why does my Toyota Corolla E170 (2013-2019) AC compressor run continuously?

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

488 words

Problem Statement

Learn how to diagnose and fix the continuously running AC compressor in your 2013-2019 Toyota Corolla E170. Step-by-step guide with diagnostic procedures.

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC compressor operates without interruption
•Cabin temperature fails to cool adequately
•Increased engine load and reduced fuel economy
•Unusual noises from the AC compressor or associated components
•AC system blowing warm air intermittently

Diagnostic Steps

1
Check for any error codes using an OBD-II scanner.
2
Inspect the AC control module for signs of malfunction or failure.
3
Examine the AC refrigerant level and check for leaks in the system.
4
Test the AC pressure switch for proper functionality.
5
Inspect the climate control settings to ensure they are set correctly.
6
Verify the operation of the AC relay.

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
•Multimeter
•Socket set
•Screwdrivers

Parts Required

•AC refrigerant (R-134a)
•AC pressure switch (if needed)
•AC relay (if needed)

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Diagnostic Steps

1
Check for any error codes using an OBD-II scanner.
2
Inspect the AC control module for signs of malfunction or failure.
3
Examine the AC refrigerant level and check for leaks in the system.
4
Test the AC pressure switch for proper functionality.
5
Inspect the climate control settings to ensure they are set correctly.
6
Verify the operation of the AC relay.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Test the AC System

Check Refrigerant Level
- Use a refrigerant gauge to measure the low and high side pressures.
- If low, recharge the system with the appropriate refrigerant (R-134a for 2013-2019 Corolla).
- If there are signs of a leak, repair the leak before recharging.
Test the AC Pressure Switch
- Locate the pressure switch on the AC line.
- Disconnect the electrical connector and use a multimeter to check for continuity.
- Replace the switch if it shows no continuity when the AC is activated.
Inspect the AC Control Module
- Check the control module for any visible damage or burnt connections.
- If needed, reprogram or replace the module according to manufacturer specifications.

3. Verify AC Relay Operation

Locate the AC Relay
- Refer to the owner's manual for the exact location in the fuse box.
Test the Relay
- Remove the relay and use a multimeter to check for continuity.
- Replace the relay if it is faulty.

4. Reconnect Battery and Test

Reconnect the negative battery terminal.
Start the vehicle and activate the AC system to check if the compressor runs continuously.