how can I fix the rear air conditioning not working in my Ford Explorer?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix rear air conditioning issues in Ford Explorer. 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 engine to cool before opening the hood.

Symptoms

•Rear air conditioning vents blowing warm air
•Rear air conditioning not turning on
•Unusual noises from the rear AC unit
•Poor airflow from rear vents
•Front air conditioning functioning normally

Diagnostic Steps

1
Inspect the rear AC controls to ensure they are set correctly and functioning.
2
Check for any blown fuses related to the rear AC system.
3
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may indicate issues with the HVAC system.
4
Inspect the rear AC blower motor for proper operation.
5
Check refrigerant levels in the rear AC system using a manifold gauge set.
6
Examine the rear AC evaporator for any blockages or leaks.

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
•Multimeter
•Socket set
•Manifold gauge set
•Fuse puller

Parts Required

•Rear AC blower motor (if defective)
•Refrigerant (R-134a)
•Fuses (as needed)

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Diagnostic Steps

1
Inspect the rear AC controls to ensure they are set correctly and functioning.
2
Check for any blown fuses related to the rear AC system.
3
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may indicate issues with the HVAC system.
4
Inspect the rear AC blower motor for proper operation.
5
Check refrigerant levels in the rear AC system using a manifold gauge set.
6
Examine the rear AC evaporator for any blockages or leaks.

Solution

1. Preparation

Gather tools and parts necessary for the repair.
Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Fuses

Locate the fuse box (usually under the dashboard or in the engine compartment).
Identify the fuse for the rear AC system using the diagram on the fuse box cover.
Remove the blown fuse with a fuse puller or pliers.
Replace with a new fuse of the same amperage.

3. Inspect and Replace Blower Motor

Remove the rear AC unit cover using a socket set.
Disconnect the electrical connector from the blower motor.
Remove the blower motor by unscrewing it from its housing.
Install the new blower motor in reverse order, ensuring it is securely fastened.
Reconnect the electrical connector.

4. Recharge the Refrigerant

Connect manifold gauges to the low and high-side service ports.
Start the engine and turn the AC to the maximum setting.
Check the refrigerant levels and add refrigerant as necessary, ensuring it is the correct type (usually R-134a).
Remove the gauges and replace the service port caps.

5. Inspect and Clean Evaporator

If blockages are suspected, remove the rear AC unit cover once again.
Inspect the evaporator for debris and clean gently with a soft brush.
Ensure there are no leaks evident on the evaporator or surrounding pipes.