how to fix the AC blowing hot air in Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

555 words

Problem Statement

Learn how to diagnose and fix AC blowing hot air in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic steps 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 compressor not engaging
•Unusual noises from the AC system
•Poor airflow from the vents
•Warm air blowing from the vents despite AC being on
•AC warning light illuminated

Diagnostic Steps

1
Check the AC system for refrigerant leaks using a UV dye or electronic leak detector.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor for proper engagement and listen for unusual sounds.
4
Verify the condition and level of the refrigerant using a manifold gauge set.
5
Inspect the AC condenser for any debris or damage that could impede performance.
6
Check the climate control settings to ensure they are properly set for cooling.

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
•Vacuum pump
•Socket set
•Torque wrench

Parts Required

•Refrigerant (R-134a)
•AC compressor (if necessary)
•AC condenser (if necessary)

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Diagnostic Steps

1
Check the AC system for refrigerant leaks using a UV dye or electronic leak detector.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor for proper engagement and listen for unusual sounds.
4
Verify the condition and level of the refrigerant using a manifold gauge set.
5
Inspect the AC condenser for any debris or damage that could impede performance.
6
Check the climate control settings to ensure they are properly set for cooling.

Solution

1. Preparation

Gather tools and parts.
Disconnect the vehicle battery to ensure safety.
Allow the engine to cool down before starting work on the AC system.

2. Recharge the AC System

Tools Required: Manifold gauge set, refrigerant (R-134a), vacuum pump
Connect the manifold gauges to the low and high-pressure service ports.
Start the engine and turn the AC to maximum cooling.
Read the pressure levels. If they are low, proceed to recharge.
Use the vacuum pump to evacuate the system for at least 30 minutes to remove moisture.
Charge the system with the appropriate amount of refrigerant as specified in the owner’s manual.

3. Replace AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, AC compressor replacement part
Remove the drive belt by loosening the tensioner pulley.
Disconnect the electrical connector and refrigerant lines from the AC compressor.
Unbolt the compressor from the mounting bracket and remove it from the engine bay.
Install the new compressor by reversing the removal steps, ensuring to torque bolts to specifications.
Reconnect the refrigerant lines securely.

4. Inspect and Replace AC Condenser (if necessary)

Tools Required: Socket set, AC condenser replacement part
Remove the front grille and any components obstructing access to the condenser.
Unbolt the condenser and disconnect the refrigerant lines.
Install the new condenser by reversing the removal steps, ensuring all seals are in good condition.

5. Recheck System Functionality

Reconnect the battery.
Start the engine and turn on the AC to check for proper operation and cold air flow.