how to fix my Toyota Corolla E170 (2013-2019) when the AC is not blowing cold

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

584 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold in Toyota Corolla E170 (2013-2019). Step-by-step guide with tools and procedures included.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Properly recover refrigerant from the system if it needs to be discharged

Symptoms

•AC blows warm air instead of cold
•AC compressor not engaging
•Unusual noises from the AC system
•Foul odor from the AC vents
•Increased humidity inside the cabin

Diagnostic Steps

1
Check for refrigerant level using a pressure gauge
2
Scan for error codes using OBD-II scanner
3
Inspect AC compressor for any signs of damage or leaks
4
Examine AC fuses and relays for continuity
5
Test AC controls in the cabin for proper functioning

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 manifold gauge set
•Socket set
•Torque wrench
•Screwdriver set

Parts Required

•R134a refrigerant
•AC compressor (if needed)
•AC expansion valve (if needed)

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Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the battery to avoid electrical shock.

2. Check and Recharge Refrigerant

Tools Required: Refrigerant manifold gauge set, refrigerant (R134a).
Sub-steps:
1. Connect the low-pressure gauge to the low-pressure service port.
2. Read the pressure; if low, proceed to recharge.
3. Attach the refrigerant canister to the manifold set.
4. Start the engine and turn the AC to maximum.
5. Open the valve on the canister and allow refrigerant to flow until the pressure is within the manufacturer’s specifications (typically around 30-40 psi).

3. Inspect and Replace AC Compressor

Tools Required: Socket set, torque wrench, AC compressor oil (if replacing).
Sub-steps:
1. Remove the drive belt from the AC compressor.
2. Disconnect the electrical connector from the AC compressor.
3. Remove the refrigerant lines from the compressor (ensure refrigerant is recovered properly).
4. Unbolt the compressor from its mount and remove it.
5. Install the new compressor, following the manufacturer’s torque specifications for bolts.
6. Reconnect the refrigerant lines and electrical connector.

4. Replace AC Expansion Valve

Tools Required: Socket set, screwdriver set.
Sub-steps:
1. Locate the expansion valve near the evaporator.
2. Remove any panels obstructing access.
3. Disconnect the refrigerant lines from the valve.
4. Unbolt the expansion valve and remove it.
5. Install the new expansion valve, ensuring proper sealing and alignment.

5. Finalize and Test

Tools Required: OBD-II scanner.
Sub-steps:
1. Reconnect the battery.
2. Start the engine and turn the AC to maximum.
3. Monitor the AC performance and check for cold air flow.
4. Use the OBD-II scanner to check for any remaining trouble codes.