how to fix my Toyota Corolla E170 (2013-2019) air conditioning not blowing cold air

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

594 words

Problem Statement

Learn how to diagnose and fix the A/C not blowing cold air in Toyota Corolla E170 (2013-2019). 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

•Always disconnect the battery before working on electrical systems.
•Handle refrigerants according to safety guidelines and local regulations.

Symptoms

•A/C system blows warm air instead of cold
•A/C compressor is not engaging
•Unusual noises from the A/C compressor
•A/C system operates intermittently
•Dashboard A/C controls are unresponsive or malfunctioning

Diagnostic Steps

1
Check the A/C system for any visible leaks around hoses and fittings.
2
Use an OBD-II scanner to check for any related error codes.
3
Inspect the A/C compressor for proper engagement and listen for any unusual sounds.
4
Measure the refrigerant pressure with a manifold gauge set to ensure it is within specifications.
5
Verify the condition of the A/C condenser and evaporator for blockages or damage.
6
Test the A/C control module and associated electrical connections for faults.

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

•Safety glasses
•Gloves
•OBD-II scanner
•Manifold gauge set
•Refrigerant recovery machine

Parts Required

•Refrigerant (R-134a)
•A/C compressor (if faulty)
•A/C condenser or evaporator (if damaged)
•Hoses and fittings (if leaks are present)

Related Faults

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Diagnostic Steps

1
Check the A/C system for any visible leaks around hoses and fittings.
2
Use an OBD-II scanner to check for any related error codes.
3
Inspect the A/C compressor for proper engagement and listen for any unusual sounds.
4
Measure the refrigerant pressure with a manifold gauge set to ensure it is within specifications.
5
Verify the condition of the A/C condenser and evaporator for blockages or damage.
6
Test the A/C control module and associated electrical connections for faults.

Solution

1. Preparation

Tools Required: Safety glasses, gloves, OBD-II scanner, manifold gauge set, refrigerant recovery machine (if needed).
Sub-steps:
- Ensure the vehicle is parked on a level surface.
- Disconnect the battery to prevent any electrical shorts.
- Wear safety glasses and gloves for protection.

2. Recover Refrigerant (if necessary)

Tools Required: Refrigerant recovery machine.
Sub-steps:
- Connect the recovery machine to the A/C service ports.
- Follow the machine's instructions to safely recover the refrigerant.
- Dispose of recovered refrigerant according to local regulations.

3. Inspect and Repair Components

Sub-steps:
- Check the A/C compressor: If it is not engaging, test the electrical connections and replace it if faulty.
- Inspect the A/C condenser and evaporator for blockages or damage, clean or replace as necessary.
- If refrigerant level is low, refill with the correct type and amount of refrigerant (R-134a).
- Replace any damaged hoses or fittings found during inspection.

4. Recharge A/C System

Tools Required: Manifold gauge set, refrigerant canister.
Sub-steps:
- Connect the manifold gauge set to the A/C service ports.
- Open the low-pressure side valve and add refrigerant until the correct pressure is achieved.
- Monitor the high-pressure side to ensure it remains within specifications.
- Close the valves and disconnect the manifold gauges.

5. Final Checks

Sub-steps:
- Reconnect the battery.
- Start the vehicle and engage the A/C system to check for proper operation.
- Monitor the air temperature coming from the vents to ensure it is cold.