why is my Toyota Corolla E170 (2013-2019) air conditioning not blowing cold air?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

537 words

Problem Statement

Learn how to diagnose and fix the air conditioning not blowing cold air in a 2013-2019 Toyota Corolla E170. 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.
•Always recover refrigerant properly to avoid environmental harm.

Symptoms

•A/C compressor not engaging
•Warm air blowing from vents
•A/C warning light illuminated on the dashboard
•Unusual noises when A/C is activated
•Reduced airflow from vents

Diagnostic Steps

1
Check for A/C refrigerant levels using a manifold gauge set.
2
Scan the vehicle’s computer for any error codes related to the A/C system.
3
Inspect the A/C compressor visually for signs of damage or leaks.
4
Test the A/C relay and fuses for continuity.
5
Verify the operation of the A/C control switch and climate control module.
6
Inspect the cabin air filter for clogs or obstructions.

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

•Manifold gauge set
•Multimeter
•Socket set
•Torque wrench
•A/C compressor removal tool

Parts Required

•R-134a refrigerant
•A/C compressor (if needed)
•A/C relay (if needed)
•Cabin air filter (if needed)

Related Faults

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Diagnostic Steps

1
Check for A/C refrigerant levels using a manifold gauge set.
2
Scan the vehicle’s computer for any error codes related to the A/C system.
3
Inspect the A/C compressor visually for signs of damage or leaks.
4
Test the A/C relay and fuses for continuity.
5
Verify the operation of the A/C control switch and climate control module.
6
Inspect the cabin air filter for clogs or obstructions.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Wear safety goggles and gloves for protection.

2. Recharge A/C System

Tools Required: Manifold gauge set, refrigerant (R-134a), A/C refrigerant oil (if needed).
Sub-steps:
1. Connect the low-pressure side of the manifold gauge to the A/C service port.
2. Open the low-pressure valve on the manifold gauge.
3. Allow refrigerant to enter the system until the pressure reaches the manufacturer's specifications (typically 30-40 PSI).
4. If refrigerant oil is required, add according to manufacturer specifications.

3. Replace A/C Compressor (if necessary)

Tools Required: Socket set, torque wrench, A/C compressor removal tool.
Sub-steps:
1. Disconnect the negative battery terminal.
2. Remove the drive belt by loosening the tensioner pulley.
3. Disconnect electrical connectors from the A/C compressor.
4. Remove the refrigerant lines from the compressor (ensure proper recovery of refrigerant).
5. Unbolt the compressor from its mounting bracket and remove it from the vehicle.
6. Install the new A/C compressor, tightening bolts to manufacturer torque specifications.
7. Reconnect refrigerant lines and electrical connectors.

4. Check and Replace A/C Relay (if necessary)

Tools Required: Multimeter.
Sub-steps:
1. Locate the A/C relay in the fuse box (refer to the owner’s manual for exact location).
2. Use a multimeter to test the relay for continuity.
3. Replace with a new relay if it is faulty.