why is my Volkswagen Golf MK7 (2015-2019) making a musty smell when the AC is on?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.

2. Replace Cabin Air Filter

• Step 1: Locate the cabin air filter housing, usually found behind the glove compartment.
• Step 2: Remove the glove compartment by releasing the clips or screws that hold it in place.
• Step 3: Take out the old cabin air filter and check for dirt or mold.
• Step 4: Install a new, high-efficiency cabin air filter.

3. Clean AC Evaporator

• Step 1: Access the AC evaporator by removing any necessary panels.
• Step 2: Spray an AC evaporator cleaner onto the evaporator core to eliminate mold and mildew.
• Step 3: Allow the cleaner to sit for the recommended time specified on the product label.

4. Clear Drain Tube

• Step 1: Locate the AC drain tube, typically found under the vehicle.
• Step 2: Use compressed air or a flexible wire to clear any blockages in the drain tube.
• Step 3: Ensure that water can flow freely from the hose.

5. Reassemble and Test

• Step 1: Reassemble any panels or components that were removed during the process.
• Step 2: Reconnect the battery.
• Step 3: Start the vehicle and run the AC to check for any lingering odors.