how to diagnose my Ford F-150 13th Generation (2015-2020) AC not cooling

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

595 words

Problem Statement

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

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Always wear safety glasses and gloves when handling refrigerants.

Symptoms

•AC blows warm air instead of cold
•Unusual noises coming from the AC compressor
•AC compressor clutch not engaging
•Foul odor coming from the vents
•Increased cabin humidity
•Visible refrigerant leaks under the vehicle

Diagnostic Steps

1
Check the AC system for any visible refrigerant leaks around fittings and hoses.
2
Use an OBD-II scanner to check for any stored trouble codes related to the AC system.
3
Verify the AC compressor clutch operation by inspecting its engagement when the AC is turned on.
4
Measure the refrigerant pressure using a manifold gauge set to determine if the system is properly charged.
5
Inspect the cabin air filter for clogs or blockages that could restrict airflow.
6
Test the AC system’s electrical components, including fuses and relays, to ensure they are functioning.

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
•Multimeter
•Vacuum pump
•Socket set

Parts Required

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

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Diagnostic Steps

1
Check the AC system for any visible refrigerant leaks around fittings and hoses.
2
Use an OBD-II scanner to check for any stored trouble codes related to the AC system.
3
Verify the AC compressor clutch operation by inspecting its engagement when the AC is turned on.
4
Measure the refrigerant pressure using a manifold gauge set to determine if the system is properly charged.
5
Inspect the cabin air filter for clogs or blockages that could restrict airflow.
6
Test the AC system’s electrical components, including fuses and relays, to ensure they are functioning.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a level surface and ensure the engine is off.
Disconnect the negative battery terminal for safety.

2. Address Refrigerant Issues

Sub-steps:
1. Connect the manifold gauge set to the AC service ports (high and low).
2. Check the pressure readings to see if they are within the manufacturer’s specifications.
3. If low, evacuate the system using a vacuum pump and recharge with the correct amount of refrigerant (R-134a for most models).

3. Repair or Replace AC Components

Sub-steps:
1. If the compressor clutch is not engaging, inspect the electrical connector for damage and test the voltage with a multimeter.
2. Replace the clutch relay if it is found to be faulty.
3. If the compressor is defective, remove it by disconnecting the refrigerant lines (ensure the system is evacuated), unbolting it from the mounting brackets, and installing a new compressor.

4. Replace Cabin Air Filter

Sub-steps:
1. Locate the cabin air filter compartment (usually under the dashboard).
2. Remove the access panel and take out the old filter.
3. Install the new filter ensuring correct orientation and replace the access panel.

5. System Recharge and Testing

Sub-steps:
1. After repairs, reconnect the refrigerant lines and ensure they are tight.
2. Recharge the AC system with the appropriate refrigerant amount.
3. Reconnect the negative battery terminal and start the engine.
4. Turn on the AC to the maximum setting and monitor performance.