how to fix my Toyota Corolla E170 (2013-2019) AC that is blowing warm air

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

574 words

Problem Statement

Learn how to diagnose and fix the AC blowing warm air issue in Toyota Corolla E170 (2013-2019). Step-by-step guide with tools and repair instructions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always wear safety goggles and gloves when working on the AC system.
•Ensure the engine is off and cool before performing any inspections or repairs.
•Handle refrigerants carefully and follow disposal regulations.

Symptoms

•AC system blowing warm air
•Unusual noises when AC is turned on (e.g., hissing or clicking)
•AC compressor not engaging
•Poor airflow from vents
•Unpleasant odors from AC vents

Diagnostic Steps

1
Inspect the AC system for visible leaks or damage to components.
2
Check refrigerant levels using a manifold gauge set.
3
Verify the AC compressor operation by listening for engagement sounds while the AC is turned on.
4
Scan for error codes related to the AC system using an OBD-II scanner.
5
Test the blower motor operation and airflow from the vents.

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 goggles
•Gloves
•Manifold gauge set
•OBD-II scanner
•Basic hand tools (socket set, wrenches)

Parts Required

•Refrigerant
•AC compressor (if faulty)
•AC receiver/drier (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect the AC system for visible leaks or damage to components.
2
Check refrigerant levels using a manifold gauge set.
3
Verify the AC compressor operation by listening for engagement sounds while the AC is turned on.
4
Scan for error codes related to the AC system using an OBD-II scanner.
5
Test the blower motor operation and airflow from the vents.

Solution

1. Preparation

Tools Required: Safety goggles, gloves, manifold gauge set, OBD-II scanner, basic hand tools (socket set, wrenches).
Ensure the vehicle is parked on a level surface and the engine is turned off.

2. Check and Recharge Refrigerant

Connect Manifold Gauges:
- Attach the low-pressure side (blue) and high-pressure side (red) gauges to the corresponding service ports on the AC system.
Read Pressure Levels:
- Start the engine and turn on the AC to the maximum setting. Record the pressure readings.
Recharge if Necessary:
- If low refrigerant levels are detected, connect a refrigerant canister to the low-pressure side and follow the manufacturer's instructions to recharge the system until proper levels are achieved (typically 30-40 psi on low side).

3. Inspect and Replace AC Components

Inspect AC Compressor:
- Check the compressor for signs of wear or damage. If it does not engage, replace the compressor.
- Disconnect the electrical connector and remove the mounting bolts. Install the new compressor and reconnect the electrical connector.
Replace AC Receiver/Drier:
- Drain the refrigerant from the system (if necessary) and remove the receiver/drier.
- Install the new receiver/drier and ensure all seals and connections are tight.

4. Test AC Functionality

Reconnect and Recharge:
- After replacing any components, reconnect the system and recharge it with refrigerant if necessary.
Run AC System:
- Start the engine and run the AC to check for cold air and ensure all components are functioning properly.