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

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

508 words

Problem Statement

Learn how to diagnose and fix AC blowing hot air in 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.
•Follow local regulations for refrigerant recovery and disposal.

Symptoms

•AC compressor does not engage
•Warm air is emitted from the vents
•AC system makes unusual noises (e.g., hissing, clicking)
•Poor airflow from the vents
•AC warning light illuminated (if equipped)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any system faults.
2
Check the refrigerant levels to ensure the AC system is properly charged.
3
Inspect the AC compressor for signs of damage or failure.
4
Examine the AC clutch to confirm it engages when the AC is turned on.
5
Inspect the cabin air filter for clogs that may obstruct airflow.
6
Check for leaks in the AC system using UV dye or an electronic leak detector.

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
•Refrigerant gauge set
•Basic hand tools
•UV leak detection kit

Parts Required

•AC refrigerant (R-134a)
•AC compressor (if replacement needed)
•AC clutch (if replacement needed)
•Cabin air filter

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any system faults.
2
Check the refrigerant levels to ensure the AC system is properly charged.
3
Inspect the AC compressor for signs of damage or failure.
4
Examine the AC clutch to confirm it engages when the AC is turned on.
5
Inspect the cabin air filter for clogs that may obstruct airflow.
6
Check for leaks in the AC system using UV dye or an electronic leak detector.

Solution

1. Preparation

Gather tools: OBD-II scanner, refrigerant gauge set, basic hand tools, UV leak detection kit.
Disconnect the battery to ensure safety while working on the AC system.

2. Recharge Refrigerant

Connect the refrigerant gauge set to the low and high-pressure ports.
Check the pressure readings; if low, proceed to recharge the system.
Use the appropriate refrigerant (R-134a for this model) and fill to manufacturer specifications.
Monitor the pressure while adding refrigerant to avoid overcharging.

3. Repair or Replace Faulty Components

AC Compressor:
- If the compressor is not engaging, inspect electrical connections and fuses.
- If faulty, remove the AC compressor by:
  - Disconnecting the refrigerant lines (be mindful of refrigerant recovery regulations).
  - Unbolting the compressor from the engine block.
  - Installing a new compressor by reversing the removal steps, ensuring proper torque specifications.
AC Clutch:
- If the clutch does not engage, check the electrical circuit for power.
- Replace the clutch coil if defective, following similar removal and installation procedures as the compressor.

4. Inspect and Replace Cabin Air Filter

Locate the cabin air filter housing (usually behind the glove box).
Remove the cover and take out the old filter.
Install a new cabin air filter, ensuring it is oriented correctly.