my Ford Explorer Fifth Generation (2011-2019) makes a hissing noise when I turn on the AC, what’s wr...

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 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

•Disconnect the battery before working on electrical components.
•Ensure the vehicle is turned off and cooled down before inspecting the AC system.

Symptoms

•Hissing noise when AC is turned on
•Decreased cooling performance
•Possible refrigerant leak
•AC system cycling on and off frequently
•Moisture or frost on AC components

Diagnostic Steps

1
Inspect the AC system for visible refrigerant leaks, particularly around hoses and connections.
2
Use an OBD-II scanner to check for any related error codes that might indicate AC system issues.
3
Check the refrigerant level using a manifold gauge set to determine if it is low.
4
Listen for any abnormal sounds from the AC compressor during operation.
5
Inspect 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
•Multimeter
•Leak detection kit (dye or detector)

Parts Required

•AC hoses or seals (if leaks are found)
•Refrigerant

Related Faults

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Diagnostic Steps

1
Inspect the AC system for visible refrigerant leaks, particularly around hoses and connections.
2
Use an OBD-II scanner to check for any related error codes that might indicate AC system issues.
3
Check the refrigerant level using a manifold gauge set to determine if it is low.
4
Listen for any abnormal sounds from the AC compressor during operation.
5
Inspect the AC compressor clutch to ensure it engages and disengages properly.

Solution

1. Preparation

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

2. Identify and Repair Leaks

Tools Required: Leak detection dye, UV light (optional).
Check for leaks using a UV dye or refrigerant leak detector.
If a leak is found at a joint or hose, replace the affected component.
- Sub-steps:
  1. If using dye, add it to the AC system and run the AC for 10-15 minutes.
  2. Use a UV light to inspect for dye leaks.
  3. Replace any leaking hoses or seals using appropriate replacement parts.

3. Recharge the AC System

Tools Required: Manifold gauge set, refrigerant canister.
If refrigerant is low, recharge the system according to specifications.
- Sub-steps:
  1. Connect the low-pressure side of the manifold gauge to the AC service port.
  2. Start the engine and turn on the AC to maximum.
  3. Open the valve on the refrigerant canister and allow refrigerant to enter the system until the pressure is within the manufacturer's recommended range.
  4. Monitor the pressure gauge while recharging.

4. Check AC Compressor Functionality

Tools Required: Multimeter.
Test the AC compressor clutch to ensure it is functioning correctly.
- Sub-steps:
  1. Disconnect the electrical connector from the compressor.
  2. Using a multimeter, check for continuity to confirm the clutch is receiving power.
  3. If there’s no power, trace the wiring back to the AC control module for faults.

5. Reassemble and Final Checks

Reconnect the battery and check for any error codes using the OBD-II scanner.
Perform a test run of the AC system to ensure the noise has stopped and cooling performance is restored.