why is my Ford Explorer 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

511 words

Problem Statement

Learn how to diagnose and fix hissing noise when AC is activated in Ford Explorer. 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 systems.
•Ensure proper handling and disposal of refrigerants to avoid environmental harm.

Symptoms

•Hissing noise when AC is turned on
•Reduced cooling performance
•AC compressor cycling on and off frequently
•Presence of refrigerant leaks (visible oil spots)
•Increased humidity inside the cabin

Diagnostic Steps

1
Inspect the AC system for visible signs of refrigerant leaks, such as oil spots around hoses and fittings.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Check the AC compressor's operation by listening for engagement and disengagement sounds.
4
Measure the refrigerant pressure with a gauge set to determine if it is within the manufacturer's specifications.
5
Inspect the AC expansion valve or orifice tube for blockages or malfunctions.
6
Verify the condition of the AC condenser for any physical damage or obstructions.

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
•Refrigerant recovery machine
•Refrigerant charging machine
•Wrench set
•Socket set

Parts Required

•AC compressor (if faulty)
•Expansion valve or orifice tube (if blocked)

Related Faults

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Diagnostic Steps

1
Inspect the AC system for visible signs of refrigerant leaks, such as oil spots around hoses and fittings.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Check the AC compressor's operation by listening for engagement and disengagement sounds.
4
Measure the refrigerant pressure with a gauge set to determine if it is within the manufacturer's specifications.
5
Inspect the AC expansion valve or orifice tube for blockages or malfunctions.
6
Verify the condition of the AC condenser for any physical damage or obstructions.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety.
Allow the engine to cool down before proceeding.

2. Recover and Evacuate Refrigerant

Use a refrigerant recovery machine to safely recover the refrigerant from the AC system.
Follow the manufacturer's guidelines for evacuation to remove moisture and contaminants.
Tools Required: Refrigerant recovery machine.

3. Inspect and Replace AC Components

3.1 Inspect AC Compressor

Check for signs of wear or failure.
If faulty, remove the AC compressor:
- Disconnect electrical connectors.
- Remove the refrigerant lines and mounting bolts.
- Replace with a new unit, ensuring proper alignment.

3.2 Replace Expansion Valve/Orifice Tube

Locate the expansion valve or orifice tube in the refrigerant line.
Remove the component:
- Disconnect refrigerant lines.
- Replace with a new valve or tube.
Tools Required: Wrench set, socket set.

4. Recharge AC System

Reconnect the refrigerant lines and electrical connectors.
Use a refrigerant charging machine to recharge the AC system with the appropriate refrigerant type.
Tools Required: Refrigerant charging machine.

5. Final Checks

Reconnect the battery.
Start the engine and run the AC to ensure proper operation.
Listen for any unusual noises and monitor for leaks.