how to fix my Ford F-150 13th Generation (2015-2020) AC not blowing cold air?

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

592 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold air in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, 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.
•Allow engine to cool before working on the AC system.

Symptoms

•AC system does not cool air effectively
•Warm air blowing from vents
•AC compressor not engaging
•Unusual noises from the AC system when activated
•Increased humidity inside the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for potential AC-related trouble codes.
2
Inspect the AC system's refrigerant levels using a manifold gauge set to determine if it is low or overcharged.
3
Check the AC compressor for proper engagement when the AC is turned on.
4
Inspect for visible leaks in the AC lines or components.
5
Verify the operation of the AC compressor relay and fuse.
6
Examine the cabin air filter for clogs that may restrict airflow.

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
•Basic hand tools
•Safety goggles
•Gloves

Parts Required

•R-134a refrigerant
•AC compressor
•Cabin air filter

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for potential AC-related trouble codes.
2
Inspect the AC system's refrigerant levels using a manifold gauge set to determine if it is low or overcharged.
3
Check the AC compressor for proper engagement when the AC is turned on.
4
Inspect for visible leaks in the AC lines or components.
5
Verify the operation of the AC compressor relay and fuse.
6
Examine the cabin air filter for clogs that may restrict airflow.

Solution

1. Preparation

Tools Required: OBD-II scanner, manifold gauge set, basic hand tools, safety goggles, gloves.
Disconnect the vehicle battery to ensure safety during the repair process.

2. Recharge the AC System

Connect Manifold Gauges:
- Attach the low-side and high-side service hoses of the manifold gauge set to the respective service ports on the AC system.
Check Refrigerant Levels:
- With the engine running and AC set to max, read the pressure gauges. Low pressure indicates a need for refrigerant.
Add Refrigerant:
- If low, use a refrigerant canister to add the appropriate R-134a refrigerant to the low-side port, following the manufacturer's specifications.
- Monitor pressures to ensure they remain within the normal range (typically 25-45 psi on the low side).

3. Replace the AC Compressor (if necessary)

Remove the Old Compressor:
- Disconnect electrical connectors and remove the drive belt from the compressor.
- Remove the mounting bolts securing the compressor to the engine and take it out.
Install New Compressor:
- Position the new compressor in place, securing it with the mounting bolts to the specified torque (usually around 20-25 ft-lbs).
- Reconnect the electrical connectors and reinstall the drive belt.

4. Replace Cabin Air Filter (if necessary)

Locate the Filter:
- Access the cabin air filter, usually located behind the glove compartment.
Remove and Replace:
- Remove the old filter and clean any debris from the housing.
- Install the new cabin air filter according to the airflow direction indicated on the filter.

5. Final Checks

Reconnect Battery:
- Reconnect the vehicle battery.
Test AC Operation:
- Start the engine and turn on the AC to ensure cold air is blowing from the vents.