how to fix the AC that's not getting cold 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

599 words

Problem Statement

Learn how to diagnose and fix AC not getting cold in Toyota Corolla E170 (2013-2019). 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 starting work on the AC system.

Symptoms

•AC vent temperature is warm or hot
•AC compressor does not engage
•Unusual noises from the AC system
•Increased cabin humidity
•AC clutch cycling on and off frequently

Diagnostic Steps

1
Scan the vehicle’s computer for any error codes related to the AC system using an OBD-II scanner.
2
Check the refrigerant level using a manifold gauge set to determine if it is low or overcharged.
3
Inspect the AC compressor for any visible damage or signs of wear.
4
Verify the functionality of the AC clutch by checking for engagement when the AC is turned on.
5
Examine the AC relay and fuses for continuity using a multimeter.
6
Inspect the cabin air filter for obstructions that may restrict 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
•Multimeter
•Socket set
•Torque wrench
•Safety goggles

Parts Required

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

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Diagnostic Steps

1
Scan the vehicle’s computer for any error codes related to the AC system using an OBD-II scanner.
2
Check the refrigerant level using a manifold gauge set to determine if it is low or overcharged.
3
Inspect the AC compressor for any visible damage or signs of wear.
4
Verify the functionality of the AC clutch by checking for engagement when the AC is turned on.
5
Examine the AC relay and fuses for continuity using a multimeter.
6
Inspect the cabin air filter for obstructions that may restrict airflow.

Solution

1. Preparation

Gather tools: OBD-II scanner, manifold gauge set, multimeter, socket set, and safety goggles.
Ensure the vehicle is parked on a level surface and the engine is off before starting work.

2. Recharge the AC System

Tools Required: Manifold gauge set, refrigerant (R-134a)
Connect the manifold gauge set to the AC service ports (low and high side).
Check the current pressure readings; note if the low side is below 30 psi.
If low, follow these sub-steps:
1. Start the engine and turn the AC to maximum cooling.
2. Open the low side valve on the manifold gauge set.
3. Add refrigerant until the low side pressure reaches 30-40 psi.
4. Close the valve and monitor the system.

3. Replace AC Compressor (if needed)

Tools Required: Socket set, torque wrench, AC compressor replacement part, sealant.
Disconnect the negative battery cable.
Remove the drive belt from the AC compressor by loosening the tensioner.
Disconnect electrical connectors and refrigerant lines from the compressor.
Remove the mounting bolts securing the compressor and remove the unit.
Install the new compressor by reversing the removal steps, ensuring all seals are in place.
Torque the mounting bolts to the manufacturer’s specifications.

4. Inspect and Replace AC Relay (if needed)

Tools Required: Multimeter
Locate the AC relay in the fuse box (refer to owner's manual for location).
Remove the relay and test for continuity with a multimeter.
If the relay is faulty, replace it with a new one and ensure it fits securely.