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

538 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold air in a 2013-2019 Toyota Corolla E170. Step-by-step guide with symptoms 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 the AC system.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Unusual noises from the AC system (e.g., hissing, clicking)
•AC system cycling on and off frequently
•Reduced air flow from vents
•AC warning light illuminated on the dashboard

Diagnostic Steps

1
Check the AC settings to ensure it's set to the coldest temperature and the AC button is engaged.
2
Inspect the AC system for any visible leaks or damage to hoses and components.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Measure the refrigerant levels using a manifold gauge set to determine if it's low.
5
Test the AC compressor relay and fuses to ensure they are functioning properly.
6
Inspect the cabin air filter for blockages that could impede 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

•Manifold gauge set
•Refrigerant can with gauge
•Socket set
•Torque wrench
•Screwdrivers
•Multimeter
•OBD-II scanner

Parts Required

•Refrigerant (R-134a)
•AC compressor (if faulty)
•AC relay (if faulty)
•Cabin air filter

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Diagnostic Steps

1
Check the AC settings to ensure it's set to the coldest temperature and the AC button is engaged.
2
Inspect the AC system for any visible leaks or damage to hoses and components.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Measure the refrigerant levels using a manifold gauge set to determine if it's low.
5
Test the AC compressor relay and fuses to ensure they are functioning properly.
6
Inspect the cabin air filter for blockages that could impede airflow.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to ensure safety during electrical work.

2. Check and Recharge Refrigerant

Sub-steps:
1. Connect the manifold gauge set to the low and high-pressure ports of the AC system.
2. Read the pressure levels; if low, proceed to recharge.
3. Use a refrigerant can with a gauge, and add refrigerant according to the manufacturer's specifications (usually R-134a).
4. Monitor the pressure during the recharge to avoid overfilling.

Tools Required:

Manifold gauge set
Refrigerant can with gauge

3. Inspect and Replace AC Components

Sub-steps:
1. If the compressor is not engaging, check the AC relay and replace it if defective.
2. Inspect the AC compressor for any signs of wear or damage; replace if necessary.
3. Check the condenser for blockages or damage; clean or replace as needed.
4. Replace the cabin air filter if found clogged.

Tools Required:

Socket set
Torque wrench
Screwdrivers

4. Electrical System Check

Sub-steps:
1. Inspect all fuses related to the AC system and replace any blown fuses.
2. Test the wiring and connectors for continuity and secure connections.
3. If necessary, repair or replace any damaged wiring.

Tools Required:

Multimeter