my Toyota Corolla E170 (2013-2019) AC only blows hot air what’s wrong

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

590 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 components.
•Wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC compressor not engaging
•Strange noises coming from the AC unit
•AC system not producing cold air
•Increased cabin temperature
•Presence of any unusual odors from the vents

Diagnostic Steps

1
Inspect the AC system for any visible leaks, particularly around hoses and connections.
2
Check the AC refrigerant level using a gauge to determine if it is low or empty.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Test the AC compressor operation by observing if it engages when the AC is turned on.
5
Inspect the AC fuse and relay for continuity and functionality.
6
Check the cabin air filter for blockage that could affect airflow.

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

•AC refrigerant kit
•OBD-II scanner
•Socket set
•Torque wrench
•Flathead screwdriver

Parts Required

•AC refrigerant (R-134a or compatible)
•AC compressor (if replacement is necessary)
•Cabin air filter

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Diagnostic Steps

1
Inspect the AC system for any visible leaks, particularly around hoses and connections.
2
Check the AC refrigerant level using a gauge to determine if it is low or empty.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Test the AC compressor operation by observing if it engages when the AC is turned on.
5
Inspect the AC fuse and relay for continuity and functionality.
6
Check the cabin air filter for blockage that could affect airflow.

Solution

1. Preparation

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

2. Recharge Refrigerant

Tools Required: AC refrigerant kit, refrigerant (R-134a or as specified for your model).
- Locate the low-pressure service port on the AC system.
- Connect the refrigerant gauge to the low-pressure service port.
- Follow the instructions on the refrigerant can to add refrigerant until the correct pressure is achieved (typically around 30-40 PSI).
- Disconnect the gauge and secure the service port cap.

3. Replace AC Compressor (if necessary)

Tools Required: Socket set, wrenches, AC compressor replacement part, new o-rings, torque wrench.
- Remove the serpentine belt by releasing tension from the tensioner.
- Disconnect the AC compressor electrical connector and any hoses connected to the compressor.
- Unbolt the AC compressor from its mounting bracket.
- Install the new AC compressor by reversing the removal steps, ensuring new o-rings are used on the hoses to prevent leaks.
- Torque the bolts to the manufacturer's specifications.

4. Replace Cabin Air Filter (if blocked)

Tools Required: Flathead screwdriver (if required for cover removal).
- Locate the cabin air filter compartment (usually behind the glove box).
- Remove the cover and take out the old cabin air filter.
- Insert the new cabin air filter, ensuring the airflow direction matches the markings.
- Reattach the cover.

5. Test the System

Reconnect the vehicle battery.
Start the engine and turn on the AC to the maximum setting.
Monitor the AC system for proper cooling and check for any unusual noises or odors.