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.
Control Module
System temperature control is accomplished by a control module containing a microprocessor. Control module is mounted on top of control panel assembly. See Fig 1 .
Inputs to control module include in-car temperature sensor, ambient temperature sensor, control panel blower switch and temperature and function lever settings. These inputs are used to determine blend door position (through direct current actuator motor) and variable blower speed. When vacuum selector valve is in floor position, blower operation is controlled by thermal blower lock-out switch.
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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.