my Toyota Corolla E170 (2013-2019) AC blows hot air what is the problem

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

603 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 procedures 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.
•Use appropriate safety gear when handling refrigerants.

Symptoms

•AC compressor does not engage
•Warm air is emitted from the vents
•AC system makes unusual noises (e.g., clicking or hissing)
•Poor airflow from the vents
•AC light on the dashboard is illuminated or blinking
•Increased cabin humidity

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC-related issues.
2
Inspect the AC refrigerant levels using a refrigerant gauge to determine if the system is low on refrigerant.
3
Check for any visible leaks in the AC system components (hoses, connections, condenser).
4
Test the AC compressor operation by checking the electrical connections and fuses.
5
Inspect the cabin air filter for clogs or blockages that could restrict airflow.
6
Evaluate the AC control settings and ensure they are correctly set to the cooling mode.

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
•Refrigerant gauge
•Socket set
•Torque wrench
•AC compressor removal tool

Parts Required

•Refrigerant (R-134a)
•AC compressor (if faulty)
•Cabin air filter

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC-related issues.
2
Inspect the AC refrigerant levels using a refrigerant gauge to determine if the system is low on refrigerant.
3
Check for any visible leaks in the AC system components (hoses, connections, condenser).
4
Test the AC compressor operation by checking the electrical connections and fuses.
5
Inspect the cabin air filter for clogs or blockages that could restrict airflow.
6
Evaluate the AC control settings and ensure they are correctly set to the cooling mode.

Solution

1. Preparation

Gather tools and parts required.
Ensure the vehicle is parked on a level surface and the engine is turned off.
Disconnect the battery to prevent electrical shock or short circuits.

2. Recharge Refrigerant

Tools Required: Refrigerant gauge, refrigerant canister, hose with gauge.
Attach the refrigerant gauge to the low-pressure service port.
If refrigerant levels are low, follow the instructions on the refrigerant canister to recharge the system.
Ensure to use the correct type of refrigerant (R-134a for E170).

3. Repair or Replace AC Compressor (if faulty)

Tools Required: Socket set, torque wrench, AC compressor removal tool.
Remove the serpentine belt from the AC compressor.
Disconnect the electrical connector and refrigerant lines from the compressor.
Unbolt the compressor from its mounting bracket and remove it from the vehicle.
Install the new or repaired compressor by reversing the removal steps, ensuring all connections are tight and secure.
Reinstall the serpentine belt, ensuring proper alignment.

4. Inspect and Replace Cabin Air Filter

Tools Required: None specifically, but may need screwdrivers if there are covers.
Locate the cabin air filter compartment (typically behind the glove box).
Remove the cover and take out the old cabin air filter.
Inspect for dirt and debris; replace with a new filter if necessary.
Reassemble the cover securely.

5. Reconnect Battery

Reconnect the negative terminal of the battery.
Start the engine and test the AC system to ensure it is blowing cold air.