my Ford F-150 13th Generation (2015-2020) air conditioning stopped blowing cold air

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

596 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

•Disconnect battery before working on electrical systems
•Allow engine to cool before working on the AC components

Symptoms

•Air conditioning blows warm air
•Strange noises from the AC compressor
•Increased humidity inside the cabin
•AC compressor not engaging
•Fluctuating air temperature when AC is on
•"AC Off" light illuminated on the climate control panel

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Check refrigerant level using manifold gauge set
3
Inspect AC compressor for signs of damage or leaks
4
Examine electrical connections related to the AC system for corrosion or damage
5
Test AC relay for proper functionality with a multimeter
6
Check cabin air filter for blockages or excessive dirt

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
•Socket set
•Screwdrivers
•Safety goggles
•Gloves

Parts Required

•Refrigerant (R-134a)
•AC compressor (if needed)
•AC relay (if needed)
•Cabin air filter (if needed)

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Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Check refrigerant level using manifold gauge set
3
Inspect AC compressor for signs of damage or leaks
4
Examine electrical connections related to the AC system for corrosion or damage
5
Test AC relay for proper functionality with a multimeter
6
Check cabin air filter for blockages or excessive dirt

Solution

1. Preparation

Tools Required: OBD-II scanner, manifold gauge set, multimeter, socket set, screwdrivers, safety goggles, gloves.
Disconnect the vehicle's battery to prevent electrical shorts.
Ensure the vehicle is on a level surface and safely secured.

2. Recharge Refrigerant

Step 1: Connect the manifold gauge set to the low and high-pressure ports on the AC system.
Step 2: Start the vehicle and turn on the AC to the maximum setting.
Step 3: Monitor the pressure readings; if low, connect a refrigerant canister to the low-pressure port.
Step 4: Add refrigerant until the proper pressure is achieved as per the vehicle specifications (typically around 30-40 psi on the low side).

3. Replace AC Compressor (if necessary)

Step 1: Remove the serpentine belt by using a socket to release tension on the tensioner pulley.
Step 2: Disconnect electrical connectors from the AC compressor.
Step 3: Remove the bolts securing the AC compressor and detach it from the mounting bracket.
Step 4: Install the new AC compressor by reversing the removal steps, ensuring to torque bolts to manufacturer specifications.

4. Check and Replace AC Relay (if necessary)

Step 1: Locate the AC relay in the fuse box.
Step 2: Remove the relay and test it with a multimeter; replace if faulty.
Step 3: Reinstall the new relay and ensure it clicks into place.

5. Reconnect Battery and Test

Reconnect the vehicle's battery.
Start the vehicle and turn on the AC to verify proper cooling.