my Volkswagen Passat B8 (2015-2022) defroster is not working is that normal

Solution

1. Preparation

• Gather necessary tools: OBD-II scanner, multimeter, socket set, and a flathead screwdriver.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Check and Replace Fuses

• Locate the fuse box and remove the cover.
• Identify the specific fuse for the HVAC/defroster system using the diagram.
• Use a fuse puller or pliers to remove the fuse and inspect it for continuity.
  • If blown, replace with a fuse of the same amperage (usually 10-20A depending on model).
• Reinstall the fuse box cover.

3. Inspect and Replace Cabin Air Filter

• Locate the cabin air filter housing, typically behind the glove compartment.
• Remove the glove compartment to access the housing.
• Open the filter compartment and remove the old cabin air filter.
• Inspect the filter for dirt and debris; replace with a new filter if necessary.
• Reassemble the glove compartment.

4. Test and Replace Blower Motor

• Reconnect the battery and turn on the vehicle.
• Set the HVAC system to the highest setting and listen for the blower motor operation.
• If the blower motor is not functioning, disconnect the electrical connector and use a multimeter to check for voltage.
  • If there is no voltage, trace the wiring back to the control module.
• If voltage is present but the motor does not operate, replace the blower motor.
• To replace, remove the motor assembly from its housing (typically requires removing retaining screws).