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

539 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 the electrical components.
•Wear safety goggles and gloves when handling refrigerants to prevent injury.

Symptoms

•Air conditioning system blows only hot air
•AC compressor does not engage
•Loud clicking noise from the AC system (if applicable)
•Weak air flow from vents
•AC control panel lights may flicker or not respond

Diagnostic Steps

1
Inspect the AC control settings to ensure they are correctly set to the coldest temperature.
2
Check the refrigerant level in the AC system using a refrigerant gauge.
3
Scan the vehicle's onboard computer for any diagnostic trouble codes (DTCs) related to the AC system.
4
Inspect the AC compressor visually for signs of damage or wear.
5
Check the AC fuses and relays in the fuse box for malfunction.
6
Test the AC pressure switch to verify proper operation.

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

•Refrigerant gauge
•AC recharge kit
•Safety glasses
•Gloves
•Socket set
•Wrench set
•Torque wrench
•Multimeter
•Fuse puller

Parts Required

•Refrigerant (R-134a or R-1234yf as applicable)
•AC compressor (if faulty)
•AC fuses/relays (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the AC control settings to ensure they are correctly set to the coldest temperature.
2
Check the refrigerant level in the AC system using a refrigerant gauge.
3
Scan the vehicle's onboard computer for any diagnostic trouble codes (DTCs) related to the AC system.
4
Inspect the AC compressor visually for signs of damage or wear.
5
Check the AC fuses and relays in the fuse box for malfunction.
6
Test the AC pressure switch to verify proper operation.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to ensure safety during repairs.

2. Refrigerant Recharge

Tools Required: Refrigerant gauge, AC recharge kit, safety glasses, gloves.
Check the refrigerant level using the gauge; if low, connect the recharge kit to the low-pressure port.
Follow the manufacturer’s instructions to add the appropriate refrigerant until the correct pressure is reached.
Disconnect the recharge kit and check for leaks.

3. AC Compressor Inspection and Replacement

Tools Required: Socket set, wrench set, torque wrench, AC compressor removal tool.
Locate the AC compressor and visually inspect for damage or leaks.
If the compressor is faulty:
1. Remove the serpentine belt by loosening the tensioner.
2. Disconnect the electrical connector from the compressor.
3. Remove the mounting bolts and take out the compressor.
4. Install the new compressor, ensuring it is properly aligned.
5. Reconnect the electrical connector and reinstall the serpentine belt.

4. Replace AC Fuses/Relays

Tools Required: Multimeter, fuse puller.
Locate the fuse box and identify the AC fuses and relays.
Use a multimeter to test for continuity; replace any blown fuses or faulty relays.

5. Reconnect Battery and Test

Reconnect the vehicle battery.
Start the vehicle and set the AC to maximum cooling; confirm that cold air is now blowing.