how to fix the AC not working 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

551 words

Problem Statement

Learn how to diagnose and fix AC issues 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 components.
•Allow the engine to cool before inspecting or working on the AC system.

Symptoms

•AC system blows warm air
•Unusual noises from the AC compressor
•AC compressor does not engage
•Foul smell when the AC is turned on
•Increased humidity inside the cabin
•Dashboard warning lights illuminated

Diagnostic Steps

1
Check the AC system's refrigerant level using a gauge manifold set.
2
Inspect the AC compressor for any visible damage or leaks.
3
Test the AC compressor clutch to ensure it engages when the AC is turned on.
4
Scan for any diagnostic trouble codes (DTCs) using an OBD-II scanner.
5
Inspect the AC fuse and relay for continuity and proper operation.
6
Verify cabin air filter condition; replace if clogged or dirty.

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 manifold
•Socket set
•Screwdrivers
•Multimeter

Parts Required

•AC refrigerant
•AC compressor (if needed)
•Cabin air filter
•Fuses/relays (if faulty)

Related Faults

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Diagnostic Steps

1
Check the AC system's refrigerant level using a gauge manifold set.
2
Inspect the AC compressor for any visible damage or leaks.
3
Test the AC compressor clutch to ensure it engages when the AC is turned on.
4
Scan for any diagnostic trouble codes (DTCs) using an OBD-II scanner.
5
Inspect the AC fuse and relay for continuity and proper operation.
6
Verify cabin air filter condition; replace if clogged or dirty.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the battery to ensure safety when working with electrical components.

2. Recharge the AC System

Tools Required: Refrigerant gauge manifold, refrigerant canister.
Sub-steps:
1. Connect the low-pressure gauge to the service port on the AC system.
2. Check the pressure reading. If low, proceed to add refrigerant.
3. Start the engine and turn the AC to maximum setting.
4. Add refrigerant slowly until the correct pressure is reached, as indicated by the gauge.

3. Inspect and Replace Components

Tools Required: Socket set, screwdrivers, multimeter.
Sub-steps:
1. If the compressor does not engage, check the electrical connections and wiring for the compressor clutch.
2. If faulty, replace the AC compressor with a new or remanufactured unit.
  - Remove any belts connected to the compressor.
  - Disconnect electrical connectors and refrigerant lines.
  - Unbolt the compressor from its mounting.
  - Install the new compressor in reverse order.
3. Replace any blown fuses or faulty relays identified during diagnostics.

4. Clean or Replace Cabin Air Filter

Tools Required: None required for filter replacement.
Sub-steps:
1. Locate the cabin air filter access panel (usually behind the glove compartment).
2. Open the panel and remove the old filter.
3. Install a new cabin air filter, ensuring it is oriented correctly.