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

3 min read

515 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
•Allow the AC system to depressurize before servicing to avoid refrigerant exposure

Symptoms

•Warm air blowing from the vents
•AC compressor not engaging
•Unusual noises from the AC system
•Condensation on the inside of the car windows
•Decreased airflow from the vents
•AC light blinking or not illuminating

Diagnostic Steps

1
Check AC controls to ensure the AC is turned on and set to the coldest setting
2
Scan for error codes using OBD-II scanner
3
Inspect refrigerant levels using a pressure gauge
4
Examine AC compressor visually for signs of damage or leaks
5
Test AC relay and fuses for continuity
6
Check for blocked condenser by inspecting for dirt or debris

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 glasses
•Gloves
•OBD-II scanner
•Multimeter
•Refrigerant pressure gauge

Parts Required

•Refrigerant (R-134a)
•AC compressor (if needed)
•Receiver drier or accumulator (if needed)
•Cabin air filter (if needed)

Related Faults

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Diagnostic Steps

1
Check AC controls to ensure the AC is turned on and set to the coldest setting
2
Scan for error codes using OBD-II scanner
3
Inspect refrigerant levels using a pressure gauge
4
Examine AC compressor visually for signs of damage or leaks
5
Test AC relay and fuses for continuity
6
Check for blocked condenser by inspecting for dirt or debris

Solution

1. Preparation

Tools Required: Safety glasses, gloves, OBD-II scanner, multimeter, refrigerant pressure gauge.
Safety Warnings: Disconnect the battery before working on electrical systems.

2. Recharge the AC System

Sub-steps:
1. Connect the refrigerant pressure gauge to the low-pressure service port of the AC system.
2. Check the pressure readings; if low, proceed to recharge.
3. Follow the manufacturer’s instructions to add the correct type and amount of refrigerant (usually R-134a for this model).
4. Monitor the pressure gauge while recharging to avoid overfilling.

3. Replace Faulty Components

Sub-steps:
1. If the compressor is not engaging, check the AC relay and replace if necessary.
2. If the compressor is leaking, remove the old compressor by disconnecting electrical connectors and refrigerant lines.
3. Install a new compressor, ensuring proper torque settings for the bolts (typically around 20-30 Nm).
4. Replace the receiver drier or accumulator if recommended during compressor replacement.

4. Inspect and Clean Components

Sub-steps:
1. Clean the condenser using a soft brush or compressed air to remove dirt and debris.
2. Inspect the cabin air filter and replace if clogged to ensure proper airflow.