Toyota Corolla E170 (2013-2019) AC not blowing cold air how to fix it

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

468 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 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 the electrical components.
•Use proper PPE (gloves and goggles) when handling refrigerants.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Unusual noises from the AC system (e.g., hissing or clicking)
•AC system cycling on and off frequently
•Poor airflow from vents

Diagnostic Steps

1
Check the AC system for any visible leaks, particularly around hoses and connections.
2
Use an OBD-II scanner to check for any fault codes related to the HVAC system.
3
Verify the AC compressor operation by listening for engagement when the AC is turned on.
4
Check the refrigerant level using a manifold gauge set.
5
Inspect the AC relay and fuses for continuity and proper operation.
6
Measure the temperature of the air coming from the vents to determine if it is within expected ranges.

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
•Refrigerant recovery machine
•Socket set
•Torque wrench
•Screwdrivers

Parts Required

•Refrigerant (R-134a)
•AC compressor (if needed)
•AC relay or fuses (if needed)

Related Faults

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Diagnostic Steps

1
Check the AC system for any visible leaks, particularly around hoses and connections.
2
Use an OBD-II scanner to check for any fault codes related to the HVAC system.
3
Verify the AC compressor operation by listening for engagement when the AC is turned on.
4
Check the refrigerant level using a manifold gauge set.
5
Inspect the AC relay and fuses for continuity and proper operation.
6
Measure the temperature of the air coming from the vents to determine if it is within expected ranges.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to ensure safety.

2. Check and Recharge Refrigerant

Sub-steps:
1. Connect the manifold gauge set to the AC service ports.
2. Check the pressure readings against manufacturer's specifications.
3. If refrigerant is low, use a refrigerant recovery machine to recover any remaining refrigerant.
4. Recharge the system with the correct type and amount of refrigerant (typically R-134a).
5. Monitor pressures to ensure they stabilize within the recommended range.

3. Inspect and Replace AC Compressor

Sub-steps:
1. Remove the drive belt from the AC compressor.
2. Disconnect electrical connectors from the compressor.
3. Remove the mounting bolts and carefully take out the compressor.
4. Install the new compressor, ensuring all seals are replaced and properly lubricated.
5. Reconnect electrical connectors and reattach the drive belt.

4. Replace AC Relay or Fuses (if necessary)

Sub-steps:
1. Locate the AC relay and fuses in the fuse box.
2. Remove the faulty relay or fuse and replace it with a new one of the same rating.
3. Double-check all connections and ensure proper seating of the relay and fuses.

5. Final Assembly and Testing

Sub-steps:
1. Reconnect the battery.
2. Start the engine and turn on the AC to check for proper operation.
3. Monitor the system for changes and listen for any unusual sounds.

Tools Required:

OBD-II scanner
Manifold gauge set
Refrigerant recovery machine
Socket set
Torque wrench
Screwdrivers

Parts Required:

Refrigerant (R-134a)
AC compressor (if needed)
AC relay or fuses (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on the electrical components.
Use proper PPE (gloves and goggles) when handling refrigerants.