Toyota Highlander Third Generation (2014-2019) AC not blowing air what could be the issue

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

458 words

Problem Statement

Learn how to diagnose and fix AC not blowing air in Toyota Highlander (2014-2019). 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 inspecting the AC system to prevent burns.

Symptoms

•No airflow from the AC vents
•AC control panel lights may not function
•Strange noises when the AC is turned on
•Poor or no cold air when the AC is operating
•Incorrect temperature readings on the AC display

Diagnostic Steps

1
Check the AC control panel for any error messages or malfunctioning lights.
2
Inspect the cabin air filter for clogs or blockages.
3
Verify the AC compressor is engaging by listening for a click sound.
4
Use an OBD-II scanner to check for any related error codes.
5
Inspect the blower motor fuse and relay for continuity.
6
Measure voltage at the blower motor connector with a multimeter.

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
•Multimeter
•Socket set
•Screwdriver set

Parts Required

•Cabin air filter
•Blower motor (if faulty)
•AC relay (if faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the AC control panel for any error messages or malfunctioning lights.
2
Inspect the cabin air filter for clogs or blockages.
3
Verify the AC compressor is engaging by listening for a click sound.
4
Use an OBD-II scanner to check for any related error codes.
5
Inspect the blower motor fuse and relay for continuity.
6
Measure voltage at the blower motor connector with a multimeter.

Solution

1. Preparation

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

2. Check and Replace Cabin Air Filter

Locate the cabin air filter compartment, usually behind the glove box.
Remove the glove box by unscrewing it or unclipping it as necessary.
Take out the old cabin air filter and inspect for dirt or blockage.
Insert the new cabin air filter, ensuring it is oriented correctly.

3. Inspect and Replace Blower Motor

Remove any necessary trim pieces to access the blower motor.
Disconnect the electrical connector from the blower motor.
Remove the blower motor retaining screws and take out the motor.
Install the new blower motor by reversing the removal steps and torque screws to the manufacturer’s specifications.

4. Verify AC Compressor Functionality

Reconnect the battery terminal.
Turn on the AC and check if the compressor engages.
If it does not engage, check the AC relay and replace it if faulty.