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

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

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

632 words

Problem Statement

Learn how to diagnose and fix warm air blowing from AC in Ford F-150 2015-2020. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Always wear safety goggles and gloves when handling refrigerants.

Symptoms

•Warm air blowing from the AC vents
•AC compressor not engaging
•Unusual noises from the AC system
•Ice buildup on the evaporator or refrigerant lines
•Foul odor coming from the vents
•Fluctuating air temperature from the vents

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any AC-related trouble codes.
2
Inspect the refrigerant level using a manifold gauge set to determine if it is low or overcharged.
3
Check the AC compressor operation by observing if it engages when the AC is turned on.
4
Examine the AC fuse and relay for continuity and proper operation.
5
Inspect the cabin air filter for blockage or excessive dirt.
6
Verify the operation of the blend door actuator to ensure it is functioning correctly.

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
•AC refrigerant kit
•Wrench set
•Multimeter

Parts Required

•AC refrigerant
•Cabin air filter
•Blend door actuator (if defective)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any AC-related trouble codes.
2
Inspect the refrigerant level using a manifold gauge set to determine if it is low or overcharged.
3
Check the AC compressor operation by observing if it engages when the AC is turned on.
4
Examine the AC fuse and relay for continuity and proper operation.
5
Inspect the cabin air filter for blockage or excessive dirt.
6
Verify the operation of the blend door actuator to ensure it is functioning correctly.

Solution

1. Preparation

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

2. Check Refrigerant Level

Tools Required: Manifold gauge set
Connect the high and low-pressure gauges to the AC service ports.
Start the engine and turn on the AC to the max setting.
Read the pressure levels on the gauges. If low, proceed to recharge; if high, further investigate for blockages.

3. Recharge the AC System (if low)

Tools Required: AC refrigerant kit
Locate the low-pressure service port (usually on the larger line).
Attach the refrigerant canister to the low-pressure port.
Open the valve and allow refrigerant to flow into the system until the correct pressure is reached, monitoring with the gauges.
Disconnect the refrigerant canister.

4. Inspect AC Compressor

Tools Required: Wrench set
Locate the AC compressor and check the electrical connector for damage.
Use a multimeter to check for power at the compressor when the AC is turned on.
If no power, trace back to the fuses and relay. Replace any defective components.

5. Replace Cabin Air Filter

Tools Required: None (usually hand tools required for some models)
Open the glove compartment and remove it.
Locate the cabin air filter housing and remove the old filter.
Insert a new cabin air filter, ensuring it is oriented correctly.

6. Test Blend Door Actuator

Tools Required: Scan tool for testing actuators
Use a scan tool to access the HVAC control module.
Command the blend door actuator to move and ensure it responds correctly.
If it does not move as expected, replace the blend door actuator.