how to fix Honda Accord 9th Generation (2013-2017) AC that is blowing hot air

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 AC blowing hot air issue in Honda Accord 9th Generation (2013-2017). Step-by-step guide with tools and parts required.

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 AC system to avoid injury.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•AC system makes unusual noises (e.g., hissing or clicking)
•Poor airflow from vents
•AC warning light illuminated on dashboard

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any faults related to the AC system.
2
Check the refrigerant levels using a manifold gauge set to ensure proper refrigerant charge.
3
Inspect the AC compressor for any signs of damage or wear.
4
Examine the electrical connections to the AC compressor and ensure the clutch is engaging.
5
Test the AC relay and fuse to verify they are functioning correctly.
6
Look for leaks in the AC system, including hoses, fittings, and the condenser.

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
•Socket set
•Wrench
•Fuse puller or pliers
•Pulley puller

Parts Required

•R-134a refrigerant
•New AC compressor
•AC relay (if faulty)
•AC fuse (if blown)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any faults related to the AC system.
2
Check the refrigerant levels using a manifold gauge set to ensure proper refrigerant charge.
3
Inspect the AC compressor for any signs of damage or wear.
4
Examine the electrical connections to the AC compressor and ensure the clutch is engaging.
5
Test the AC relay and fuse to verify they are functioning correctly.
6
Look for leaks in the AC system, including hoses, fittings, and the condenser.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working on electrical components.
Allow the engine to cool before beginning work on the AC system.

2. Check and Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant.
Connect the low-pressure side of the manifold gauge to the AC service port.
Check the readings; if low, proceed to recharge the system with R-134a refrigerant according to the manufacturer's specifications.
Monitor the pressure while charging to ensure it reaches the appropriate level (typically 30-40 PSI on low side).

3. Inspect and Replace AC Compressor

Tools Required: Socket set, wrench, pulley puller, new AC compressor.
Remove the serpentine belt by releasing tension on the tensioner pulley.
Disconnect electrical connectors and refrigerant lines from the AC compressor.
Remove mounting bolts and carefully extract the compressor from the engine bay.
Install the new compressor by reversing the removal steps, ensuring all connections are tight and secure.

4. Replace AC Relay and Fuse (if necessary)

Tools Required: Fuse puller or pliers.
Locate the fuse box and identify the AC relay and fuse (refer to the owner’s manual for location).
Remove the old relay and fuse and replace them with new ones of the same rating.

5. Test System Functionality

Reconnect the battery and start the engine.
Turn on the AC and check if the compressor engages and cold air starts blowing.
Monitor the system for any unusual sounds.