my Toyota Corolla E170 (2013-2019) AC is not blowing cold air what should I check

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

584 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 electrical components.
•Allow the engine to cool before working on the AC system.

Symptoms

•No cold air output from the AC vents
•AC compressor not engaging
•Unusual noises when the AC is turned on
•Foul odor coming from the vents
•AC system blowing warm air
•Reduced airflow from the AC vents

Diagnostic Steps

1
Inspect the AC compressor for signs of damage or failure.
2
Check the refrigerant level using a manifold gauge set.
3
Examine the AC fuse and relay for continuity.
4
Scan the vehicle's OBD-II system for any error codes related to the AC system.
5
Inspect the cabin air filter for clogs or blockages.
6
Check for visible leaks in the AC system components (hoses, condenser, evaporator).

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
•Socket set
•Screwdriver

Parts Required

•Cabin air filter
•Refrigerant (R-134a)
•AC compressor (if applicable)

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Diagnostic Steps

1
Inspect the AC compressor for signs of damage or failure.
2
Check the refrigerant level using a manifold gauge set.
3
Examine the AC fuse and relay for continuity.
4
Scan the vehicle's OBD-II system for any error codes related to the AC system.
5
Inspect the cabin air filter for clogs or blockages.
6
Check for visible leaks in the AC system components (hoses, condenser, evaporator).

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface with the engine off for safety.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace the Cabin Air Filter

Tools Required: Screwdriver, new cabin air filter
Locate the cabin air filter housing, typically under the dashboard on the passenger side.
Remove the cover by unscrewing or unclipping it.
Take out the old filter and inspect it for dirt and debris.
Install the new cabin air filter in the correct orientation.
Reattach the cover and secure it.

3. Check and Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant (R-134a)
Connect the manifold gauge set to the low and high-pressure service ports on the AC system.
Start the engine and turn on the AC to the maximum setting.
Read the pressure readings on the gauge; if low, proceed to recharge.
Add refrigerant slowly until the correct pressure is achieved, maintaining the appropriate levels as per manufacturer specifications.

4. Repair or Replace AC Compressor

Tools Required: Socket set, AC compressor replacement kit (if necessary)
If the compressor is not engaging, check the electrical connections and the clutch for wear.
If faulty, disconnect the AC compressor from the system.
Remove the compressor mounting bolts and carefully take out the unit.
Install the new compressor, ensuring all connections are secure.
Refill the system with the correct amount of oil if required.

5. Test Functionality

Reconnect the negative battery terminal.
Start the vehicle and test the AC system for cold air output.
Monitor for any unusual noises or leaks.