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

563 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, tools, 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 components.
•Wear safety glasses and gloves when handling refrigerants.

Symptoms

•AC blows warm air instead of cold
•Unusual noises from the AC compressor
•AC compressor not engaging
•Foul smell from AC vents
•Decreased airflow from vents
•Dashboard warning lights related to the AC system illuminated

Diagnostic Steps

1
Check the refrigerant level using a manifold gauge set.
2
Inspect the AC compressor for signs of damage or failure.
3
Listen for unusual noises when the AC is activated.
4
Examine the AC relay and fuses for continuity.
5
Test the AC pressure switch for proper operation.
6
Inspect the cabin air filter for clogs or blockages.

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
•Screwdriver set

Parts Required

•Refrigerant
•AC compressor (if faulty)
•Cabin air filter

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Diagnostic Steps

1
Check the refrigerant level using a manifold gauge set.
2
Inspect the AC compressor for signs of damage or failure.
3
Listen for unusual noises when the AC is activated.
4
Examine the AC relay and fuses for continuity.
5
Test the AC pressure switch for proper operation.
6
Inspect the cabin air filter for clogs or blockages.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to ensure safety.

Tools Required:

Manifold gauge set
Multimeter
Socket set
Screwdriver set
Refrigerant (if needed)

2. Check and Recharge Refrigerant

Step 1: Connect the manifold gauge set to the low and high-pressure service ports of the AC system.
Step 2: Start the engine and turn the AC to the maximum setting.
Step 3: Read the pressure levels on the gauges. If low, proceed to recharge.
Step 4: If necessary, add refrigerant according to manufacturer specifications until the correct pressure is achieved.

3. Inspect and Replace AC Compressor (if needed)

Step 1: Locate the AC compressor and visually inspect for leaks or damage.
Step 2: If the compressor is faulty, disconnect the electrical connector and remove the mounting bolts.
Step 3: Carefully remove the old compressor and install the new unit, ensuring proper alignment.
Step 4: Reconnect the electrical connector and secure all bolts to the manufacturer’s torque specifications.

4. Check AC Relay and Fuses

Step 1: Locate the fuse box and identify the AC relay and associated fuses.
Step 2: Use a multimeter to check for continuity in the relay and replace if necessary.
Step 3: Inspect and replace any blown fuses related to the AC system.

5. Replace Cabin Air Filter

Step 1: Locate the cabin air filter, typically behind the glove box.
Step 2: Remove the glove box and access the filter housing.
Step 3: Remove the old filter and install a new one, ensuring it is properly seated.