how to fix the AC not blowing cold air in my Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

632 words

Problem Statement

Learn how to diagnose and fix AC not blowing cold air 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

•Always wear safety glasses and gloves when handling refrigerants.
•Ensure proper disposal of old refrigerants in accordance with local regulations.
•Disconnect the battery before working on any electrical components.

Symptoms

•AC compressor does not engage
•Weak airflow from AC vents
•AC blows warm or hot air
•Unusual noises from the AC system (e.g., clicking or hissing)
•Dashboard AC indicator light is off or flashing

Diagnostic Steps

1
Inspect the AC system for visible leaks, especially around hoses and connections.
2
Check the refrigerant level using a gauge set on the low and high pressure ports.
3
Scan the vehicle's onboard computer for any error codes related to the AC system using an OBD-II scanner.
4
Verify the operation of the AC compressor by checking the electrical connections and fuses.
5
Test the AC control switch and climate control module for proper function.
6
Examine the cabin air filter for clogs or blockages 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
•Refrigerant gauge set
•Multimeter
•Basic hand tools (socket set, screwdrivers)

Parts Required

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

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Diagnostic Steps

1
Inspect the AC system for visible leaks, especially around hoses and connections.
2
Check the refrigerant level using a gauge set on the low and high pressure ports.
3
Scan the vehicle's onboard computer for any error codes related to the AC system using an OBD-II scanner.
4
Verify the operation of the AC compressor by checking the electrical connections and fuses.
5
Test the AC control switch and climate control module for proper function.
6
Examine the cabin air filter for clogs or blockages that may restrict airflow.

Solution

1. Preparation

Tools Required: OBD-II scanner, refrigerant gauge set, multimeter, basic hand tools (socket set, screwdrivers).
Ensure the vehicle is parked on a level surface and the engine is off before starting any repairs.

2. Check Refrigerant Levels

Sub-steps:
1. Connect the refrigerant gauge set to the low and high-pressure ports of the AC system.
2. Read the pressure levels; refer to the manufacturer's specifications for normal range.
3. If low, proceed to recharge the system with the appropriate refrigerant type (typically R-134a for this model).
4. Add refrigerant slowly while monitoring the pressure gauge to avoid overcharging.

3. Inspect and Replace Components

Sub-steps:
1. If the compressor doesn’t engage, check the fuse and relay related to the AC system.
2. Use a multimeter to check for voltage at the compressor connector; if no voltage, trace back to the switch and control module.
3. If the compressor is faulty, disconnect the electrical connector and remove the compressor from the engine bay (remove any mounting bolts, and disconnect hoses).
4. Replace with a new or refurbished AC compressor, ensuring to replace any O-rings and using the correct torque specifications for mounting bolts.

4. Clean or Replace Cabin Air Filter

Sub-steps:
1. Locate the cabin air filter (usually behind the glove box).
2. Remove the glove box to access the filter compartment.
3. Remove the existing cabin air filter and inspect for dirt and debris; replace if clogged.
4. Install a new cabin air filter ensuring it is oriented correctly.

5. Test and Recharge System

Sub-steps:
1. Start the engine and activate the AC system to the maximum setting.
2. Monitor the AC performance and check for cold air blowing from the vents.
3. If necessary, adjust refrigerant levels again based on pressure readings.