Honda Pilot Third Generation (2016-present) AC compressor not kicking on how to fix

Honda Pilot Third Generation (2016-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

500 words

Problem Statement

Learn how to diagnose and fix the AC compressor not engaging in Honda Pilot (2016-present). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Wear safety glasses and gloves when handling refrigerants and electrical components.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•AC system making unusual noises (if any)
•Dashboard AC control lights not functioning
•Potential check engine light illuminated

Diagnostic Steps

1
Scan the vehicle's computer for error codes using an OBD-II scanner.
2
Check the refrigerant level to ensure it is within specifications.
3
Inspect the AC control module and associated fuses for continuity.
4
Test the AC compressor relay for proper operation.
5
Examine the AC pressure switch and associated wiring for faults.
6
Check the AC clutch for engagement when the AC is turned on.

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
•Refrigerant gauge
•Multimeter
•Socket set
•Screwdrivers

Parts Required

•AC compressor relay
•AC pressure switch (if found faulty)
•AC refrigerant (if low)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's computer for error codes using an OBD-II scanner.
2
Check the refrigerant level to ensure it is within specifications.
3
Inspect the AC control module and associated fuses for continuity.
4
Test the AC compressor relay for proper operation.
5
Examine the AC pressure switch and associated wiring for faults.
6
Check the AC clutch for engagement when the AC is turned on.

Solution

1. Preparation

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

2. Check Refrigerant Level

Locate the AC service ports (low and high).
Use a refrigerant gauge to check the levels.
If low, recover any remaining refrigerant using a recovery machine before recharging.

3. Inspect and Replace Fuses

Locate the fuse box; consult the owner's manual for the exact location of the AC-related fuses.
Visually inspect the fuses; replace any that are blown with the same amperage rating.

4. Test and Replace AC Compressor Relay

Locate the AC compressor relay in the fuse box or relay panel.
Use a multimeter to test the relay for continuity.
If faulty, replace the relay with a new one of the same specifications.

5. Examine and Replace Pressure Switch

Locate the AC pressure switch on the accumulator or near the compressor.
Disconnect the electrical connector and measure the voltage at the connector with the engine running.
If no voltage is present, the pressure switch may need replacement.

6. Reconnect Battery and Test

Reconnect the negative battery terminal.
Start the engine and turn on the AC to check if the compressor engages.