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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

476 words

Problem Statement

Complete guide to fixing AC that blows warm air in Ford F-150 (2015-2020). Includes symptoms, diagnostic steps, tools required, and repair procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•AC system makes unusual noises when engaged
•AC compressor does not engage
•Refrigerant leak visible under the vehicle
•Warm air continues to flow through the vents regardless of temperature settings
•AC control panel lights may flicker or not respond

Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'Max AC' or 'Cool.'
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor visually to determine if it is turning on and functioning properly.
4
Check the refrigerant level using a manifold gauge set.
5
Inspect for any visible refrigerant leaks in the AC lines and components.
6
Test the AC relay and fuses for 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

•OBD-II scanner
•Manifold gauge set
•Socket set
•Screwdrivers
•UV leak detection kit (optional)

Parts Required

•Refrigerant (R-134a or R-1234yf)
•AC compressor (if replacing)
•AC relay or fuses (if needed)

Related Faults

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Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'Max AC' or 'Cool.'
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor visually to determine if it is turning on and functioning properly.
4
Check the refrigerant level using a manifold gauge set.
5
Inspect for any visible refrigerant leaks in the AC lines and components.
6
Test the AC relay and fuses for proper operation.

Solution

1. Preparation

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

2. Inspect and Recharge Refrigerant

Check Refrigerant Level
- Connect the manifold gauge set to the AC service ports.
- Read the low and high-pressure gauges to assess refrigerant levels.
Recharge Refrigerant if Low
- If levels are low, add the appropriate refrigerant (R-134a or R-1234yf depending on your vehicle model).
- Follow the manufacturer’s specifications for the correct amount.

3. Replace Faulty Components

Replace AC Compressor (if necessary)
- Remove the serpentine belt using a socket and ratchet.
- Disconnect the electrical connector from the AC compressor.
- Remove the mounting bolts and carefully take out the compressor.
- Install the new compressor, ensuring it is bolted securely and connected properly.
Replace AC Relay or Fuse (if necessary)
- Locate the AC relay in the fuse box (refer to the owner's manual for exact location).
- Remove the faulty relay and replace it with a new one.
- Check and replace any blown fuses related to the AC system.

4. Check and Repair Leaks

Locate and Repair Leaks
- Use UV dye or electronic leak detector to find leaks in the AC system.
- Repair or replace any damaged AC lines, evaporators, or condenser as required.

5. Reassemble and Test

Reconnect the battery and start the vehicle.
Turn on the AC system and monitor for cold air output.

Tools Required:

OBD-II scanner
Manifold gauge set
Socket set
Screwdrivers
UV leak detection kit (optional)

Parts Required:

Refrigerant (R-134a or R-1234yf)
AC compressor (if replacing)
AC relay or fuses (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

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