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

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

541 words

Problem Statement

Learn how to diagnose and fix the A/C not blowing cold 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

•Ensure the engine is off and the A/C system is depressurized before connecting or disconnecting the manifold gauges.
•Wear safety goggles and gloves when handling refrigerants.

Symptoms

•A/C system running but air temperature is warm
•A/C compressor not engaging
•Unusual noises from the A/C system
•Presence of refrigerant leaks (oily residue around A/C components)
•A/C system cycling on and off frequently
•Fogging or humidity inside vehicle with A/C on

Diagnostic Steps

1
Check the A/C system settings to ensure it is set to the coldest temperature and maximum fan speed.
2
Use an OBD-II scanner to check for any error codes related to the A/C system.
3
Inspect the A/C compressor for proper engagement while the A/C is turned on.
4
Measure the refrigerant pressure using a manifold gauge set to determine if levels are low.
5
Check for visible leaks around A/C components such as hoses and the condenser.
6
Inspect the cabin air filter for clogs that may restrict 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

•A/C manifold gauge set
•Refrigerant canister
•Basic hand tools (screwdrivers, wrenches)

Parts Required

•Refrigerant (as required)
•Cabin air filter (if needed)
•Replacement A/C components (if leaks or damage found)

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Diagnostic Steps

1
Check the A/C system settings to ensure it is set to the coldest temperature and maximum fan speed.
2
Use an OBD-II scanner to check for any error codes related to the A/C system.
3
Inspect the A/C compressor for proper engagement while the A/C is turned on.
4
Measure the refrigerant pressure using a manifold gauge set to determine if levels are low.
5
Check for visible leaks around A/C components such as hoses and the condenser.
6
Inspect the cabin air filter for clogs that may restrict airflow.

Solution

1. Preparation

Gather tools and parts: A/C manifold gauge set, refrigerant, basic hand tools, leak detection dye, and UV light if needed.
Ensure the vehicle is parked on a level surface, and the engine is turned off before starting repairs.

2. Check and Recharge Refrigerant

Connect Manifold Gauges: Attach the low and high-pressure gauges to the A/C service ports.
Read Pressure Levels: Note the pressure readings and evaluate them against the manufacturer's specifications.
Add Refrigerant: If low, connect the refrigerant canister to the low-pressure side, and slowly add refrigerant while monitoring the pressure.
Monitor Compressor Engagement: Ensure the A/C compressor engages while adding refrigerant.

3. Inspect and Repair Components

Inspect A/C Compressor: Check for any signs of wear or damage. If not engaging, test the electrical connections and fuses.
Check for Leaks: Use UV dye if necessary to identify leaks. If found, replace the affected component (e.g., hoses, compressor).
Replace Cabin Air Filter: If clogged, remove the old filter and install a new one according to the owner's manual.

4. System Test

Run A/C System: Start the engine and turn on the A/C to the maximum setting.
Check Temperature: Use a thermometer to measure air temperature from the vents; it should be significantly cooler than ambient temperature.