how to fix Honda CR-V Fifth Generation (2017-2022) if the AC blows warm air

Honda CR-V Fifth Generation (2017-2022)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

554 words

Problem Statement

Learn how to diagnose and fix the AC blowing warm air issue in Honda CR-V (2017-2022). 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

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

Symptoms

•AC system blowing warm air
•AC compressor not engaging
•Unusual noises from the AC system
•Increased humidity inside the vehicle
•AC control panel lights not functioning properly

Diagnostic Steps

1
Inspect the AC control settings to ensure the system is set to the correct mode and temperature.
2
Check for visible damage or leaks in the AC hoses and components.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Measure the refrigerant levels using a manifold gauge set to ensure they are within manufacturer specifications.
5
Verify the operation of the AC compressor by checking for engagement while the AC is turned on.
6
Inspect the AC relay and fuses for continuity.

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
•Torque wrench
•Safety glasses
•Gloves

Parts Required

•Refrigerant (R-1234yf)
•AC compressor (if replacement is needed)
•AC relay and fuses (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect the AC control settings to ensure the system is set to the correct mode and temperature.
2
Check for visible damage or leaks in the AC hoses and components.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Measure the refrigerant levels using a manifold gauge set to ensure they are within manufacturer specifications.
5
Verify the operation of the AC compressor by checking for engagement while the AC is turned on.
6
Inspect the AC relay and fuses for continuity.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to ensure safety.
Allow the system to cool down if it has been running.

2. Recharge the AC System

Tools Required: Manifold gauge set, refrigerant (R-1234yf), safety glasses, gloves.
Locate the low-pressure service port on the AC system.
Attach the low-pressure hose from the manifold gauge set to the service port.
Open the valve on the refrigerant canister and slowly add refrigerant until the pressure gauge indicates it is within the specified range (typically 30-40 psi on the low side).
Monitor the system while adding refrigerant to avoid overcharging.

3. Inspect and Replace the AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, AC compressor replacement kit, refrigerant oil.
Remove the serpentine belt by loosening the tensioner pulley.
Disconnect electrical connectors and refrigerant lines from the AC compressor.
Remove the mounting bolts and carefully take out the old compressor.
Install the new compressor, ensuring to add the manufacturer-specified amount of refrigerant oil.
Reconnect the refrigerant lines and electrical connectors, then replace the serpentine belt.

4. Check the AC Relay and Fuses

Tools Required: Multimeter.
Locate the AC relay and fuses in the fuse box.
Use a multimeter to test the relay for continuity; replace if faulty.
Check the fuses for any signs of damage and replace as necessary.