why is my Ford Explorer Fifth Generation (2011-2019) making a hissing noise 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

560 words

Problem Statement

Learn how to diagnose and fix the hissing noise when AC is activated in Ford Explorer (2011-2019). 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

•Always disconnect the battery before working on electrical systems.
•Handle refrigerants with care and follow local regulations for recovery and disposal.

Symptoms

•Hissing noise from the AC system when turned on
•Decreased cooling efficiency
•Possible fluctuating air temperature from the vents
•Condensation buildup around the AC components
•Check engine light illuminated (if related to AC performance)

Diagnostic Steps

1
Inspect the AC system for visible signs of refrigerant leaks, particularly around hoses and fittings.
2
Use an OBD-II scanner to check for any error codes related to the HVAC system.
3
Measure the refrigerant pressure using a manifold gauge set to determine if it is within the manufacturer's specifications.
4
Listen near the AC compressor for abnormal sounds when the system is running.
5
Check the operation of the AC compressor clutch to ensure it engages and disengages properly.

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
•Refrigerant recovery machine
•Wrench set

Parts Required

•AC compressor (if faulty)
•AC hoses (if leaking)
•Refrigerant (R-134a)

Related Faults

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Diagnostic Steps

1
Inspect the AC system for visible signs of refrigerant leaks, particularly around hoses and fittings.
2
Use an OBD-II scanner to check for any error codes related to the HVAC system.
3
Measure the refrigerant pressure using a manifold gauge set to determine if it is within the manufacturer's specifications.
4
Listen near the AC compressor for abnormal sounds when the system is running.
5
Check the operation of the AC compressor clutch to ensure it engages and disengages properly.

Solution

1. Preparation

Gather tools and parts needed for repair.
Disconnect the vehicle battery to ensure safety while working on the electrical components.

2. Inspect and Replace Leaking Components

Tools Required: Wrench set, refrigerant recovery machine, manifold gauge set
Sub-steps:
1. Locate the source of the hissing noise, which may indicate a refrigerant leak (common locations include hoses and the compressor).
2. If a leak is found, mark the area and prepare to replace the affected component (e.g., hose, compressor).
3. Recover the refrigerant using a recovery machine to prevent environmental harm.
4. Disconnect the faulty component by loosening the clamps and fittings.
5. Install the new part in reverse order, ensuring all connections are tight to prevent future leaks.

3. Recharge the AC System

Tools Required: Manifold gauge set, refrigerant (R-134a)
Sub-steps:
1. Connect the manifold gauge set to the AC service ports (high and low side).
2. Open the valves to allow refrigerant to flow into the system. Monitor the readings on the gauges.
3. Follow the manufacturer's specifications for the amount of refrigerant to add.
4. Close the valves and disconnect the manifold gauge set once the proper level is reached.

4. Test the System

Tools Required: None
Sub-steps:
1. Reconnect the vehicle battery.
2. Start the engine and turn on the AC system to the maximum setting.
3. Monitor for any abnormal sounds and check the cooling performance.