why does my Ford F-150 13th Generation (2015-2020) AC blow warm air only

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

582 words

Problem Statement

Complete guide to fixing AC that blows warm air in Ford F-150 (2015-2020). Includes symptoms, diagnostic steps, tools required, and repair procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always wear safety goggles when working with refrigerants.
•Disconnect the battery before working on electrical components.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Unusual noises from the AC system (e.g., hissing or clicking sounds)
•Poor airflow from the AC vents
•AC system cycling on and off frequently
•Check engine light illuminated (if applicable)

Diagnostic Steps

1
Check the refrigerant level using a manifold gauge set to determine if it is low.
2
Inspect the AC compressor for proper engagement and operation.
3
Verify if the AC relay is functioning by testing for continuity.
4
Inspect the cabin air filter for clogs or restrictions.
5
Check for any visible leaks in the AC system lines or components.
6
Scan the vehicle's computer for fault codes related to the AC system.

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
•AC refrigerant
•Multimeter
•Socket set
•Safety goggles

Parts Required

•AC refrigerant
•Cabin air filter
•AC compressor (if faulty)
•AC relay (if faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the refrigerant level using a manifold gauge set to determine if it is low.
2
Inspect the AC compressor for proper engagement and operation.
3
Verify if the AC relay is functioning by testing for continuity.
4
Inspect the cabin air filter for clogs or restrictions.
5
Check for any visible leaks in the AC system lines or components.
6
Scan the vehicle's computer for fault codes related to the AC system.

Solution

1. Preparation

Gather tools and materials: Manifold gauge set, AC refrigerant, multimeter, socket set, and safety goggles.
Ensure the vehicle is parked on a level surface and the engine is off.

2. Check Refrigerant Level

Step 1: Connect the manifold gauge set to the low and high-pressure service ports on the AC system.
Step 2: Start the engine and turn the AC on to the maximum setting.
Step 3: Read the pressure gauges; if low, proceed to recharge the system.

3. Recharge AC System

Step 1: If refrigerant is low, connect a can of R-134a refrigerant to the low-pressure side.
Step 2: Open the valve slowly and monitor the pressure; fill until the correct pressure is reached.
Step 3: Disconnect the canister and close the service ports.

4. Inspect AC Compressor

Step 1: Locate the AC compressor and visually inspect for signs of damage or leaks.
Step 2: Use a multimeter to check for voltage at the compressor connector while the AC is on.
Step 3: If no voltage is present, check the relay and fuses in the fuse box.

5. Replace Cabin Air Filter (if necessary)

Step 1: Open the glove box and remove it to access the cabin air filter compartment.
Step 2: Remove the old cabin air filter and replace it with a new one.
Step 3: Reassemble the glove box.

6. Repair or Replace Faulty Components

Step 1: If any components (compressor, relay, or pressure switch) are found to be faulty, replace them according to manufacturer specifications.
Step 2: Ensure all fittings are tight and recheck for leaks after repairs.