my Ford F-150 13th Generation (2015-2020) has a weird smell after running the AC, what's wrong?

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

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

565 words

Problem Statement

Learn how to diagnose and fix strange smells from the AC in your Ford F-150 13th Generation (2015-2020). Step-by-step guide with symptoms and solutions.

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before accessing the AC system.

Symptoms

•Unpleasant odor emanating from the AC vents
•Musty or moldy smell
•Decreased airflow from the AC system
•Increased humidity inside the cabin
•Occasional water pooling under the vehicle

Diagnostic Steps

1
Inspect the cabin air filter for dirt, debris, or mold.
2
Check the AC drain tube for blockages or clogs.
3
Use an OBD-II scanner to check for any related error codes.
4
Examine the evaporator core for signs of mold or mildew growth.
5
Inspect the AC compressor for refrigerant leaks or oil contamination.
6
Verify that the AC system is functioning correctly by measuring vent temperature.

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

•Screwdriver
•Compressed air or flexible cleaning brush
•Evaporator cleaner spray
•Soft brush
•Refrigerant leak detector
•Manifold gauge set

Parts Required

•Cabin air filter
•Evaporator cleaner

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Diagnostic Steps

1
Inspect the cabin air filter for dirt, debris, or mold.
2
Check the AC drain tube for blockages or clogs.
3
Use an OBD-II scanner to check for any related error codes.
4
Examine the evaporator core for signs of mold or mildew growth.
5
Inspect the AC compressor for refrigerant leaks or oil contamination.
6
Verify that the AC system is functioning correctly by measuring vent temperature.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the negative battery terminal for safety.

2. Replace Cabin Air Filter

Tools Needed: Screwdriver, new cabin air filter
Remove the glove compartment by unscrewing the retaining screws.
Locate the cabin air filter housing, usually behind the glove compartment.
Remove the old cabin air filter and clean the housing of any debris.
Install the new cabin air filter, ensuring correct orientation.

3. Clear AC Drain Tube

Tools Needed: Compressed air or a flexible cleaning brush
Locate the AC drain tube, typically located on the passenger side under the vehicle.
Use compressed air or a flexible brush to clear any blockages in the tube.
Ensure that water can drain freely when the AC is operational.

4. Clean Evaporator Core

Tools Needed: Evaporator cleaner spray, soft brush
Access the evaporator core by removing the dashboard (if necessary) or through the access panel.
Spray the evaporator cleaner onto the evaporator core to eliminate mold and mildew.
Gently scrub with a soft brush to remove any buildup, then allow it to dry.

5. Check for Refrigerant Leaks

Tools Needed: Refrigerant leak detector, manifold gauge set
Connect the manifold gauge set to the AC service ports.
Check the pressure readings; low pressure may indicate a refrigerant leak.
Use a refrigerant leak detector to identify any leaks around the compressor and connections.