why is my Ford F-150 13th Generation (2015-2020) AC compressor not turning on

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

627 words

Problem Statement

Learn how to diagnose and fix the AC compressor not turning on in a 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.
•Allow engine to cool before servicing components near the engine.

Symptoms

•AC compressor does not engage when AC is turned on
•No cold air blowing from the vents
•Possible check engine light illuminated
•Unusual noises from the engine bay (if applicable)
•Increased cabin humidity

Diagnostic Steps

1
Check the AC system for refrigerant levels using a manifold gauge set.
2
Inspect the AC fuse and relay in the fuse box for any blown fuses or faulty relays.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Inspect the AC compressor clutch for signs of damage or wear.
5
Verify that the AC switch is functioning properly by testing for voltage at the compressor connector.
6
Check for any electrical issues, including damaged wires or connectors leading to the compressor.

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

•Manifold gauge set
•OBD-II scanner
•Multimeter
•Socket set
•Puller tool

Parts Required

•AC refrigerant (R-134a)
•AC fuse/relay (if needed)
•Replacement AC compressor clutch (if needed)

Related Faults

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Diagnostic Steps

1
Check the AC system for refrigerant levels using a manifold gauge set.
2
Inspect the AC fuse and relay in the fuse box for any blown fuses or faulty relays.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Inspect the AC compressor clutch for signs of damage or wear.
5
Verify that the AC switch is functioning properly by testing for voltage at the compressor connector.
6
Check for any electrical issues, including damaged wires or connectors leading to the compressor.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Recharge the AC System (if low on refrigerant)

Tools Required: Manifold gauge set, refrigerant (R-134a for this model)
Remove the service cap from the low-pressure port.
Connect the low-pressure side hose from the manifold gauge set.
Start the engine and turn on the AC to maximum settings.
Add refrigerant slowly while monitoring the gauge until the recommended pressure is reached (typically between 25-45 psi).

3. Replace AC Fuse/Relay (if faulty)

Tools Required: Socket set or screwdriver
Locate the fuse box (usually under the dashboard or in the engine bay).
Identify and remove the AC fuse using the diagram on the fuse box cover.
Inspect the fuse to see if it is blown; replace it with a new fuse of the same amperage.
If the relay is faulty, remove it and replace it with a new relay.

4. Inspect and Repair Electrical Connections

Tools Required: Multimeter, wire brush or electrical contact cleaner
Check the wiring harness and connectors leading to the AC compressor for any visible damage.
Use a multimeter to check for continuity in the wiring.
Clean any corroded connectors with electrical contact cleaner and ensure a secure connection.

5. Replace AC Compressor Clutch (if defective)

Tools Required: Socket set, puller tool, replacement AC compressor clutch
Remove the AC compressor from the engine by disconnecting the mounting bolts and electrical connectors.
Use the puller tool to remove the old clutch from the compressor.
Install the new clutch and reassemble the compressor, ensuring all components are securely fastened.