why does my Ford Explorer Fifth Generation (2011-2019) make a hissing sound when I start the AC?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

532 words

Problem Statement

Learn how to diagnose and fix the hissing sound when starting the AC in a 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 battery before working on electrical components.
•Allow the engine to cool before inspecting the AC compressor or refrigerant lines.

Symptoms

•Hissing sound upon AC activation
•Reduced cooling performance
•Intermittent refrigerant smell (if refrigerant is leaking)
•Increased cabin humidity
•Possible fluctuating engine RPMs when AC engages

Diagnostic Steps

1
Inspect the AC compressor for any signs of leaks or damage.
2
Check the refrigerant levels using a pressure gauge.
3
Listen for the hissing sound while running the AC at different speeds.
4
Inspect the AC system's hoses and fittings for any signs of wear or cracks.
5
Use an electronic leak detector to check for refrigerant leaks in the system.
6
Verify the operation of the AC clutch engagement.

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

•Wrench set
•Flashlight
•AC manifold gauge set
•Leak detection kit (dye or electronic detector)

Parts Required

•AC compressor (if found defective)
•Hoses and fittings (if damaged)
•Refrigerant (R-134a or R-1234yf)

Related Faults

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Diagnostic Steps

1
Inspect the AC compressor for any signs of leaks or damage.
2
Check the refrigerant levels using a pressure gauge.
3
Listen for the hissing sound while running the AC at different speeds.
4
Inspect the AC system's hoses and fittings for any signs of wear or cracks.
5
Use an electronic leak detector to check for refrigerant leaks in the system.
6
Verify the operation of the AC clutch engagement.

Solution

1. Preparation

Gather tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to ensure safety while working on the AC system.

2. Inspect AC Compressor

Tools Required: Wrench set, flashlight
Inspect the compressor visually for any visible leaks or oil residue.
If leaks are found, replace the compressor.

3. Check Refrigerant Levels

Tools Required: AC manifold gauge set
Connect the manifold gauges to the high and low-pressure ports.
Read the gauges to determine if refrigerant levels are low or excessively high.
If levels are low, recharge the system with the appropriate refrigerant type (R-134a or R-1234yf as applicable).

4. Inspect Hoses and Fittings

Tools Required: Visual inspection
Carefully examine all hoses and connections for cracks, wear, or damage.
Replace any defective hoses or fittings as necessary.

5. Address Leaks

Tools Required: Leak detection kit (dye or electronic detector)
If a leak is detected, identify its source.
Use UV dye if necessary to trace the leak.
Repair or replace the leaking component.

6. Recharge AC System

Tools Required: AC manifold gauge set, refrigerant canister
Ensure the AC system is properly evacuated before refilling.
Recharge the system with the correct amount of refrigerant based on manufacturer specifications.