why does my Toyota Corolla E170 (2013-2019) AC blow warm air?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

636 words

Problem Statement

Complete guide to fixing AC that blows warm air in Toyota Corolla E170 (2013-2019). Includes symptoms, diagnostic steps, tools required, and repair procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure all refrigerant is properly evacuated before servicing AC components.

Symptoms

•AC system does not cool the air as expected
•Increased cabin temperature, especially in hot weather
•Unusual noises from the AC compressor
•AC compressor not engaging or cycling on and off frequently
•Presence of refrigerant leaks around AC components

Diagnostic Steps

1
Check the AC settings to ensure it is set to the maximum cooling and the recirculation mode is activated.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor belt for wear or damage.
4
Verify the refrigerant level using a manifold gauge set.
5
Check for electrical issues by testing the AC relay and fuses.
6
Look for signs of leaks or damage in the AC hoses and connections.

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
•Multimeter
•AC compressor removal tool

Parts Required

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

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Diagnostic Steps

1
Check the AC settings to ensure it is set to the maximum cooling and the recirculation mode is activated.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor belt for wear or damage.
4
Verify the refrigerant level using a manifold gauge set.
5
Check for electrical issues by testing the AC relay and fuses.
6
Look for signs of leaks or damage in the AC hoses and connections.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal to ensure safety.
Allow the engine to cool down before starting work.

2. Check and Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant canister.
Sub-steps:
1. Connect the low-pressure side of the manifold gauge to the AC service port.
2. Start the vehicle and turn on the AC to the maximum setting.
3. Check the pressure readings; if low, proceed to recharge the system.
4. Attach the refrigerant canister to the manifold gauge and add refrigerant as needed, following the manufacturer's specifications (typically R-134a).
5. Monitor the pressure until it reaches the recommended level (approximately 30-40 psi on the low side).

3. Inspect and Replace AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, AC compressor removal tool.
Sub-steps:
1. Remove the serpentine belt by loosening the tensioner pulley.
2. Disconnect the electrical connector from the AC compressor.
3. Remove the refrigerant lines from the compressor (ensure all refrigerant is evacuated before this step).
4. Unbolt the AC compressor from the engine block.
5. Install the new compressor by reversing these steps, ensuring all connections are tight and secure.

4. Check and Replace AC Relay (if necessary)

Tools Required: Multimeter.
Sub-steps:
1. Locate the AC relay in the fuse box (refer to the owner's manual for specifics).
2. Use a multimeter to test the relay for continuity.
3. If faulty, remove the old relay and replace it with a new one.

5. Final Assembly and Testing

Tools Required: Torque wrench.
Sub-steps:
1. Reinstall the serpentine belt and ensure proper tension.
2. Reconnect the negative battery terminal.
3. Start the vehicle and test the AC system for proper cooling.