why does my Ford F-150 13th Generation (2015-2020) AC not blow cold 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 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 the battery before working on electrical components.
•Allow the engine to cool before handling any parts related to the AC system.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Unusual noises from the AC system (e.g., hissing or clicking)
•AC system running but not cooling effectively
•Sweet smell inside cabin (possible refrigerant leak)

Diagnostic Steps

1
Check the AC system pressure using a manifold gauge set to determine if refrigerant levels are low.
2
Inspect the AC compressor for proper engagement when the AC is turned on.
3
Examine fuses and relays associated with the AC system for any blown fuses or malfunctioning relays.
4
Look for visible signs of refrigerant leaks around hoses, connections, and the compressor.
5
Test the cabin air filter to ensure it is not clogged and is allowing proper 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

•Manifold gauge set
•Multimeter
•Basic hand tools (screwdrivers, socket set)
•Safety glasses
•Hose clamp pliers

Parts Required

•Refrigerant (R-134a)
•AC compressor (if needed)
•Hoses or seals (if leaks are found)

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Diagnostic Steps

1
Check the AC system pressure using a manifold gauge set to determine if refrigerant levels are low.
2
Inspect the AC compressor for proper engagement when the AC is turned on.
3
Examine fuses and relays associated with the AC system for any blown fuses or malfunctioning relays.
4
Look for visible signs of refrigerant leaks around hoses, connections, and the compressor.
5
Test the cabin air filter to ensure it is not clogged and is allowing proper airflow.

Solution

1. Preparation

Gather tools: manifold gauge set, multimeter, basic hand tools (screwdrivers, socket set), and safety glasses.
Ensure the vehicle is parked on a level surface and the engine is turned off.

2. Charge the AC System

Sub-step 1: Locate the low-pressure service port on the AC system.
Sub-step 2: Connect the blue hose of the manifold gauge set to the low-pressure port.
Sub-step 3: Start the vehicle and turn the AC to the maximum setting.
Sub-step 4: Monitor the pressure readings. If low, add refrigerant according to specifications (R-134a for this model).
Tools Required: Manifold gauge set, refrigerant canister.

3. Inspect and Replace Components

Sub-step 1: If the compressor is not engaging, use a multimeter to check for power at the compressor connector.
Sub-step 2: If no power is present, trace back to the AC relay and the associated fuses. Replace any blown fuses.
Sub-step 3: If power is present but the compressor does not engage, replace the AC compressor.
Tools Required: Multimeter, basic hand tools.

4. Leak Repair

Sub-step 1: If a refrigerant leak is detected, identify the source (hoses, seals, or compressor).
Sub-step 2: Use appropriate sealant or replace damaged components to stop the leak.
Sub-step 3: Recharge the system after repairs are completed.
Tools Required: Hose clamp pliers, replacement hoses/seals as needed.