my Ford Explorer Fifth Generation (2011-2019) is making a hissing sound 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

464 words

Problem Statement

Learn how to diagnose and fix the hissing sound when AC is activated 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 the battery before working on electrical components.
•Ensure proper refrigerant recovery to avoid environmental hazards.

Symptoms

•Hissing sound when AC is turned on
•Decreased cooling performance from the AC
•Possible intermittent loss of refrigerant
•Moisture or puddling around AC components
•AC compressor cycling on and off frequently

Diagnostic Steps

1
Inspect the AC system for visible leaks around hoses and connections.
2
Use an AC manifold gauge set to check the refrigerant pressure levels.
3
Listen for the hissing sound while monitoring the AC system operation.
4
Check the AC compressor for proper function and any signs of damage.
5
Inspect the expansion valve or orifice tube for blockages or malfunctions.
6
Examine the cabin air filter for clogs that may affect airflow.

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

•Socket set
•AC manifold gauge set
•UV dye and UV light
•AC recovery machine
•Torque wrench
•Refrigerant

Parts Required

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

Related Faults

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Diagnostic Steps

1
Inspect the AC system for visible leaks around hoses and connections.
2
Use an AC manifold gauge set to check the refrigerant pressure levels.
3
Listen for the hissing sound while monitoring the AC system operation.
4
Check the AC compressor for proper function and any signs of damage.
5
Inspect the expansion valve or orifice tube for blockages or malfunctions.
6
Examine the cabin air filter for clogs that may affect airflow.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal to avoid electrical shocks.
Ensure the vehicle is parked on a level surface with the engine off.

2. Locate the Leak

Sub-steps:
1. Using a UV dye, introduce it into the AC system if a leak is suspected.
2. Allow the system to run for a short period (10-15 minutes).
3. Use a UV light to inspect for dye leaks in the AC components.

3. Replace Faulty Components

Sub-steps:
1. If a leak is detected in the hoses or connections, replace them with OEM parts.
2. If the compressor is faulty, remove it by:
  - Disconnecting the electrical connector.
  - Removing the mounting bolts using a socket set.
  - Detaching the refrigerant lines (ensure proper recovery of refrigerant).
3. Install the new compressor by reversing the removal steps and ensuring all bolts are torqued to manufacturer specifications.

4. Recharge the AC System

Sub-steps:
1. Reconnect the refrigerant lines and ensure all connections are tight.
2. Use an AC machine to evacuate the system to remove moisture and air.
3. Recharge the system with the correct amount of refrigerant as specified in the service manual.

5. Test the AC System

Sub-steps:
1. Reconnect the negative battery terminal.
2. Start the engine and turn on the AC to check for the hissing sound.
3. Monitor the AC performance to ensure it is cooling effectively.

Tools Required:

Socket set
AC manifold gauge set
UV dye and UV light
AC recovery machine
Torque wrench
Refrigerant (as specified)

Parts Required:

AC compressor (if faulty)
Refrigerant hoses (if leaking)
Expansion valve or orifice tube (if blocked)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on electrical components.
Ensure proper refrigerant recovery to avoid environmental hazards.