why is my Ford Explorer Fifth Generation (2011-2019) making a hissing sound when I turn on the AC?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

559 words

Problem Statement

Learn how to diagnose and fix the hissing sound in the AC system of your Ford Explorer (2011-2019). Step-by-step guide with tools 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 systems.
•Allow the engine to cool before inspecting the AC components.

Symptoms

•Hissing sound when AC is turned on
•Reduced cooling performance
•Possible refrigerant leak
•Moisture inside the vehicle
•AC system cycling on and off rapidly

Diagnostic Steps

1
Inspect the AC system for visible refrigerant leaks, particularly around the condenser, evaporator, and hose connections.
2
Use an AC manifold gauge set to check the refrigerant pressures in the system.
3
Listen closely around the AC compressor and expansion valve for abnormal noises while the AC is running.
4
Check the cabin air filter for blockages that might affect airflow and cause unusual sounds.
5
Inspect the AC clutch for proper engagement and listen for any abnormal sounds during 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

•Safety goggles
•Gloves
•Flashlight
•AC manifold gauge set
•Refrigerant leak detector

Parts Required

•Replacement hoses (if leaks are found)
•AC compressor (if faulty)
•Expansion valve (if required)

Related Faults

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Diagnostic Steps

1
Inspect the AC system for visible refrigerant leaks, particularly around the condenser, evaporator, and hose connections.
2
Use an AC manifold gauge set to check the refrigerant pressures in the system.
3
Listen closely around the AC compressor and expansion valve for abnormal noises while the AC is running.
4
Check the cabin air filter for blockages that might affect airflow and cause unusual sounds.
5
Inspect the AC clutch for proper engagement and listen for any abnormal sounds during operation.

Solution

1. Preparation

Tools Required: Safety goggles, gloves, flashlight, AC manifold gauge set, refrigerant leak detector.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to avoid any electrical issues while working on the AC system.

2. Inspect for Refrigerant Leaks

Sub-steps:
- Use a flashlight to visually inspect all AC components for oil residue, which indicates a refrigerant leak.
- Apply a refrigerant leak detector around suspected areas, including fittings, hoses, and the compressor.
- Mark any areas with signs of leakage for repair.

3. Check Refrigerant Levels

Sub-steps:
- Connect the AC manifold gauges to the high and low-pressure ports of the AC system.
- Start the engine and turn the AC to maximum cooling.
- Observe the pressure readings on the gauges; they should be within the manufacturer's specified range.
- If pressures are low, this indicates a refrigerant leak which must be addressed.

4. Repair or Replace Faulty Components

Sub-steps:
- If leaks are found, replace the affected components (e.g., hoses, compressor).
- If the expansion valve is suspected to be faulty, it may need to be replaced.
- After replacing components, evacuate the system using a vacuum pump to remove moisture and air.
- Recharge the system with the correct type and amount of refrigerant.

5. Test the AC System

Sub-steps:
- Reconnect the battery after repairs are complete.
- Start the engine and turn on the AC system.
- Monitor for any hissing sounds and check the cooling performance.
- Ensure all components are functioning correctly and that no leaks are present.