why does my Ford Explorer make a loud 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

530 words

Problem Statement

Learn to diagnose and fix the loud hissing noise in your Ford Explorer's AC system. 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.
•Allow the vehicle to cool down before inspecting the AC components to avoid burns.

Symptoms

•Loud hissing noise from the AC system
•Reduced cooling performance from the AC
•Possible refrigerant leak in the system
•Ice buildup on the AC evaporator or lines
•AC compressor cycling on and off frequently

Diagnostic Steps

1
Inspect the AC lines and components for visible signs of refrigerant leaks.
2
Use an AC manifold gauge set to check the pressure readings of the system.
3
Listen for the hissing noise while monitoring the AC compressor operation.
4
Check the cabin air filter for clogging, which can restrict airflow.
5
Inspect the expansion valve or orifice tube for blockages or malfunction.

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
•AC manifold gauge set
•UV leak detection kit
•Basic hand tools

Parts Required

•AC condenser
•Refrigerant (R-134a)

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 lines and components for visible signs of refrigerant leaks.
2
Use an AC manifold gauge set to check the pressure readings of the system.
3
Listen for the hissing noise while monitoring the AC compressor operation.
4
Check the cabin air filter for clogging, which can restrict airflow.
5
Inspect the expansion valve or orifice tube for blockages or malfunction.

Solution

1. Preparation

Tools Required: OBD-II scanner, AC manifold gauge set, UV leak detection kit, basic hand tools.
Safely park the vehicle and turn off the engine.
Disconnect the battery to ensure safety while working on electrical components.

2. Inspect for Refrigerant Leaks

Use a UV leak detection kit to identify any leaks in the AC system. Apply UV dye to the system and inspect with a UV light.
If leaks are detected, note the location for repairs.

3. Replace Damaged Components

If a leak is found in the AC condenser or lines:
- Remove the AC condenser:
  - Disconnect the AC lines using a wrench.
  - Unbolt the condenser from its mounting points and remove it from the vehicle.
- Install the new condenser:
  - Position the new condenser in place and secure it with bolts.
  - Reconnect the AC lines, ensuring they are tight and leak-free.

4. Recharge the AC System

Connect the AC manifold gauge set to the high and low-pressure ports.
Use the proper refrigerant type specific to the Ford Explorer (typically R-134a).
Follow the manufacturer’s specifications for the correct refrigerant amount.
Monitor the system pressures and ensure they are within the normal operating range.

5. Final Checks

Reconnect the battery.
Start the vehicle and turn on the AC to test for proper operation and confirm the absence of hissing noise.
Monitor the system for signs of leaks or abnormal noises during operation.