what causes the AC compressor not to engage in a Ford Explorer Fifth Generation (2011-2019)?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

510 words

Problem Statement

Learn how to diagnose and fix AC compressor engagement issues 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 systems.
•Allow the engine to cool before servicing the AC system to avoid burns.

Symptoms

•AC not blowing cold air
•AC compressor clutch not engaging
•Unusual noise when attempting to turn on AC
•Dashboard AC control lights not illuminating
•Decreased engine performance when AC is engaged

Diagnostic Steps

1
Check the AC system's refrigerant level using a pressure gauge.
2
Scan the vehicle's OBD-II system for any error codes related to the AC system.
3
Inspect the AC compressor clutch visually for signs of damage or wear.
4
Test the AC relay and fuse for continuity with a multimeter.
5
Verify voltage at the compressor connector when the AC is turned on.
6
Inspect the AC pressure switch for proper operation.

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
•Socket set
•Refrigerant canister

Parts Required

•AC relay
•AC fuse
•AC pressure switch
•Refrigerant

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Diagnostic Steps

1
Check the AC system's refrigerant level using a pressure gauge.
2
Scan the vehicle's OBD-II system for any error codes related to the AC system.
3
Inspect the AC compressor clutch visually for signs of damage or wear.
4
Test the AC relay and fuse for continuity with a multimeter.
5
Verify voltage at the compressor connector when the AC is turned on.
6
Inspect the AC pressure switch for proper operation.

Solution

1. Preparation

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

2. Recharge Refrigerant

Tools Required: Refrigerant canister, manifold gauge set.
Sub-steps:
1. Attach the manifold gauges to the high and low-pressure ports of the AC system.
2. Check the pressure readings; if low, proceed to recharge the system.
3. Add refrigerant according to the manufacturer's specifications (usually around 2-3 lbs for this model).
4. Monitor pressure until it reaches the recommended levels.

3. Replace AC Relay and Fuse

Tools Required: Socket set, multimeter.
Sub-steps:
1. Locate the fuse box and identify the AC relay and fuse.
2. Remove the faulty relay and replace it with a new one.
3. Replace any blown fuses by checking for continuity.
4. Test the AC system after replacement.

4. Inspect and Replace AC Pressure Switch

Tools Required: Socket set, screwdrivers.
Sub-steps:
1. Locate the AC pressure switch on the accumulator or discharge line.
2. Disconnect the electrical connector from the pressure switch.
3. Remove the switch from the line and install a new one.
4. Reconnect the electrical connector and test the AC system.

5. Test AC Compressor Voltage

Tools Required: Multimeter.
Sub-steps:
1. Reconnect the battery and turn on the AC.
2. Measure the voltage at the compressor connector.
3. If voltage is present but the compressor doesn’t engage, consider replacing the compressor.