my Ford Mustang S650 (2024-Present) has a musty smell when the AC is on, what’s wrong?

Solution

1. Preparation

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

2. Remove Cabin Air Filter

• Locate the cabin air filter housing (usually behind the glove box).
• Open the glove box and remove any obstructions.
• Remove the cabin air filter by unclipping or unscrewing the housing cover.
• Inspect the filter for dirt or mold; replace if necessary.

3. Clear Drain Tube

• Locate the AC drain tube, typically found on the passenger side under the vehicle.
• Use compressed air or a flexible wire to clear any blockages.
• Ensure the drain tube is free-flowing to allow condensation to escape.

4. Clean the Evaporator Core

• Access the evaporator core by removing the HVAC unit (refer to service manual for specific instructions).
• Use a specialized evaporator cleaner or a mixture of water and vinegar to spray the core.
• Allow it to soak for 10-15 minutes before rinsing with clean water (if applicable).
• Ensure the core is dry before reassembling.

5. Replace Cabin Air Filter and Reassemble

• Install a new cabin air filter if replaced.
• Reattach the cabin filter housing cover and reassemble the glove box.
• Reconnect the vehicle battery.