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

624 words

Problem Statement

Learn how to diagnose and fix AC not blowing cold 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.
•Always wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC blowing warm air
•AC compressor not engaging
•Unusual noises from the AC system
•Foul odor from the vents
•Reduced airflow from the AC vents
•AC warning light illuminated on the dashboard

Diagnostic Steps

1
Check the AC system settings to ensure the temperature is set to the coldest setting and the recirculation mode is activated.
2
Inspect the AC compressor for any signs of damage or leaks.
3
Use an OBD-II scanner to check for any trouble codes related to the AC system.
4
Measure the refrigerant level using a refrigerant gauge set.
5
Inspect the AC condenser and evaporator for blockages or debris.
6
Check electrical connections and fuses related to the AC system.

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
•Socket set
•Wrench set
•Vacuum cleaner
•Soft brush

Parts Required

•Refrigerant canister (R134a)
•New AC compressor (if needed)
•Refrigerant oil
•Cabin air filter (if needed)

Related Faults

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Diagnostic Steps

1
Check the AC system settings to ensure the temperature is set to the coldest setting and the recirculation mode is activated.
2
Inspect the AC compressor for any signs of damage or leaks.
3
Use an OBD-II scanner to check for any trouble codes related to the AC system.
4
Measure the refrigerant level using a refrigerant gauge set.
5
Inspect the AC condenser and evaporator for blockages or debris.
6
Check electrical connections and fuses related to the AC system.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface, and the engine is turned off.
Disconnect the battery to ensure safety while working on electrical components.

2. Recharge Refrigerant

Tools Required: Refrigerant gauge set, refrigerant canister (R134a), safety goggles, gloves.
Instructions:
1. Connect the low-pressure side of the refrigerant gauge set to the AC service port.
2. Start the engine and turn the AC to maximum cold with the fan on high.
3. Open the valve on the refrigerant canister and allow refrigerant to flow into the system until the gauge indicates the correct pressure.
4. Close the valve and disconnect the gauge set.
5. Monitor for any signs of leaks after recharging.

3. Replace AC Compressor (if necessary)

Tools Required: Socket set, wrench set, AC compressor removal tool, new AC compressor, refrigerant oil.
Instructions:
1. Remove the drive belt by loosening the tensioner.
2. Disconnect electrical connectors and refrigerant lines from the AC compressor.
3. Unbolt the AC compressor from its mount and carefully remove it from the engine bay.
4. Prepare the new AC compressor by adding the specified amount of refrigerant oil.
5. Install the new AC compressor in reverse order of removal, ensuring all bolts are tightened to the manufacturer's torque specifications.
6. Reconnect the refrigerant lines and electrical connectors.

4. Inspect and Clean AC Components

Tools Required: Vacuum cleaner, soft brush, cleaning solution.
Instructions:
1. Check the AC condenser and evaporator for dirt and debris.
2. Use a vacuum cleaner or soft brush to clean any obstructive material from the condenser fins.
3. Inspect the cabin air filter, and replace it if it’s clogged or dirty.