my Volkswagen Passat B8 (2015-2022) has no heat coming from the vents what to do

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, screwdrivers, coolant, and a replacement cabin air filter (if needed).
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Coolant Check and Replacement

• Coolant Level Check

  • Open the hood and locate the coolant reservoir.
  • If coolant is low, mix the correct type of coolant with water (50/50) and refill the reservoir to the proper level.

• Coolant Replacement (if needed)

  • Drain the old coolant from the radiator by opening the drain valve at the bottom.
  • Close the valve and refill with the new coolant mixture until full.

3. Thermostat Replacement (if faulty)

• Remove Thermostat

  • Disconnect the battery to avoid electrical issues.
  • Locate the thermostat housing, usually near the engine block.
  • Remove the bolts securing the housing and detach it from the engine.

• Install New Thermostat

  • Remove the old thermostat and replace it with a new one, ensuring the correct orientation.
  • Reattach the thermostat housing and tighten the bolts to the manufacturer's torque specifications.

4. Heater Control Valve Inspection/Replacement

• Inspect and Test

  • Locate the heater control valve, usually near the firewall.
  • Disconnect the electrical connector and check for function (it should open and close with temperature adjustments).

• Replace (if necessary)

  • If the valve is faulty, unbolt it from its mounting and replace it with a new unit, ensuring all connections are secure.

5. Cabin Air Filter Replacement

• Access Filter

  • Locate the cabin air filter compartment, usually behind the glove box.
  • Remove any screws or clips securing the glove box and gently pull it down.

• Replace Filter

  • Remove the old cabin air filter and insert a new one, ensuring it is oriented correctly according to airflow direction.