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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

612 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Wear safety goggles and gloves when handling refrigerants and sharp components.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Unusual noises from the AC system
•Decreased airflow from vents
•AC warning light illuminated on the dashboard

Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'max cold.'
2
Inspect the AC compressor for any visible damage or leaks.
3
Use an OBD-II scanner to check for any diagnostic trouble codes related to the AC system.
4
Measure the refrigerant pressure using a manifold gauge set to determine if the system is under or overcharged.
5
Inspect the AC condenser for blockages or debris that may impede airflow.
6
Check the cabin air filter for clogs that could restrict airflow.

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
•Basic hand tools
•Safety goggles
•Gloves
•Multimeter

Parts Required

•Refrigerant (R-134a or R-1234yf depending on system)
•AC compressor (if needed)
•Cabin air filter

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Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'max cold.'
2
Inspect the AC compressor for any visible damage or leaks.
3
Use an OBD-II scanner to check for any diagnostic trouble codes related to the AC system.
4
Measure the refrigerant pressure using a manifold gauge set to determine if the system is under or overcharged.
5
Inspect the AC condenser for blockages or debris that may impede airflow.
6
Check the cabin air filter for clogs that could restrict airflow.

Solution

1. Preparation

Tools Required: OBD-II scanner, manifold gauge set, basic hand tools, safety goggles, gloves.
Disconnect the negative battery terminal to ensure safety.

2. Check and Recharge Refrigerant

Connect the manifold gauge set to the AC service ports (low and high).
Read the pressure on both gauges:
- If low, this indicates a refrigerant leak or low levels.
- If high, this may indicate a blockage.
If the refrigerant is low, proceed to recharge:
- Attach the refrigerant can to the low-pressure side of the manifold gauge.
- Open the valve on the refrigerant can and allow the system to draw in the refrigerant until the appropriate pressure is reached (refer to manufacturer specifications).
Recheck the system operation after recharging.

3. Inspect and Replace Components

If the compressor is not engaging after recharging, check the electrical connections:
- Ensure the AC clutch connector is secure and the wiring is intact.
- Test the compressor clutch with a multimeter to confirm it is receiving power.
If the compressor is faulty, replace it:
- Remove the serpentine belt and disconnect the compressor from the AC lines.
- Install the new compressor and reconnect the lines, ensuring seals are replaced to prevent leaks.
- Reinstall the serpentine belt.

4. Clean or Replace Cabin Air Filter

Locate the cabin air filter housing, usually behind the glove compartment.
Remove the glove compartment to gain access.
Take out the existing air filter and inspect it for dirt and debris.
Clean the housing with a vacuum or replace with a new filter as necessary.

5. Verify System Functionality

Reconnect the negative battery terminal.
Start the vehicle and set the AC to max cold.
Monitor the air temperature and ensure it is blowing cold air.