why does my Ford Explorer make a hissing noise when I turn the AC on

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

576 words

Problem Statement

Learn how to diagnose and fix the hissing noise when AC is turned on in Ford Explorer. 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 starting work on the electrical components.
•Always wear safety glasses and gloves when working with refrigerants.

Symptoms

•Hissing noise when AC is turned on
•Decreased cooling efficiency
•Intermittent fluctuations in airflow
•Possible refrigerant leak (evident by reduced refrigerant level)
•AC compressor cycling on and off frequently

Diagnostic Steps

1
Inspect the AC system for visible refrigerant leaks, focusing on hoses and connections.
2
Use an AC manifold gauge set to measure the pressure in the system.
3
Check the AC compressor operation by observing the engagement and disengagement cycles.
4
Listen for noise location by using a mechanic’s stethoscope or similar tool to pinpoint the source of the hissing sound.
5
Inspect the cabin air filter for blockages that may affect airflow.
6
Examine the expansion valve or orifice tube for blockages or damage.

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

•AC manifold gauge set
•Mechanic’s stethoscope
•Refrigerant recovery machine
•Vacuum pump
•UV light (optional)

Parts Required

•Refrigerant (R-134a or as specified)
•Expansion valve or orifice tube (if necessary)
•Sealing washers or O-rings (as needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the AC system for visible refrigerant leaks, focusing on hoses and connections.
2
Use an AC manifold gauge set to measure the pressure in the system.
3
Check the AC compressor operation by observing the engagement and disengagement cycles.
4
Listen for noise location by using a mechanic’s stethoscope or similar tool to pinpoint the source of the hissing sound.
5
Inspect the cabin air filter for blockages that may affect airflow.
6
Examine the expansion valve or orifice tube for blockages or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Leaks

Tools Required: AC leak detection dye (optional), UV light (if dye is used), refrigerant recovery machine.
Use the AC manifold gauge to check system pressures; if pressures are low, proceed with leak detection.
If a leak is suspected, introduce UV dye into the system and run the AC for 10-15 minutes.
Inspect all components for dye leaks using a UV light. Repair or replace any leaky components (hoses, seals, or the compressor).

3. Replace Refrigerant

Tools Required: Refrigerant recovery machine, vacuum pump, refrigerant scale.
If the system is low on refrigerant, recover the remaining refrigerant from the system using a recovery machine.
Connect the vacuum pump to the system to evacuate any moisture and air. Run the pump for at least 30 minutes.
Weigh in the correct amount of refrigerant according to the manufacturer specifications, using the scale.

4. Check and Replace the Expansion Valve/Orifice Tube

Tools Required: Socket set, wrenches.
Locate the expansion valve or orifice tube in the AC system. Remove any components obstructing access to it.
Disconnect the valve/tube and inspect for blockages or damage.
Replace with a new expansion valve or orifice tube if necessary, ensuring all seals are properly seated.

5. Reassemble and Test

Reinstall any removed components and ensure all connections are secure.
Reconnect the negative battery terminal.
Start the vehicle and turn on the AC to check for proper operation and confirm the absence of the hissing noise.