my Toyota Corolla E170 (2013-2019) AC is blowing warm air, what could be wrong?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

529 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air in Toyota Corolla E170. 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.
•Always wear safety glasses and gloves when handling refrigerants and working on AC components.

Symptoms

•AC system blowing warm air
•AC compressor not engaging
•Unusual noises from the AC compressor area
•Increased humidity inside the vehicle
•Fogging on windshield due to lack of cooling

Diagnostic Steps

1
Check the AC system pressure using a manifold gauge set to determine if it is within the normal range.
2
Inspect the AC compressor for any signs of damage or leaks.
3
Verify that the AC compressor clutch is engaging when the AC is turned on.
4
Confirm that the cabin air filter is clean and not obstructing airflow.
5
Inspect the AC system for any refrigerant leaks using dye or electronic leak detection methods.

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

•Manifold gauge set
•Socket set
•AC refrigerant
•Leak detection dye
•Safety glasses
•Gloves

Parts Required

•AC refrigerant
•AC compressor
•Cabin air filter

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the AC system pressure using a manifold gauge set to determine if it is within the normal range.
2
Inspect the AC compressor for any signs of damage or leaks.
3
Verify that the AC compressor clutch is engaging when the AC is turned on.
4
Confirm that the cabin air filter is clean and not obstructing airflow.
5
Inspect the AC system for any refrigerant leaks using dye or electronic leak detection methods.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the battery to ensure safety while working on electrical components.

Tools Required:

Manifold gauge set
Socket set
AC refrigerant
Leak detection dye (if necessary)
Safety glasses and gloves

2. Check and Recharge AC System

Connect Manifold Gauges
- Attach the low and high-pressure sides of the manifold gauge set to the AC service ports.
Read Pressure Levels
- Observe the pressure readings. If they are low (below 30 psi on the low side), the system likely needs refrigerant.
Evacuate and Recharge
- If low, evacuate the system using a vacuum pump for at least 30 minutes to remove moisture.
- Recharge with the appropriate amount of refrigerant according to the manufacturer's specifications (usually around 1.5-2 lbs for Corolla).

3. Inspect and Replace AC Compressor

Locate and Remove AC Compressor
- Remove the belt from the AC compressor.
- Disconnect the electrical connector and refrigerant lines.
- Unbolt and remove the compressor from its mounting.
Install New Compressor
- Mount the new compressor according to torque specifications.
- Reconnect the refrigerant lines and electrical connector.
Add Oil to New Compressor
- Ensure the correct amount of PAG oil is added to the new compressor if it is not pre-filled.

4. Test the System

Reconnect Battery
- Reconnect the battery and start the vehicle.
Turn on AC
- Set the AC to maximum and check if the compressor engages and the airflow is cold.