how to fix 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

4 min read

624 words

Problem Statement

Learn how to diagnose and fix AC not blowing cold 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.
•Avoid inhaling refrigerant; it can be harmful to health.

Symptoms

•AC blowing warm air
•Unusual noises from the AC compressor
•AC compressor not engaging
•Fogging or misting windshield with humidity
•Visible refrigerant leaks
•Intermittent cooling or fluctuating temperatures

Diagnostic Steps

1
Check the AC settings to ensure the temperature is set to the coldest setting and the recirculation mode is activated.
2
Use an OBD-II scanner to check for any error codes related to the HVAC system.
3
Inspect the AC compressor to see if it is engaging when the AC is turned on.
4
Examine the refrigerant levels using a manifold gauge set to determine if the system is low on refrigerant.
5
Inspect the AC condenser for blockages or damage that could obstruct airflow.
6
Check for electrical issues by testing fuses and relays associated with the AC system.

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
•Torque wrench
•Refrigerant can with hose
•Screwdrivers

Parts Required

•Refrigerant (R-134a or R-1234yf)
•AC compressor (if faulty)
•AC o-rings (if compressor is replaced)

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Diagnostic Steps

1
Check the AC settings to ensure the temperature is set to the coldest setting and the recirculation mode is activated.
2
Use an OBD-II scanner to check for any error codes related to the HVAC system.
3
Inspect the AC compressor to see if it is engaging when the AC is turned on.
4
Examine the refrigerant levels using a manifold gauge set to determine if the system is low on refrigerant.
5
Inspect the AC condenser for blockages or damage that could obstruct airflow.
6
Check for electrical issues by testing fuses and relays associated with the AC system.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the negative battery terminal to ensure safety while working on the electrical system.

2. Recharge Refrigerant

Locate the Low-Pressure Service Port
- Find the low-pressure port on the AC system, usually located on the larger diameter refrigerant line.
Connect Manifold Gauge Set
- Attach the blue (low-pressure) hose from the manifold gauge set to the low-pressure service port.
- Ensure the gauges are properly secured and the valves are closed.
Check Refrigerant Level
- Start the engine and turn the AC to the maximum setting.
- Open the low-pressure side valve and monitor the gauge readings.
Add Refrigerant as Necessary
- If the pressure is below the manufacturer's recommended level (typically between 25-45 psi), add the appropriate refrigerant (R-134a or R-1234yf, depending on your model).
- Follow the instructions on the refrigerant can for proper filling and avoid overcharging.

3. Replace AC Compressor (if needed)

Remove the Old Compressor
- Disconnect the electrical connector from the AC compressor.
- Remove the serpentine belt from the AC compressor pulley.
- Use a socket set to remove the mounting bolts securing the compressor to the engine.
- Carefully detach the refrigerant lines (ensure to recover refrigerant if applicable).
Install New Compressor
- Position the new AC compressor in place and secure it with the mounting bolts (torque to manufacturer's specifications).
- Reconnect the refrigerant lines and electrical connector.
Reinstall Serpentine Belt
- Route the serpentine belt back over the AC compressor pulley, ensuring it is correctly aligned with all pulleys.

4. Reconnect Battery and Test

Reconnect the negative battery terminal.
Start the engine and turn on the AC to check for proper operation and cold air flow.