how to fix the AC that blows warm 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

545 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air in Toyota Corolla E170. Step-by-step guide with symptoms, diagnostic steps, 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
•Allow the engine to cool before performing any repairs to prevent burns

Symptoms

•AC system blowing warm air
•AC compressor not engaging
•Strange noises from the AC unit
•Condensation inside the vehicle
•Foul odor when AC is turned on

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner
2
Inspect the AC compressor visually for signs of damage or leaks
3
Check refrigerant levels using a manifold gauge set to ensure the system is properly charged
4
Test the AC relay and fuses to verify they are functioning correctly
5
Inspect the cabin air filter for clogs that could restrict airflow
6
Evaluate the AC controls for proper operation and functionality

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 (R-134a)
•Socket set
•Torque wrench
•Screwdriver

Parts Required

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

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner
2
Inspect the AC compressor visually for signs of damage or leaks
3
Check refrigerant levels using a manifold gauge set to ensure the system is properly charged
4
Test the AC relay and fuses to verify they are functioning correctly
5
Inspect the cabin air filter for clogs that could restrict airflow
6
Evaluate the AC controls for proper operation and functionality

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the vehicle's battery to avoid electrical shock.

2. Recharge the AC System

Tools Required: Manifold gauge set, refrigerant (R-134a), safety glasses, gloves.
Connect the manifold gauges to the low and high-pressure service ports.
Start the engine and turn the AC to the maximum setting.
Check the readings on the gauge. If low, proceed to recharge.
Add refrigerant until the system reaches proper levels as indicated on the gauge.

3. Replace the Cabin Air Filter

Tools Required: Screwdriver (if applicable).
Locate the cabin air filter access panel, usually behind the glove box or under the dashboard.
Remove the access panel or glove box to expose the filter.
Take out the old filter and replace it with a new one, ensuring it is oriented correctly.

4. Replace the AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, refrigerant recovery machine.
Recover the refrigerant using a recovery machine.
Disconnect electrical connectors and remove the mounting bolts from the AC compressor.
Remove the old compressor and install the new one, tightening bolts to manufacturer specifications.
Reconnect electrical connectors and recharge the AC system.