why does my Toyota Corolla E170 (2013-2019) AC blow warm air instead of cold

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

588 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air in Toyota Corolla E170 (2013-2019). 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 battery before working on electrical systems.
•Allow engine to cool before opening any components to prevent burns or injury.

Symptoms

•AC system blowing warm air
•AC compressor not engaging
•Unusual noises from the AC compressor
•Condenser fan not operating
•Refrigerant level appears low

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC-related fault codes.
2
Inspect the AC compressor for signs of damage or wear and verify if it engages when the AC is switched on.
3
Check the refrigerant level using a manifold gauge set to determine if it is low.
4
Inspect the AC condenser for blockages or damage that could impede airflow.
5
Examine all electrical connections and fuses related to the AC system for any faults.
6
Test the AC pressure switches to ensure they are functioning correctly.

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
•Socket set
•Torque wrench
•AC compressor removal tool
•Multimeter
•Safety goggles

Parts Required

•Refrigerant (R-134a)
•New AC compressor (if necessary)
•New condenser fan (if necessary)
•O-rings for refrigerant lines

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC-related fault codes.
2
Inspect the AC compressor for signs of damage or wear and verify if it engages when the AC is switched on.
3
Check the refrigerant level using a manifold gauge set to determine if it is low.
4
Inspect the AC condenser for blockages or damage that could impede airflow.
5
Examine all electrical connections and fuses related to the AC system for any faults.
6
Test the AC pressure switches to ensure they are functioning correctly.

Solution

1. Preparation

Gather tools and parts required for repair.
Disconnect the vehicle battery to ensure safety when working on the electrical system.

2. Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant (R-134a), safety goggles
Sub-steps:
1. Connect the low-pressure side of the manifold gauge to the service port on the AC system.
2. Open the valve on the refrigerant canister and allow refrigerant to flow into the system, monitoring the pressure gauge.
3. Ensure the pressure reaches manufacturer specifications (typically between 25-45 PSI).
4. Disconnect the manifold gauge and securely replace the service port cap.

3. Replace AC Compressor (if faulty)

Tools Required: Socket set, torque wrench, AC compressor removal tool, new AC compressor, O-rings
Sub-steps:
1. Remove the serpentine belt by loosening the tensioner pulley.
2. Disconnect electrical connectors from the AC compressor.
3. Remove the refrigerant lines from the compressor, capturing any residual refrigerant safely.
4. Unscrew and remove the AC compressor from its mounting brackets.
5. Install the new compressor by reversing the removal steps, ensuring to replace O-rings and tightening to manufacturer specifications (typically around 15-20 ft-lbs).

4. Inspect and Replace Condenser Fan (if inoperative)

Tools Required: Socket set, multimeter
Sub-steps:
1. Test the condenser fan by applying direct power to it to see if it operates.
2. If it does not operate, remove the fan assembly by unscrewing the mounting bolts.
3. Replace with a new condenser fan and reconnect the wiring harness.