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

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

535 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 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 the electrical components.
•Wear safety glasses and gloves when handling refrigerants and AC components.

Symptoms

•AC compressor does not engage
•Warm air blowing from vents
•Unusual noises from the AC unit
•AC system cycling on and off frequently
•Ice buildup on the AC evaporator or compressor

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC system-related faults.
2
Inspect the AC fuse and relay to ensure they are functioning properly.
3
Check the refrigerant level using a manifold gauge set to verify if it's low or empty.
4
Inspect the AC compressor belt for any signs of wear or damage.
5
Test the AC compressor clutch for proper engagement with a multimeter.
6
Examine the AC condenser for any obstructions or damage.

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
•Multimeter
•Socket set
•Refrigerant canister (R134a)

Parts Required

•AC fuse (if faulty)
•AC relay (if faulty)
•Refrigerant (R134a)
•AC compressor clutch (if defective)
•AC condenser (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC system-related faults.
2
Inspect the AC fuse and relay to ensure they are functioning properly.
3
Check the refrigerant level using a manifold gauge set to verify if it's low or empty.
4
Inspect the AC compressor belt for any signs of wear or damage.
5
Test the AC compressor clutch for proper engagement with a multimeter.
6
Examine the AC condenser for any obstructions or damage.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the vehicle's battery to ensure safety while working on the AC system.
Ensure the engine is cool before starting work.

2. Check and Replace AC Fuse/Relay

Locate the fuse box and identify the AC fuse.
Use a test light to confirm the fuse is operational; replace if faulty.
Check the AC relay and replace it if it does not click when power is applied.

3. Recharge Refrigerant

Connect a manifold gauge set to the low and high-pressure service ports of the AC system.
If refrigerant is low, use a refrigerant canister to recharge the system, following the manufacturer's specifications for the type and amount of refrigerant.
Monitor gauge readings and ensure they fall within the normal operating range.

4. Inspect and Replace AC Compressor Clutch

Remove the AC compressor belt using a socket set.
Test the AC compressor clutch for continuity with a multimeter; replace if defective.
Install the new clutch by following the manufacturer's installation instructions and torque specifications.

5. Clean or Replace AC Condenser

Inspect the AC condenser for debris or blockages; clean with compressed air or a soft brush.
If the condenser is damaged, remove it by disconnecting the refrigerant lines and mounting bolts. Install a new condenser by following the reverse order.