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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

549 words

Problem Statement

Learn how to diagnose and fix AC blowing warm 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 components.
•Wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC system only blowing warm air
•AC compressor not engaging
•Unusual noises from the AC unit during operation
•Condensation on the AC lines is absent or minimal
•Increased cabin humidity

Diagnostic Steps

1
Scan the vehicle's OBD-II system for any error codes related to the AC system.
2
Check the refrigerant level using a gauge to ensure it is within the manufacturer's specifications.
3
Inspect the AC compressor for signs of damage or wear.
4
Verify the operation of the AC clutch by checking for engagement when the AC is turned on.
5
Examine the AC condenser for obstructions or debris that could impede airflow.
6
Test the cabin air filter to see if it is clogged or dirty.

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
•Wrench set
•Flashlight

Parts Required

•Refrigerant (specific type as per vehicle specification)
•Cabin air filter
•AC compressor (if found faulty)

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Diagnostic Steps

1
Scan the vehicle's OBD-II system for any error codes related to the AC system.
2
Check the refrigerant level using a gauge to ensure it is within the manufacturer's specifications.
3
Inspect the AC compressor for signs of damage or wear.
4
Verify the operation of the AC clutch by checking for engagement when the AC is turned on.
5
Examine the AC condenser for obstructions or debris that could impede airflow.
6
Test the cabin air filter to see if it is clogged or dirty.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety during the repair process.
Allow the engine to cool down before working on the AC system.

2. Check Refrigerant Level

Tools Required: Refrigerant gauge set
Connect the low-pressure side of the gauge to the AC system service port.
Read the gauge; if the pressure is low, you may need to add refrigerant.
If the refrigerant is low, locate and repair any leaks before recharging.

3. Inspect AC Compressor

Tools Required: Wrench set, flashlight
Locate the AC compressor; check for any visible damage or leaks.
Manually spin the compressor clutch to ensure it is not seized.
If the compressor is faulty, proceed to replace it.

4. Replace Cabin Air Filter

Tools Required: None specifically
Open the glove compartment and remove it to access the cabin air filter location.
Remove the old filter and install a new one, ensuring it is oriented correctly.

5. Recharge AC System

Tools Required: Refrigerant canister, refrigerant gauge set
Follow the instructions on the refrigerant canister to recharge the system.
Monitor the pressure on the gauge to ensure it reaches the correct level.

6. Reassemble and Test

Reconnect the battery.
Start the engine and turn on the AC to check for cold air.
Monitor the system for proper operation and any unusual noises.