why is my Toyota Corolla E170 (2013-2019) AC not blowing cold air anymore

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

503 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold air in a 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.
•Handle refrigerants with care; follow local regulations regarding disposal.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Unusual noises from the AC unit
•Reduced airflow from the vents
•AC system warning light illuminated

Diagnostic Steps

1
Check the AC settings and ensure it's set to maximum cool and fan speed.
2
Inspect the refrigerant levels using a manifold gauge set.
3
Scan for error codes using an OBD-II scanner, focusing on AC-related codes.
4
Visually inspect the AC compressor for any signs of damage or leaks.
5
Test the AC relay and fuses for continuity using a multimeter.
6
Examine the cabin air filter for clogs or restrictions.

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
•Basic hand tools

Parts Required

•R-134a refrigerant
•AC compressor
•AC compressor oil

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Diagnostic Steps

1
Check the AC settings and ensure it's set to maximum cool and fan speed.
2
Inspect the refrigerant levels using a manifold gauge set.
3
Scan for error codes using an OBD-II scanner, focusing on AC-related codes.
4
Visually inspect the AC compressor for any signs of damage or leaks.
5
Test the AC relay and fuses for continuity using a multimeter.
6
Examine the cabin air filter for clogs or restrictions.

Solution

1. Preparation

Gather tools: OBD-II scanner, manifold gauge set, multimeter, basic hand tools.
Ensure the vehicle is parked in a safe location with the engine off.
Disconnect the battery for safety.

2. Recharge the AC System

Connect the manifold gauge set to the low and high-pressure ports of the AC system.
Check the refrigerant levels; if low, proceed to recharge.
Use the appropriate refrigerant type as specified in the owner's manual (typically R-134a).
Open the low-pressure valve on the manifold gauge to allow refrigerant to flow into the system until the correct pressure is achieved.
Monitor the pressure readings on the gauge to avoid overcharging.

3. Replace the AC Compressor (if faulty)

Remove the drive belt by loosening the tensioner pulley.
Disconnect the wires and hoses from the AC compressor, noting their positions for reassembly.
Remove the AC compressor mounting bolts and take out the compressor.
Install the new compressor by reversing the removal steps and ensuring proper torque specifications (typically around 18-25 ft-lbs).
Reattach the drive belt and reconnect the battery.

4. Test the AC System

Start the engine and set the AC to maximum cool.
Monitor the temperature of the air blowing from the vents using a thermometer.
Check for any leaks around the compressor and hoses.