how to diagnose why my Ford F-150 13th Generation (2015-2020) AC is not blowing cold air?

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

552 words

Problem Statement

Learn how to diagnose and fix AC not blowing cold air in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC system blowing warm air
•AC compressor not engaging
•Unpleasant odors from the AC vents
•Reduced airflow from the vents
•Unusual noises when the AC is turned on

Diagnostic Steps

1
Check the AC settings on the climate control system to ensure it is set to the correct mode and temperature.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC system's fuses and relays for any blown components.
4
Examine the AC compressor for signs of damage or leakage.
5
Measure the refrigerant level using a manifold gauge set to confirm if the system is low on refrigerant.
6
Inspect the cabin air filter for blockages that could restrict airflow.

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

•OBD-II scanner
•Manifold gauge set
•Socket set
•Safety goggles
•Gloves

Parts Required

•R-134a refrigerant
•AC compressor (if faulty)
•Cabin air filter

Related Faults

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Diagnostic Steps

1
Check the AC settings on the climate control system to ensure it is set to the correct mode and temperature.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC system's fuses and relays for any blown components.
4
Examine the AC compressor for signs of damage or leakage.
5
Measure the refrigerant level using a manifold gauge set to confirm if the system is low on refrigerant.
6
Inspect the cabin air filter for blockages that could restrict airflow.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the vehicle's battery to ensure safety during repair work.
Tools Required: Socket set, manifold gauge set, OBD-II scanner, safety goggles, gloves.

2. Recharge Refrigerant

Connect the manifold gauge set to the AC service ports (low and high).
Check the pressure readings:
- If low, proceed to recharge the system with refrigerant according to manufacturer specifications.
- Use R-134a refrigerant for the 2015-2020 F-150.
Open the valve on the low-pressure side and add refrigerant until the correct pressure is reached.

3. Replace AC Compressor (if necessary)

If the compressor is found to be faulty:
- Remove the serpentine belt by loosening the tensioner.
- Disconnect the electrical connector from the AC compressor.
- Remove the mounting bolts securing the compressor and take out the unit.
Install the new compressor:
- Position the new compressor in place and secure it with the mounting bolts.
- Reconnect the electrical connector and the serpentine belt.
Add the appropriate amount of oil to the new compressor if required.

4. Check and Replace Cabin Air Filter

Locate the cabin air filter housing (usually behind the glove compartment).
Remove the glove compartment to access the filter.
Take out the old cabin air filter and inspect it for dirt or blockages.
Install a new cabin air filter and reassemble the glove compartment.