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

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

603 words

Problem Statement

Learn how to diagnose and fix AC blowing warm air 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

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the hood to prevent burns.
•Handle refrigerants with care and ensure compliance with environmental regulations regarding recovery and disposal.

Symptoms

•AC compressor not engaging
•Warm air blowing from AC vents
•Reduced airflow from vents
•Unusual noises from the AC compressor
•AC control lights flashing or unresponsive

Diagnostic Steps

1
Check the AC settings to ensure it is set to 'cool' and the temperature is adjusted correctly.
2
Inspect the AC compressor visually for leaks or damage.
3
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the AC system.
4
Measure the refrigerant pressure using a manifold gauge set to determine if levels are adequate.
5
Inspect fuses and relays associated with the AC system for any failures.
6
Check the AC condenser for any debris or obstruction 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
•Torque wrench
•Refrigerant recovery machine

Parts Required

•Refrigerant (R-134a)
•AC compressor (if faulty)
•AC condenser (if damaged)
•Cabin air filter (if needed)

Related Faults

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Diagnostic Steps

1
Check the AC settings to ensure it is set to 'cool' and the temperature is adjusted correctly.
2
Inspect the AC compressor visually for leaks or damage.
3
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the AC system.
4
Measure the refrigerant pressure using a manifold gauge set to determine if levels are adequate.
5
Inspect fuses and relays associated with the AC system for any failures.
6
Check the AC condenser for any debris or obstruction that may affect airflow.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface, and the engine is turned off.
Disconnect the battery to ensure safety while working with electrical components.

2. Inspect and Replace Refrigerant

Attach the manifold gauge set to the AC service ports.
Check the low and high side pressures; if low, proceed to recharge.
Recover any remaining refrigerant using a recovery machine if applicable.
Inject the correct type and amount of refrigerant into the system (usually R-134a for this model).

3. Inspect and Replace AC Compressor

If the compressor is not engaging, check the electrical connections and fuses.
Remove the serpentine belt using a socket wrench to relieve tension on the tensioner.
Disconnect the AC lines from the compressor using appropriate wrenches (ensure to recover refrigerant first).
Remove the bolts securing the compressor to the engine block and take out the compressor.
Install the new compressor, ensuring proper alignment and torque specifications (typically around 15-20 lb-ft).
Reconnect the AC lines and reattach the serpentine belt.

4. Check and Replace AC Condenser

Visually inspect the condenser for any damage or blockage.
If damaged, remove the front grille and any supports to access the condenser.
Disconnect the refrigerant lines and electrical connectors from the condenser.
Remove the mounting bolts and take out the condenser.
Install the new condenser, reconnect lines, and ensure connections are tight.