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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

598 words

Problem Statement

Learn how to diagnose and fix AC blowing hot air in Ford F-150 2015-2020. Step-by-step guide with diagnostic procedures 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 systems
•Wear safety goggles and gloves when handling refrigerants

Symptoms

•AC blows hot air regardless of temperature setting
•Check AC warning light illuminated
•Unusual noises from the AC compressor
•Poor airflow from the vents
•Increased engine temperature
•Freon leakage or visible oil stains around AC components

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any AC-related faults
2
Check the refrigerant level to ensure it is within the manufacturer's specifications
3
Inspect the AC compressor for signs of damage or failure, including any unusual noises
4
Verify the function of the AC control module and climate control settings
5
Check for blockages in the cabin air filter that could restrict airflow
6
Inspect the blend door actuator for proper operation, ensuring it directs air appropriately

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
•Refrigerant gauge
•Basic hand tools
•Flashlight
•Screwdrivers
•Socket set
•Diagnostic tool

Parts Required

•Refrigerant
•New cabin air filter
•Blend door actuator (if faulty)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any AC-related faults
2
Check the refrigerant level to ensure it is within the manufacturer's specifications
3
Inspect the AC compressor for signs of damage or failure, including any unusual noises
4
Verify the function of the AC control module and climate control settings
5
Check for blockages in the cabin air filter that could restrict airflow
6
Inspect the blend door actuator for proper operation, ensuring it directs air appropriately

Solution

1. Preparation

Tools Required: OBD-II scanner, refrigerant gauge, basic hand tools, flashlight
Disconnect the negative battery terminal to ensure safety during service.

2. Check Refrigerant Levels

Sub-steps:
- Connect the refrigerant gauge to the low-pressure service port.
- Read the gauge and compare it to the manufacturer's specifications (typically between 30-40 psi for low side).
- If low, add refrigerant as necessary using a refrigerant refill kit.
Safety Warning: Wear safety goggles and gloves when handling refrigerant; follow proper disposal procedures for old refrigerant.

3. Inspect AC Compressor

Sub-steps:
- Visually inspect the compressor for any signs of leaks or physical damage.
- Start the engine and activate the AC. Check if the compressor engages; listen for any unusual noises.
- If the compressor does not engage, test the electrical connections and fuses associated with the AC system.
Safety Warning: Ensure the engine is running and the AC is on during this inspection.

4. Verify Blend Door Operation

Sub-steps:
- Remove the dashboard panel to access the blend door actuator (refer to service manual for details).
- Connect the vehicle's diagnostic tool and command the actuator to move through its range.
- Ensure the actuator is functioning properly and the blend door is moving freely. Replace the actuator if it is faulty.
Tools Required: Screwdrivers, socket set, diagnostic tool

5. Replace Cabin Air Filter (if obstructed)

Sub-steps:
- Locate and remove the cabin air filter cover (usually found behind the glove box).
- Remove the old cabin air filter and inspect for debris or blockages.
- Install a new cabin air filter, ensuring proper orientation.
Parts Required: New cabin air filter