my Toyota Corolla E170 (2013-2019) AC is not blowing cold air, what could be wrong?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

556 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 components.
•Always wear safety glasses and gloves when handling refrigerants and AC components.

Symptoms

•AC system blowing warm air
•Unusual noises from the AC compressor
•AC compressor not engaging
•Foul odor coming from the vents
•Decreased airflow from the AC vents
•AC indicator light not illuminating

Diagnostic Steps

1
Check the AC system for any visible leaks around the compressor, hoses, and connections.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Measure the refrigerant pressure using a manifold gauge set to determine if the system is undercharged or overcharged.
4
Inspect the AC compressor for signs of wear or damage, ensuring it engages when the AC is turned on.
5
Check the AC relay and fuses to ensure they are functioning properly.
6
Inspect the cabin air filter for blockage or excessive dirt that may affect airflow.

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
•Socket set
•UV leak detection kit
•Refrigerant canister

Parts Required

•Refrigerant (specific type for Toyota vehicles)
•AC compressor (if necessary)
•AC relay or fuses (if necessary)

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 the compressor, hoses, and connections.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Measure the refrigerant pressure using a manifold gauge set to determine if the system is undercharged or overcharged.
4
Inspect the AC compressor for signs of wear or damage, ensuring it engages when the AC is turned on.
5
Check the AC relay and fuses to ensure they are functioning properly.
6
Inspect the cabin air filter for blockage or excessive dirt that may affect airflow.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle's battery to ensure safety while working on the electrical components.

2. Locate and Repair Leaks

Tools Needed: UV leak detection kit, refrigerant dye.
Apply the UV dye to the refrigerant system and run the AC for 10-15 minutes.
Use a UV light to inspect for leaks; repair any identified leaks with appropriate patches or replacements.

3. Recharge the AC System

Tools Needed: Manifold gauge set, refrigerant canister.
Connect the manifold gauge set to the low and high-pressure ports of the AC system.
If the system is low on refrigerant, follow the manufacturer's specifications to add the correct type and amount of refrigerant.
Monitor the pressures to ensure they are within the acceptable range.

4. Replace Components as Needed

Tools Needed: Socket set, torque wrench.
If the AC compressor or any other components are found defective, remove them as follows:
- Disconnect electrical connectors.
- Remove mounting bolts using a socket set.
- Replace with new parts, ensuring to torque bolts to manufacturer specifications.
- Reconnect the electrical connectors.

5. System Test

Reconnect the battery.
Start the vehicle and turn on the AC to verify that cold air is being produced.
Check for any unusual noises and monitor for proper operation.