why does my Honda Accord's AC blow warm air when it’s on

Honda Accord 9th Generation (2013-2017)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

538 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air in Honda Accord. 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

•Always disconnect the battery before working on electrical systems.
•Use appropriate safety gear when handling refrigerants.

Symptoms

•AC blows warm air instead of cold
•AC compressor does not engage
•Unusual noises from the AC system
•Foul odors coming from vents
•AC blows air at a reduced flow rate

Diagnostic Steps

1
Check the AC system for any visible leaks or signs of damage.
2
Use an OBD-II scanner to check for any error codes related to the HVAC system.
3
Measure the refrigerant pressure using a manifold gauge set.
4
Inspect the AC compressor for proper operation and engagement.
5
Verify the function of the AC control switch and related electrical components.
6
Check the cabin air filter for blockage or excessive dirt.

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

Parts Required

•Refrigerant (R-134a or R-1234yf)
•Cabin air filter (if needed)

Related Faults

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Diagnostic Steps

1
Check the AC system for any visible leaks or signs of damage.
2
Use an OBD-II scanner to check for any error codes related to the HVAC system.
3
Measure the refrigerant pressure using a manifold gauge set.
4
Inspect the AC compressor for proper operation and engagement.
5
Verify the function of the AC control switch and related electrical components.
6
Check the cabin air filter for blockage or excessive dirt.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal for safety.
Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect Refrigerant Level

Tools Required: Manifold gauge set
Attach the manifold gauge set to the AC service ports (high and low).
Check the pressure readings against manufacturer specifications to determine if refrigerant is low.
If low, proceed to recharge the system.

3. Recharge AC System

Parts Required: Refrigerant (R-134a or R-1234yf, depending on the model year)
Connect the refrigerant can to the low-pressure service port.
Open the valve on the refrigerant can and allow it to flow into the system while monitoring the pressure on the gauges.
Close the valve once the correct pressure is achieved.

4. Check AC Compressor Operation

Tools Required: Multimeter
With the engine running, check for voltage at the AC compressor connector.
If there is no voltage, trace back the electrical connections to identify any faulty wiring or blown fuses.
If voltage is present but the compressor does not engage, the compressor may need to be replaced.

5. Replace Cabin Air Filter (if necessary)

Parts Required: New cabin air filter
Locate the cabin air filter compartment (usually behind the glove box).
Remove the old filter and install the new one, ensuring it is oriented correctly.