how to fix my Toyota Corolla E170 (2013-2019) AC that’s not blowing cold air?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

531 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold air in a 2013-2019 Toyota Corolla E170. 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 on any components.

Symptoms

•AC compressor does not engage
•Warm air blowing from vents
•Unusual noises from the AC system (e.g., hissing or clicking)
•AC light on the dashboard not illuminated
•Moisture or refrigerant leaks under the vehicle

Diagnostic Steps

1
Check the AC system for refrigerant levels using a manifold gauge set.
2
Inspect the AC compressor for visible damage or signs of failure.
3
Scan the vehicle's OBD-II system for any error codes related to the AC system.
4
Verify that the AC fuse is intact and not blown.
5
Check the cabin air filter for blockages or dirt that may restrict airflow.

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
•AC recharge kit
•Socket set
•Screwdrivers
•Torque wrench

Parts Required

•Refrigerant (R-134a for most models)
•AC compressor (if found faulty)
•AC relay (if found faulty)
•Cabin air filter (if dirty)

Related Faults

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Diagnostic Steps

1
Check the AC system for refrigerant levels using a manifold gauge set.
2
Inspect the AC compressor for visible damage or signs of failure.
3
Scan the vehicle's OBD-II system for any error codes related to the AC system.
4
Verify that the AC fuse is intact and not blown.
5
Check the cabin air filter for blockages or dirt that may restrict airflow.

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 ensure safety while working on electrical components.

2. Recharging the AC System

Tools Required: Manifold gauge set, refrigerant canister, AC recharge kit.
Connect the manifold gauge set to the AC service ports (low and high side).
Start the engine and set the AC to maximum cold and fan speed.
Check the low-pressure side reading; if it is low, proceed to recharge the system.
Attach the refrigerant canister to the low-side port and slowly add refrigerant while monitoring pressures until they reach the manufacturer's specifications.

3. Inspecting and Replacing Components

Tools Required: Socket set, screwdrivers, torque wrench.
If the compressor is not engaging, check the electrical connections and the AC relay. Replace any faulty components.
If compressor damage is detected, remove the old compressor:
- Disconnect the refrigerant lines and electrical connectors.
- Unbolt the compressor from its mounting.
- Install the new compressor in reverse order, ensuring all connections are secure.
- Torque the bolts to the manufacturer's specifications.

4. Testing and Finalizing

After recharging or replacing components, start the engine and turn on the AC.
Monitor the system for proper operation and listen for unusual noises.
Check for any refrigerant leaks with a UV dye or electronic leak detector.