why does 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

528 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 recover refrigerant properly; do not vent to the atmosphere.
•Wear safety goggles and gloves when handling refrigerants and AC components.

Symptoms

•AC system blowing warm or hot air
•AC compressor not engaging
•Unusual noises from the AC unit when activated
•Visible signs of refrigerant leaks (oil spots or dye)
•Poor airflow from the AC vents

Diagnostic Steps

1
Check the AC system for error codes using an OBD-II scanner.
2
Inspect the AC compressor for engagement when AC is turned on.
3
Verify refrigerant levels using a manifold gauge set.
4
Examine the AC condenser for blockages or damage.
5
Inspect the electrical connections and fuses related to the AC system.
6
Check for any signs of refrigerant leaks around hoses and connections.

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 recovery machine
•Manifold gauge set
•Socket set
•Torque wrench

Parts Required

•AC compressor (if defective)
•AC condenser (if damaged)
•Expansion valve (if faulty)
•Refrigerant (R-134a)

Related Faults

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Diagnostic Steps

1
Check the AC system for error codes using an OBD-II scanner.
2
Inspect the AC compressor for engagement when AC is turned on.
3
Verify refrigerant levels using a manifold gauge set.
4
Examine the AC condenser for blockages or damage.
5
Inspect the electrical connections and fuses related to the AC system.
6
Check for any signs of refrigerant leaks around hoses and connections.

Solution

1. Preparation

Gather necessary tools and safety gear.
Ensure the vehicle is parked on a flat surface and the engine is turned off.

2. Recover Refrigerant

Use a refrigerant recovery machine to safely recover any remaining refrigerant from the system.
Connect the recovery machine's hoses to the AC service ports (high and low).

3. Inspect and Replace Components

Compressor Inspection:
- Check the AC compressor for signs of wear or failure.
- If defective, remove the AC compressor:
  - Disconnect the electrical connector.
  - Remove the serpentine belt using a socket set.
  - Unbolt the compressor from its mounting bracket and remove it.
Replace Compressor (if needed):
- Install the new compressor in reverse order of removal.
- Torque the mounting bolts to the manufacturer's specifications (usually around 15-20 ft-lbs).
Condenser and Expansion Valve:
- Inspect the condenser for damage; replace if necessary.
- If the expansion valve is suspected to be faulty, remove it (follow similar steps as compressor removal) and replace it.

4. Recharge AC System

Connect the manifold gauge set to the AC service ports.
Add the appropriate amount of refrigerant (usually R-134a) as per manufacturer specifications (check the label under the hood).
Run the engine and activate the AC to allow the system to circulate the refrigerant.

5. Final Checks

Ensure all electrical connections are secure.
Inspect for any refrigerant leaks post-recharge.