my Ford F-150 13th Generation (2015-2020) AC is blowing warm air what’s wrong

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

525 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 the battery before working on electrical components.
•Allow the engine to cool before working on the AC system.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Increased cabin humidity
•Unusual noises from the AC system
•AC blower fan operates but no cooling occurs

Diagnostic Steps

1
Check the AC system pressure using a manifold gauge set.
2
Inspect the AC compressor for proper engagement and operation.
3
Examine the AC refrigerant level and look for any signs of leaks.
4
Test the AC control settings and ensure they are set to the cool position.
5
Inspect the cabin air filter for clogs or restrictions.
6
Scan for any trouble codes using an OBD-II scanner 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 recharge kit
•Multimeter
•Socket set
•Screwdrivers

Parts Required

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

Related Faults

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Diagnostic Steps

1
Check the AC system pressure using a manifold gauge set.
2
Inspect the AC compressor for proper engagement and operation.
3
Examine the AC refrigerant level and look for any signs of leaks.
4
Test the AC control settings and ensure they are set to the cool position.
5
Inspect the cabin air filter for clogs or restrictions.
6
Scan for any trouble codes using an OBD-II scanner related to the AC system.

Solution

1. Preparation

Gather tools and parts needed for repair.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the negative battery terminal to prevent any electrical issues.

2. Check Refrigerant Levels

Use a manifold gauge set to connect to the low and high-pressure service ports.
Check the readings; if low, proceed to recharge the system.
If pressure is low, locate and repair any leaks before recharging.

3. Inspect and Replace AC Compressor

If the compressor is not engaging, locate the electrical connector and check for voltage using a multimeter.
If the compressor is faulty, remove the drive belt and unbolt the compressor from its mounting.
Replace with a new compressor, ensuring to add the appropriate amount of oil specified by the manufacturer.

4. Check and Replace Cabin Air Filter

Locate the cabin air filter access panel, usually found behind the glove box.
Remove the old filter and inspect for dirt or blockages.
Install a new cabin air filter, ensuring it is properly seated.

5. Recharge the AC System

If refrigerant was low, use an AC recharge kit to add refrigerant. Follow the specifications for the correct type and amount (usually R-134a).
Monitor the gauge readings to ensure they fall within the normal operating range.