why does my AC not blow cold air in Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

514 words

Problem Statement

Learn how to diagnose and fix AC not blowing cold 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 working near the radiator or AC components.

Symptoms

•AC system blows warm or ambient air
•AC compressor not engaging
•Unusual noises from the AC system (e.g., hissing or clicking)
•Condenser or evaporator is cold to the touch
•AC warning light illuminated on dashboard

Diagnostic Steps

1
Check the AC system fuse for continuity with a multimeter.
2
Scan the vehicle’s computer for any trouble codes relating to the AC system.
3
Inspect the AC compressor visually for signs of damage or leaks.
4
Use a manifold gauge set to check the refrigerant pressure in the system.
5
Verify the AC controls and settings for proper operation.

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

•Multimeter
•Manifold gauge set
•Socket set
•Screwdrivers

Parts Required

•AC fuse (if blown)
•Refrigerant (R134a or as specified)
•AC compressor (if defective)

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Diagnostic Steps

1
Check the AC system fuse for continuity with a multimeter.
2
Scan the vehicle’s computer for any trouble codes relating to the AC system.
3
Inspect the AC compressor visually for signs of damage or leaks.
4
Use a manifold gauge set to check the refrigerant pressure in the system.
5
Verify the AC controls and settings for proper operation.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace the AC Fuse

Locate the fuse box (usually under the dashboard or in the engine compartment).
Remove the cover and check the AC fuse.
If blown, replace it with a new fuse of the same amperage.

3. Recharge the AC System

Connect the manifold gauge set to the low and high-pressure service ports.
Check the refrigerant levels; if low, proceed to recharge.
Follow the refrigerant manufacturer's instructions to add refrigerant until the system reaches the correct pressure levels (typically around 30-40 psi on low side and 200-250 psi on high side).

4. Replace the AC Compressor (if necessary)

If the compressor is not engaging, remove the serpentine belt.
Disconnect the electrical connector and refrigerant lines from the compressor.
Remove mounting bolts and take out the compressor.
Install the new compressor by reversing the removal steps, ensuring all seals are properly seated and new O-rings are used.

5. Test the AC System

Reconnect the battery.
Start the vehicle and turn on the AC to the maximum setting.
Monitor the system with the manifold gauge to ensure it is operating within normal pressures.