how to fix the Toyota Corolla E170 (2013-2019) air conditioning not blowing cold air?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

553 words

Problem Statement

Learn how to diagnose and fix the A/C not blowing cold air in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures 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.
•Wear safety glasses and gloves while handling refrigerants.

Symptoms

•Air conditioning blows warm or hot air
•A/C compressor does not engage
•Unusual noises coming from the A/C compressor
•A/C system cycles on and off frequently
•Ice buildup on A/C components

Diagnostic Steps

1
Check the A/C system for visible leaks using UV dye or a leak detection kit.
2
Use an OBD-II scanner to check for any related error codes.
3
Measure the refrigerant pressure using a manifold gauge set to determine if it is low or high.
4
Inspect the A/C compressor clutch operation when the A/C is turned on.
5
Examine the A/C condenser for obstructions or debris blocking airflow.
6
Verify the operation of the A/C switch and relay.

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
•UV leak detection kit
•Torque wrench
•Basic hand tools (sockets, wrenches)

Parts Required

•Refrigerant (R134a)
•A/C compressor (if defective)
•A/C clutch relay (if needed)
•Hoses or fittings (if damaged)

Related Faults

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Diagnostic Steps

1
Check the A/C system for visible leaks using UV dye or a leak detection kit.
2
Use an OBD-II scanner to check for any related error codes.
3
Measure the refrigerant pressure using a manifold gauge set to determine if it is low or high.
4
Inspect the A/C compressor clutch operation when the A/C is turned on.
5
Examine the A/C condenser for obstructions or debris blocking airflow.
6
Verify the operation of the A/C switch and relay.

Solution

1. Preparation

Tools Required:
- OBD-II scanner
- Manifold gauge set
- UV leak detection kit
- Torque wrench
- Basic hand tools (sockets, wrenches)
Safety Warnings:
- Disconnect the battery before working on electrical components.
- Wear safety glasses and gloves while handling refrigerants.

2. Refrigerant Recharge

Check Refrigerant Level:
- Connect the manifold gauge set to the low-pressure port.
- Read the pressure; if below recommended levels, proceed to recharge.
Evacuate the System (if necessary):
- Use a vacuum pump to evacuate the system to remove moisture and air.
- Run the vacuum pump for at least 30 minutes.
Recharge Refrigerant:
- Attach the refrigerant can to the manifold gauge set.
- Open the low side valve and allow the refrigerant to flow into the system until the correct pressure is achieved.

3. A/C Compressor Inspection

Check Compressor Clutch:
- With the A/C turned on, visually inspect the compressor clutch for engagement.
- If not engaging, replace the compressor relay or check the electrical connections.
Test Compressor Function:
- If the clutch engages but the system is still not cooling, the compressor may be faulty and require replacement.

4. Condenser and Components Check

Clean Condenser:
- Inspect the condenser for debris and clean it using compressed air or a soft brush.
Inspect Hoses and Fittings:
- Check for any signs of wear or leaks in hoses and fittings; replace any damaged components.