamp light?

Go to Step 5

Go to Step 4

4 | Repair the open in the PNK wire between the blower motor resistor and S204 (in the harness about 6 inches from the blower motor resistor connector). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 6 | --
5 | Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement . Is the repair complete? | Go to Step 6 | --
6 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3