my Toyota Corolla E170 (2013-2019) AC is not blowing cold air anymore

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

573 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold air in a 2013-2019 Toyota Corolla E170. Step-by-step guide with tools and 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.
•Follow proper procedures for handling and disposing of refrigerants.

Symptoms

•AC blows warm air instead of cold
•Increased noise from the AC compressor
•AC compressor not engaging
•Foul odor from the AC vents
•Visible refrigerant leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any AC-related faults.
2
Inspect the AC compressor visually for damage or signs of wear.
3
Check the refrigerant levels using a manifold gauge set to determine if it is low.
4
Test the AC system pressure to ensure it is within the manufacturer's specifications.
5
Inspect the AC clutch operation to verify if it engages when the AC is turned on.
6
Examine the cabin air filter for clogs that may 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

•OBD-II scanner
•Manifold gauge set
•Refrigerant scale
•Socket set
•Wrench set
•Screwdriver

Parts Required

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

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any AC-related faults.
2
Inspect the AC compressor visually for damage or signs of wear.
3
Check the refrigerant levels using a manifold gauge set to determine if it is low.
4
Test the AC system pressure to ensure it is within the manufacturer's specifications.
5
Inspect the AC clutch operation to verify if it engages when the AC is turned on.
6
Examine the cabin air filter for clogs that may affect airflow.

Solution

1. Preparation

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

2. Check and Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant (R-134a), refrigerant scale.
Connect the manifold gauges to the low and high-pressure service ports.
Start the vehicle and turn the AC to the maximum setting.
Read the pressures on both gauges. If low, proceed to add refrigerant.
Use the scale to add refrigerant until the system reaches the correct pressure as specified in the vehicle’s manual.

3. Inspect and Replace AC Compressor (if necessary)

Tools Required: Socket set, wrench set, AC compressor replacement.
Remove any components obstructing access to the AC compressor (e.g., belts or brackets).
Disconnect the electrical connector from the AC compressor.
Remove the refrigerant lines from the compressor using appropriate wrenches, ensuring to capture any residual refrigerant according to local regulations.
Unbolt and remove the AC compressor from its mounting location.
Install the new compressor by reversing the removal process, ensuring all connections are secure.

4. Replace Cabin Air Filter

Tools Required: Screwdriver (if applicable), new cabin air filter.
Locate the cabin air filter compartment, usually behind the glove box.
Remove the old cabin air filter and discard it.
Install the new cabin air filter, ensuring it is oriented correctly.

5. Reconnect Battery and Test AC System

Reconnect the vehicle's battery.
Start the vehicle and turn on the AC to check for cold air.
Monitor the AC compressor operation to ensure it engages properly.