why does my Honda Accord 9th Generation (2013-2017) AC compressor run continuously

Honda Accord Eleventh Generation (2023-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

550 words

Problem Statement

Learn how to diagnose and fix the issue of AC compressor running continuously in Honda Accord 9th Generation. Step-by-step guide with diagnostic procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine and AC components to cool before inspection to prevent burns.

Symptoms

•AC compressor does not cycle off
•Inconsistent cabin temperature (either too cold or not cooling enough)
•Increased engine load leading to reduced fuel efficiency
•Noticeable noise from the compressor operation
•Possible refrigerant leaks or hissing sound
•"Check AC" warning light illuminated (if applicable)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any climate control system faults.
2
Inspect the AC control module for any signs of malfunction or damage.
3
Check the refrigerant level to ensure it is at the correct pressure.
4
Test the AC pressure switches to confirm they are functioning properly.
5
Inspect the compressor relay and fuse for any signs of failure.
6
Examine the climate control settings to ensure they are set properly.

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 refrigerant (R-134a)
•Pressure switches (if faulty)
•AC compressor relay (if faulty)
•Climate control module (if needed)

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Symptoms

•AC compressor does not cycle off

•Inconsistent cabin temperature (either too cold or not cooling enough)

•Increased engine load leading to reduced fuel efficiency

•Noticeable noise from the compressor operation

•Possible refrigerant leaks or hissing sound

•"Check AC" warning light illuminated (if applicable)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any climate control system faults.
2
Inspect the AC control module for any signs of malfunction or damage.
3
Check the refrigerant level to ensure it is at the correct pressure.
4
Test the AC pressure switches to confirm they are functioning properly.
5
Inspect the compressor relay and fuse for any signs of failure.
6
Examine the climate control settings to ensure they are set properly.

Solution

1. Preparation

Gather tools and materials.
Ensure the engine is off and the vehicle is parked on a level surface.
Disconnect the battery to prevent electrical shorts.

2. Check Refrigerant Levels

Use a refrigerant gauge to check the low and high side pressure.
If low, recharge the system with the recommended refrigerant type (R-134a for this model).
If overfilled, evacuate some refrigerant.

3. Inspect and Test Pressure Switches

Locate the low and high pressure switches on the AC lines.
Disconnect the electrical connectors and use a multimeter to test for continuity.
Replace switches that do not show continuity when the AC is operating.

4. Examine AC Control Module

Remove the dashboard panel to access the climate control unit.
Check for any loose connections or damaged components.
If necessary, replace the entire climate control module.

5. Test Compressor Relay

Find the AC compressor relay in the fuse box.
Remove the relay and test it with a multimeter for continuity.
Replace the relay if it does not function correctly.

6. Reconnect Battery and Test

Reconnect the battery.
Start the vehicle and test the AC system to ensure proper cycling of the compressor.