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The heater-ac fan and window demist have stopped working on your 1998 VW Passat fuses are ok Where else do you look?

1. Blower Motor: The blower motor is responsible for circulating air through the vents of your car. If it's not working, no air will be blown through the vents, regardless of the fan speed setting you select. Check the blower motor and ensure it's receiving power. Also, check for any obstructions that might be blocking the airflow, such as leaves or debris.

2. Blower Motor Resistor: The blower motor resistor controls the fan speed of the blower motor. If it's faulty, you won't be able to adjust the fan speed, and the fan will either run at full speed or not at all. Check the blower motor resistor and ensure it's getting power and properly grounded.

3. HVAC Control Module: The HVAC control module is responsible for controlling the operation of the heater, AC, and fan. If it's not working correctly, it could prevent the fan and window demist from functioning properly. Check the HVAC control module and make sure it's getting power and properly grounded.

4. Wiring: Check the wiring between the blower motor, blower motor resistor, HVAC control module, and the battery. If there are any loose or damaged wires, it could prevent the fan and window demist from working.

5. Engine Coolant Level: If the engine coolant level is low, it could cause the heater core to overheat and stop working. Check the engine coolant level and add more if necessary.

6. HVAC Vacuum Lines: Check the HVAC vacuum lines for any leaks or damage. If there are any leaks, it could prevent the vents from opening and closing properly, which would affect the airflow.

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