why does my Toyota Corolla E170 (2013-2019) AC blow warm air instead of cold

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

578 words

Problem Statement

Learn how to diagnose and fix the AC blowing warm air issue in your 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 systems.
•Allow the engine to cool before opening any components to prevent burns.

Symptoms

•Warm air blowing from the AC vents
•AC compressor not engaging
•Unpleasant odors from the AC system
•Visible refrigerant leaks under the vehicle
•High-pressure readings on the AC gauge
•Fluctuating temperature from the AC output

Diagnostic Steps

1
Check the AC system for any visible leaks around hoses and connections.
2
Use an OBD-II scanner to check for any fault codes related to the AC system.
3
Inspect the AC compressor for proper operation and listen for unusual noises during engagement.
4
Measure the refrigerant levels using a manifold gauge set.
5
Inspect the AC condenser and evaporator for debris or blockages.
6
Verify the operation of the AC blower motor and climate control settings.

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
•Basic hand tools
•Refrigerant (R-134a)
•AC compressor oil

Parts Required

•AC compressor
•O-rings and seals
•Refrigerant

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the AC system for any visible leaks around hoses and connections.
2
Use an OBD-II scanner to check for any fault codes related to the AC system.
3
Inspect the AC compressor for proper operation and listen for unusual noises during engagement.
4
Measure the refrigerant levels using a manifold gauge set.
5
Inspect the AC condenser and evaporator for debris or blockages.
6
Verify the operation of the AC blower motor and climate control settings.

Solution

1. Preparation

Gather tools and parts: manifold gauge set, refrigerant (R-134a), AC compressor oil (if necessary), basic hand tools.
Disconnect the battery to ensure safety while working on electrical components.

2. Recharge the AC System

Connect Manifold Gauges
- Attach the high and low-pressure hoses from the manifold gauge set to the corresponding ports on the AC system.
- Make sure the gauges are securely connected to avoid leaks.
Check Refrigerant Levels
- Start the engine and turn on the AC to the maximum setting.
- Read the pressure on the gauges. Low readings indicate low refrigerant levels, while high readings may indicate a blockage.
Add Refrigerant
- If low on refrigerant, connect the refrigerant can to the low-pressure side of the manifold gauge.
- Open the valve on the can and allow refrigerant to flow into the system until proper levels are reached (consult manufacturer specifications for exact amount).
Seal and Test
- Once recharged, seal the refrigerant can and disconnect the manifold gauges.
- Recheck the operation of the AC to see if it now blows cold air.

3. Repair or Replace Components

Inspect and Replace Faulty Parts
- If the compressor is not engaging, check the electrical connections and fuses.
- If the compressor is faulty, remove it using appropriate hand tools, and replace it with a new or remanufactured unit.
- Recharge the system after compressor replacement.
Flush and Clean System
- If debris is found in the condenser or evaporator, flush the system to remove blockages.
- Clean the condenser and evaporator with a suitable cleaner, ensuring no residue is left.