For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the HVAC System Check? | Go to Step 2 | Go to HVAC System Check
2 |

1. Turn the ignition switch to the OFF position.
2. Disconnect the blower speed selector switch.
3. Move the blower speed selector switch to the MEDIUM 1 position.
4. Test for an open between terminals 3 and 4 of the blower speed selector switch.

Is an open present?

Go to Step 5

Go to Step 3

3 | Test for an open in the RED wire between the blower speed selector switch and the blower motor resistor. Is an open present? | Go to Step 6 | Go to Step 4
4 | Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement . Is the repair complete? | Go to HVAC System Check | --
5 | Replace the blower speed selector switch. Refer to Blower Switch Replacement . Is the repair complete? | Go to HVAC System Check | --
6 | Repair the open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to HVAC System Check | --