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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

540 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 battery before working on electrical systems.
•Use proper ventilation when handling refrigerants.

Symptoms

•AC system blowing hot air
•AC compressor not engaging
•Unusual noises from the AC system
•Poor airflow from vents
•High-pressure reading on the AC gauge
•Low refrigerant level

Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'Max AC' or 'Cold.'
2
Scan the vehicle for any fault codes using an OBD-II scanner.
3
Inspect the AC compressor for physical damage and ensure it is engaging when the AC is turned on.
4
Check the refrigerant level using a gauge; look for low pressure.
5
Inspect for leaks in the AC system using dye or electronic leak detector.
6
Test the AC relay and fuses to ensure they are functioning properly.

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 set
•Refrigerant canister
•Socket set
•Torque wrench
•Multimeter
•Serpentine belt tool
•Fuse puller

Parts Required

•Refrigerant
•AC compressor (if defective)
•AC relay/fuses (if defective)

Related Faults

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Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'Max AC' or 'Cold.'
2
Scan the vehicle for any fault codes using an OBD-II scanner.
3
Inspect the AC compressor for physical damage and ensure it is engaging when the AC is turned on.
4
Check the refrigerant level using a gauge; look for low pressure.
5
Inspect for leaks in the AC system using dye or electronic leak detector.
6
Test the AC relay and fuses to ensure they are functioning properly.

Solution

1. Preparation

Gather tools and parts.
Disconnect the vehicle battery to ensure safety.
Wear safety goggles and gloves.

2. Recharge Refrigerant

Tools Required: Refrigerant gauge set, refrigerant canister.
Connect the low-pressure gauge to the low-pressure service port.
If the reading is low, connect a refrigerant canister and slowly add refrigerant until the correct level is reached (typically around 30-40 psi).
Monitor the high-pressure gauge to ensure it remains within standard specifications (approximately 200-250 psi).

3. Inspect and Replace AC Compressor

Tools Required: Socket set, torque wrench, serpentine belt tool.
Remove the serpentine belt by loosening the tensioner and sliding the belt off the AC compressor pulley.
Disconnect the electrical connector from the AC compressor and remove the mounting bolts.
Inspect the compressor for signs of wear or damage; replace if necessary.
Install the new compressor and torque the mounting bolts to the manufacturer’s specifications.

4. Check and Replace AC Relay/Fuses

Tools Required: Multimeter, fuse puller.
Locate the fuse box and check the AC relay and associated fuses for continuity using a multimeter.
Replace any faulty fuses or relays with ones that match the specifications.

5. Reassemble and Test

Reattach the serpentine belt, ensuring it is correctly aligned.
Reconnect the battery and start the vehicle.
Turn on the AC and observe if cold air is now being produced.