why does my Volkswagen Passat B8 (2015-2022) have a sweet smell inside

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cold.

2. Inspect and Replace the Coolant Reservoir

• Tools Required: Socket set, screwdriver, drain pan.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Remove any components obstructing access to the coolant reservoir.
• Inspect the reservoir for cracks or leaks and replace if damaged.
• Refill with the appropriate coolant type (refer to owner's manual).

3. Check and Repair the Heater Core

• Tools Required: Socket set, pliers, towels.
• Remove the dashboard panel to access the heater core (make a note of the wiring).
• Inspect for leaks around the heater core connections.
• If leaking, replace the heater core following manufacturer specifications.
• Reassemble the dashboard and reconnect all components.

4. Test for Leaks

• Tools Required: UV leak detection kit (if used).
• Refill the coolant system and run the engine to operating temperature.
• Use UV dye if added to check for any leaks that may not have been visible initially.
• Monitor for any signs of leakage from the reservoir and heater core.