why is my Ford F-150 13th Generation (2015-2020) air conditioning blowing warm air

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

558 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 inspecting the AC system to avoid burns.

Symptoms

•Air conditioning blows warm air instead of cold
•AC compressor does not engage
•Unusual noises from the AC system
•Frost or ice buildup on the evaporator or lines
•Increased humidity inside the cabin
•Poor airflow from vents

Diagnostic Steps

1
Check the refrigerant level using a pressure gauge.
2
Inspect the AC compressor for any visible damage or leaks.
3
Use an OBD-II scanner to check for any related error codes.
4
Verify the operation of the AC clutch by observing if it engages when the AC is turned on.
5
Inspect the cabin air filter for blockage or dirt.
6
Examine the AC system fuses and relays for continuity.

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

•AC pressure gauge
•Refrigerant canister and hose
•Visual inspection tools
•Screwdriver

Parts Required

•Refrigerant (R-134a or as specified)
•Cabin air filter
•AC compressor (if needed)

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Diagnostic Steps

1
Check the refrigerant level using a pressure gauge.
2
Inspect the AC compressor for any visible damage or leaks.
3
Use an OBD-II scanner to check for any related error codes.
4
Verify the operation of the AC clutch by observing if it engages when the AC is turned on.
5
Inspect the cabin air filter for blockage or dirt.
6
Examine the AC system fuses and relays for continuity.

Solution

1. Preparation

Gather tools and necessary parts.
Ensure the vehicle is parked on a level surface with the engine off.
Disconnect the battery to prevent electrical shorts.

2. Check Refrigerant Level

Tools Required: AC pressure gauge.
Connect the pressure gauge to the low-pressure service port.
Read the gauge; if the pressure is low, it indicates a refrigerant leak or depletion.
If low, proceed to recharge the system.

3. Recharge Refrigerant

Tools Required: Refrigerant canister and hose.
Remove the cap from the low-pressure service port.
Attach the recharge hose to the port.
Start the engine and turn the AC to maximum setting.
Slowly add refrigerant until the pressure reaches the manufacturer's specifications (usually around 30-40 PSI for low pressure).
Disconnect the hose and replace the cap.

4. Inspect AC Compressor

Tools Required: Visual inspection tools.
Locate the AC compressor and check for any visible signs of damage or oil leaks.
Ensure the compressor is properly mounted and that all electrical connectors are secure.
If damaged, replace the compressor.

5. Replace Cabin Air Filter

Tools Required: Screwdriver (if necessary).
Locate the cabin air filter housing, usually behind the glove compartment.
Remove any screws or clips holding the housing.
Take out the old cabin air filter and install the new one, ensuring correct orientation.
Reassemble the housing.

6. Test the AC System

Reconnect the battery.
Start the engine and turn on the AC to check for cold air.
Monitor the system for any unusual noises or issues.