why does my Honda Civic 9th Generation (2012-2015) AC blow warm air

Honda Civic 9th Generation (2012-2015)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

599 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air in Honda Civic 9th Generation (2012-2015). 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 any components related to the AC system.

Symptoms

•AC compressor not engaging
•Warm air from vents despite setting cooler temperature
•Unusual noises from the AC compressor
•Moisture or refrigerant leaks under the vehicle
•Reduced airflow from the AC vents
•AC system cycling on and off frequently

Diagnostic Steps

1
Check the AC system fuse for continuity using a multimeter.
2
Scan the vehicle for any error codes related to the AC system using an OBD-II scanner.
3
Inspect the AC compressor for physical damage and listen for any unusual sounds during operation.
4
Verify the refrigerant level using a manifold gauge set.
5
Check for any visible leaks in the AC system components, including hoses and connections.
6
Test the AC pressure switch to ensure it is functioning 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
•Multimeter
•Manifold gauge set
•Socket set
•Flashlight

Parts Required

•AC fuse (if blown)
•Refrigerant (R-134a)
•AC compressor (if faulty)
•Receiver/dryer (if compressor is replaced)

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Diagnostic Steps

1
Check the AC system fuse for continuity using a multimeter.
2
Scan the vehicle for any error codes related to the AC system using an OBD-II scanner.
3
Inspect the AC compressor for physical damage and listen for any unusual sounds during operation.
4
Verify the refrigerant level using a manifold gauge set.
5
Check for any visible leaks in the AC system components, including hoses and connections.
6
Test the AC pressure switch to ensure it is functioning properly.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, manifold gauge set, socket set, flashlight.
Disconnect the negative battery terminal to prevent electrical shorts.
Allow the engine to cool before starting any work on the AC system.

2. Replace AC Fuse

Locate the fuse box and identify the AC fuse (refer to the owner's manual).
Remove the AC fuse and inspect it for continuity.
If blown, replace it with a fuse of the same amperage.

3. Recharge Refrigerant

Connect the manifold gauge set to the low and high-pressure service ports of the AC system.
Check the refrigerant levels; if low, follow these sub-steps:
- Attach the refrigerant can to the low-pressure port.
- Open the can and let refrigerant flow into the system while monitoring the pressure gauge.
- Ensure the pressure is within the manufacturer's specifications (typically 25-45 psi on the low side).
Disconnect the manifold gauge set once the refrigerant is added.

4. Inspect and Replace AC Compressor (if necessary)

If the compressor is damaged:
- Disconnect the electrical connector and high-pressure lines from the compressor.
- Remove the mounting bolts securing the compressor to the engine block.
- Install the new compressor by reversing the removal steps and ensuring all connections are secure.
- Replace the receiver/dryer as well if compressor failure is suspected.

5. Test the System

Reconnect the negative battery terminal.
Start the engine and turn on the AC system to the maximum cool setting.
Allow the system to run for a few minutes and check for proper cooling and airflow.