my Ford F-150 13th Generation (2015-2020) AC is blowing hot air, how to fix?

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

567 words

Problem Statement

Learn how to diagnose and fix AC blowing hot air in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures 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.
•Recover refrigerant properly to adhere to environmental regulations.

Symptoms

•AC system not cooling the air
•Warm air blowing from the vents
•Strange noises when AC is turned on
•Reduced airflow from AC vents
•AC compressor not engaging

Diagnostic Steps

1
Check the AC system for any error codes using an OBD-II scanner.
2
Inspect the AC refrigerant level; look for signs of leaks or low refrigerant.
3
Test the AC compressor operation by observing if it engages when the AC is turned on.
4
Examine fuses related to the AC system for any blown fuses.
5
Check for any obstructions in the AC condenser or evaporator.
6
Verify the operation of the AC blower motor for proper 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
•Refrigerant gauge set
•Refrigerant canister
•Socket set
•Torque wrench
•AC compressor removal tool
•Screwdriver set
•Multimeter

Parts Required

•AC refrigerant
•AC compressor (if faulty)
•Blower motor (if faulty)

Related Faults

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Diagnostic Steps

1
Check the AC system for any error codes using an OBD-II scanner.
2
Inspect the AC refrigerant level; look for signs of leaks or low refrigerant.
3
Test the AC compressor operation by observing if it engages when the AC is turned on.
4
Examine fuses related to the AC system for any blown fuses.
5
Check for any obstructions in the AC condenser or evaporator.
6
Verify the operation of the AC blower motor for proper airflow.

Solution

1. Preparation

Ensure the vehicle is parked on a flat surface.
Disconnect the negative battery terminal to prevent electrical shock.
Gather necessary tools and parts.

2. Check and Recharge Refrigerant

Tools Required: Refrigerant gauge set, refrigerant canister.
Sub-steps:
1. Connect the refrigerant gauge set to the low-pressure service port.
2. Read the pressure; if it is below the manufacturer's specified range, proceed to recharge.
3. Attach the refrigerant canister to the gauge set and open the valve to allow refrigerant to flow into the system.
4. Monitor the pressure until it reaches the recommended level.
5. Disconnect the gauge set and secure the service port cap.

3. Inspect and Replace AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, AC compressor removal tool.
Sub-steps:
1. Remove the drive belt by releasing tension using a belt tensioner tool.
2. Disconnect the electrical connector from the AC compressor.
3. Remove the refrigerant lines from the compressor (ensure refrigerant is recovered properly).
4. Unbolt the compressor from its mounting bracket and remove it from the engine bay.
5. Install the new AC compressor by reversing the removal steps and torque all bolts to manufacturer specifications.

4. Check and Replace Blower Motor (if necessary)

Tools Required: Screwdriver set, multimeter.
Sub-steps:
1. Remove the blower motor access cover (typically located under the dashboard).
2. Disconnect the electrical connector from the blower motor.
3. Test the blower motor using a multimeter to check for continuity.
4. If faulty, remove the blower motor from its housing and replace with a new unit.
5. Reconnect the electrical connector and replace the access cover.