my Toyota Corolla E170 (2013-2019) AC is blowing warm air, what could be wrong?

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air in Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before inspecting the AC system to avoid burns.

Symptoms

•AC system blowing warm air instead of cold
•Increased cabin humidity
•Unusual noises from the AC compressor
•AC compressor not engaging
•Fogging of the windshield in humid conditions

Diagnostic Steps

1
Check the AC settings to ensure the system is set to 'Max A/C' or 'A/C On.'
2
Scan for error codes using an OBD-II scanner to identify any related issues.
3
Inspect the AC compressor for visible signs of damage or leaks.
4
Verify refrigerant levels with a manifold gauge set.
5
Check the AC relay and fuse for proper operation.
6
Inspect the cabin air filter for blockage or dirt buildup.

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
•Multimeter
•Socket set

Parts Required

•Refrigerant (R134a)
•AC relay (if faulty)
•Cabin air filter (if needed)

Related Faults

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Diagnostic Steps

1
Check the AC settings to ensure the system is set to 'Max A/C' or 'A/C On.'
2
Scan for error codes using an OBD-II scanner to identify any related issues.
3
Inspect the AC compressor for visible signs of damage or leaks.
4
Verify refrigerant levels with a manifold gauge set.
5
Check the AC relay and fuse for proper operation.
6
Inspect the cabin air filter for blockage or dirt buildup.

Solution

1. Preparation

Gather tools: OBD-II scanner, manifold gauge set, multimeter, socket set, and a replacement cabin air filter (if needed).
Ensure the vehicle is parked on a flat surface and the engine is off.

2. Check Refrigerant Levels

Connect the manifold gauge set to the low and high-pressure service ports of the AC system.
Start the engine and turn on the AC to maximum settings.
Read the pressure values on the gauges. Low pressure indicates a refrigerant leak, while excessive pressure may suggest a clog.

3. Recharge or Repair Refrigerant Leak

If the refrigerant is low, locate and repair any leaks (e.g., using UV dye and a leak detector).
Use the appropriate refrigerant type (typically R134a for this model) and recharge the system according to manufacturer specifications.
Ensure to follow local regulations for refrigerant handling.

4. Inspect and Replace AC Components

If the compressor is not engaging, test the AC relay with a multimeter for continuity. Replace if faulty.
If any components such as the expansion valve or receiver-drier are damaged or clogged, replace them as necessary.

5. Replace Cabin Air Filter (if needed)

Remove the glove compartment for access to the cabin air filter housing.
Take out the old filter and install a new one, ensuring it is oriented correctly.

6. Final Checks

Reconnect any components removed during inspection.
Start the vehicle and run the AC to confirm cold air is blowing.