how to fix the air conditioning that is blowing hot air in my Toyota Corolla E170 (2013-2019)

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 the A/C blowing hot air in your Toyota Corolla E170 (2013-2019). Step-by-step guide with tools and parts required.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the system to depressurize before servicing the A/C system to avoid refrigerant exposure.

Symptoms

•A/C system blows warm air
•A/C compressor not engaging
•Unusual noises from the A/C system
•A/C warning light illuminated
•Reduced airflow from vents

Diagnostic Steps

1
Check the A/C system for refrigerant levels using a manifold gauge set.
2
Inspect the A/C compressor for engagement and any visible damage.
3
Examine the A/C fuses and relays for continuity.
4
Test the A/C control module for proper operation using a scan tool.
5
Look for any signs of leaks in the A/C system, such as oil stains or dye.
6
Inspect the cabin air filter for blockage or contamination.

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

•Manifold gauge set
•Socket set
•Torque wrench
•Refrigerant canister
•Gloves

Parts Required

•Refrigerant (R134a)
•A/C compressor
•Cabin air filter

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Diagnostic Steps

1
Check the A/C system for refrigerant levels using a manifold gauge set.
2
Inspect the A/C compressor for engagement and any visible damage.
3
Examine the A/C fuses and relays for continuity.
4
Test the A/C control module for proper operation using a scan tool.
5
Look for any signs of leaks in the A/C system, such as oil stains or dye.
6
Inspect the cabin air filter for blockage or contamination.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant canister, gloves.
Steps:
1. Connect the manifold gauge set to the service ports on the A/C system (high and low sides).
2. Start the engine and turn the A/C to maximum setting.
3. Check the pressure readings; if low, proceed to recharge.
4. Attach the refrigerant canister to the low-pressure side and open the valve to allow refrigerant to flow until the appropriate pressure is reached.
5. Disconnect the manifold gauge set carefully.

3. Replace A/C Compressor (if necessary)

Tools Required: Socket set, torque wrench, A/C compressor oil, new A/C compressor.
Steps:
1. Remove the drive belt from the A/C compressor.
2. Disconnect electrical connectors and refrigerant lines from the compressor.
3. Unbolt the compressor from the mounting brackets and remove it from the engine bay.
4. Install the new compressor in reverse order of removal, ensuring to apply the correct amount of A/C compressor oil as specified in the vehicle manual.
5. Reconnect the refrigerant lines and electrical connectors, and reattach the drive belt.

4. Replace Cabin Air Filter (if clogged)

Tools Required: None specifically required, but a flathead screwdriver may be helpful.
Steps:
1. Access the cabin air filter by removing the glove box or cover panel (refer to the vehicle manual).
2. Remove the old filter and inspect for dirt or blockage.
3. Install the new cabin air filter, ensuring it is oriented correctly according to airflow direction.
4. Reassemble the glove box or cover panel.