Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fan Speed Control
The A/C and heater system blower motor fan is controlled by a 4 position rotary switch located on left side of control panel. Operating speeds are: LOW, MEDIUM LOW, MEDIUM HIGH, and HIGH. These operating speeds are controlled by 3 resistors wired in a series in blower motor resistor blower motor resistor. Resistor assembly also has a thermal limiter which acts as a temperature sensitive fuse. In LOW position, current flows through all 3 resistors. In MEDIUM LOW position, current flows through 2 of resistors. In MEDIUM HIGH position, current flows through one resistor. In HIGH position, current flow bypasses resistors. Limiter will open at approximately 250°F (121°C) and interrupt circuit for all speeds except HIGH. Once opened, limiter cannot be reset. Resistor assembly must be replaced.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.