why is my Toyota Corolla E170 (2013-2019) AC not blowing cold air anymore

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

553 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 electrical systems.
•Wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC system blowing warm air
•AC compressor not engaging
•Unusual noises from the AC system
•Condensation around the AC vents
•Check engine light illuminated (if applicable)

Diagnostic Steps

1
Check the AC settings and ensure the temperature is set to the coldest setting.
2
Inspect the AC system fuse and replace if blown.
3
Use an OBD-II scanner to check for any stored error codes related to the AC system.
4
Inspect the refrigerant levels using a manifold gauge set.
5
Examine the AC compressor for signs of damage or wear.
6
Check for leaks in the AC system using a UV dye or electronic leak detector.

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
•Fuse puller
•Basic socket set
•UV dye or electronic leak detector

Parts Required

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

Related Faults

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Diagnostic Steps

1
Check the AC settings and ensure the temperature is set to the coldest setting.
2
Inspect the AC system fuse and replace if blown.
3
Use an OBD-II scanner to check for any stored error codes related to the AC system.
4
Inspect the refrigerant levels using a manifold gauge set.
5
Examine the AC compressor for signs of damage or wear.
6
Check for leaks in the AC system using a UV dye or electronic leak detector.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface, and the engine is turned off.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace AC Fuse

Locate the fuse box (usually under the dashboard or in the engine compartment).
Remove the AC fuse using a fuse puller.
Inspect the fuse for continuity. If blown, replace it with a fuse of the same amperage.

3. Recharge Refrigerant

Connect a manifold gauge set to the low and high-pressure service ports on the AC system.
Check refrigerant levels; if low, add refrigerant according to the manufacturer's specifications (typically R-134a for this model).
Monitor the pressure readings to ensure they fall within the recommended range (approximately 30-40 psi on the low side and 200-250 psi on the high side).

4. Inspect and Replace AC Compressor (if necessary)

If the compressor is not engaging, check the electrical connections and relay.
If the compressor is faulty, disconnect the AC lines and electrical connector.
Remove the compressor from its mounting brackets.
Install the new compressor and reconnect the lines and electrical connector.
Ensure all connections are tight and leak-free.

5. Leak Test

After recharging the system, use a UV dye or electronic leak detector to check for leaks.
If leaks are detected, repair or replace the faulty components.