why is my Toyota Corolla E170 (2013-2019) AC blowing warm air

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

565 words

Problem Statement

Complete guide to fixing AC that blows warm air in Toyota Corolla E170 (2013-2019). Includes symptoms, diagnostic steps, tools required, and repair procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Ensure the AC system is properly evacuated and refrigerant is handled according to local regulations.

Symptoms

•AC system blowing warm air
•Unusual noise coming from the AC compressor
•AC clutch not engaging
•Odor coming from the vents
•Decreased airflow from the vents
•Check engine light illuminated

Diagnostic Steps

1
Check the AC system fuse for continuity using a multimeter.
2
Inspect the refrigerant level using a manifold gauge set.
3
Listen for the AC compressor engagement when the AC is turned on.
4
Examine the AC compressor and associated belts for wear and damage.
5
Look for any visible leaks in the AC system, especially around hoses and connections.
6
Scan the vehicle’s computer for any error codes related to the AC system.

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
•Refrigerant canister
•UV leak detection kit
•Basic socket set

Parts Required

•AC fuse (if blown)
•Refrigerant (R-134a)
•AC compressor (if faulty)

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Diagnostic Steps

1
Check the AC system fuse for continuity using a multimeter.
2
Inspect the refrigerant level using a manifold gauge set.
3
Listen for the AC compressor engagement when the AC is turned on.
4
Examine the AC compressor and associated belts for wear and damage.
5
Look for any visible leaks in the AC system, especially around hoses and connections.
6
Scan the vehicle’s computer for any error codes related to the AC system.

Solution

1. Preparation

Gather tools and parts needed.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the battery to avoid electrical shorts during repairs.

2. Inspect and Replace AC Fuse

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

3. Check and Recharge Refrigerant

Connect the manifold gauge set to the low and high-pressure ports of the AC system.
Read the pressure levels; if they are below the manufacturer's specifications, proceed to recharge.
Use a refrigerant canister with the appropriate type of refrigerant (usually R-134a for this model).
Follow the instructions on the refrigerant canister to recharge the system, ensuring not to overfill.

4. Inspect and Replace AC Compressor (if necessary)

If the compressor is not engaging, inspect the electrical connections and the AC relay.
If the compressor is damaged or not functioning, disconnect the electrical connectors and remove any bolts securing it.
Install the new compressor by reversing the removal process; torque bolts to manufacturer specifications.

5. Leak Detection

Use a UV leak detection kit to identify any leaks in the system.
If leaks are found, replace the affected hoses or seals.
Recharge the system again if any components were replaced.