why does my Ford F-150 13th Generation (2015-2020) AC smell like mildew when I turn it on

Ford F-150 13th Generation (2015-2020)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

539 words

Problem Statement

Learn how to diagnose and fix mildew smell in AC for Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

HVAC

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is turned off and cool before starting work on the AC system.

Symptoms

•Mildew or musty smell when AC is turned on
•Reduced airflow from vents
•Increased humidity inside the cabin
•Visible moisture on the inside of the windshield
•Potential increase in mold growth within the cabin air filter

Diagnostic Steps

1
Inspect the cabin air filter for dirt and mold accumulation.
2
Check the AC drain tube for clogs or blockages.
3
Examine the evaporator core for signs of mold or mildew.
4
Test the operation of the AC system in both recirculate and fresh air modes.
5
Look for any water leaks inside the cabin that may indicate drainage issues.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Flathead screwdriver
•Socket set
•Vacuum
•Disinfectant spray
•New cabin air filter
•Drain cleaning brush

Parts Required

•New cabin air filter

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Diagnostic Steps

1
Inspect the cabin air filter for dirt and mold accumulation.
2
Check the AC drain tube for clogs or blockages.
3
Examine the evaporator core for signs of mold or mildew.
4
Test the operation of the AC system in both recirculate and fresh air modes.
5
Look for any water leaks inside the cabin that may indicate drainage issues.

Solution

1. Preparation

Gather tools and materials: flathead screwdriver, socket set, vacuum, disinfectant spray, new cabin air filter, and a drain cleaning brush.
Park the vehicle on a level surface and turn off the ignition.

2. Remove Cabin Air Filter

Sub-steps:
1. Open the glove compartment and remove any contents.
2. Locate the stops on both sides of the glove compartment and gently push them inward to allow the compartment to drop down.
3. Unscrew the cover of the cabin air filter housing using a flathead screwdriver.
4. Pull out the old cabin air filter and inspect for mold or dirt.
Tools Required: Flathead screwdriver

3. Clean Evaporator Core

Sub-steps:
1. Use a vacuum to remove any debris around the evaporator core area.
2. Spray a disinfectant cleaner onto the evaporator core through the drain tube if accessible or directly into the AC vents to kill mold.
3. Allow the cleaner to sit for 10-15 minutes.
Tools Required: Vacuum, disinfectant spray

4. Clear AC Drain Tube

Sub-steps:
1. Locate the AC drain tube underneath the vehicle.
2. Use a drain cleaning brush to clear any blockages in the tube.
3. Pour a small amount of water into the drain tube to ensure it flows freely.
Tools Required: Drain cleaning brush

5. Install New Cabin Air Filter

Sub-steps:
1. Insert the new cabin air filter into the housing, ensuring it fits securely.
2. Reattach the cover of the cabin air filter housing and screw it back in place.
3. Lift the glove compartment back into position and secure the stops.
Tools Required: Flathead screwdriver, new cabin air filter