how to fix the AC not blowing cold air in Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

600 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold air in a 2014-2019 Toyota Highlander. 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.
•Always wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC system operates but blows warm air
•Unusual noises from the AC compressor
•AC compressor not engaging
•Visible refrigerant leaks around AC components
•Poor airflow from the vents

Diagnostic Steps

1
Check the AC settings to ensure it is set to the coldest temperature and on the correct mode.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor visually for damage or signs of leaks.
4
Check the refrigerant level using a refrigerant gauge set.
5
Test the AC fuse and relay for continuity.
6
Inspect the cabin air filter for clogs or restrictions.

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
•Refrigerant gauge set
•R-134a refrigerant
•Safety goggles
•Gloves
•Socket set
•Torque wrench
•Refrigerant recovery machine

Parts Required

•AC compressor (if replacement is necessary)
•O-rings for refrigerant lines
•Cabin air filter

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 settings to ensure it is set to the coldest temperature and on the correct mode.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Inspect the AC compressor visually for damage or signs of leaks.
4
Check the refrigerant level using a refrigerant gauge set.
5
Test the AC fuse and relay for continuity.
6
Inspect the cabin air filter for clogs or restrictions.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface and the engine is off.
Gather necessary tools and parts.
Disconnect the vehicle's battery to prevent electrical shock.

2. Recharge Refrigerant

Tools Required: Refrigerant gauge set, R-134a refrigerant, safety goggles, gloves.
Steps:
1. Connect the low-pressure side of the refrigerant gauge to the AC service port.
2. Start the engine and turn the AC to the maximum setting.
3. Check the pressure readings on the gauge; if low, proceed to recharge.
4. Attach the refrigerant canister to the gauge and open the valve to add refrigerant until the pressure is within the manufacturer's specifications (typically 25-45 psi for R-134a).
5. Disconnect the gauge and replace the service port cap.

3. Replace AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, AC compressor replacement kit, refrigerant recovery machine.
Steps:
1. Recover refrigerant using a refrigerant recovery machine.
2. Disconnect the battery again for safety.
3. Remove the serpentine belt from the AC compressor.
4. Disconnect electrical connectors and refrigerant lines from the AC compressor.
5. Unbolt the AC compressor from the mounting bracket.
6. Install the new AC compressor, ensuring to replace any O-rings and use new refrigerant oil as specified.
7. Reconnect refrigerant lines and electrical connectors.
8. Reinstall the serpentine belt, ensuring proper alignment.

4. Check and Replace Cabin Air Filter (if clogged)

Tools Required: None required.
Steps:
1. Locate the cabin air filter access panel, usually behind the glove compartment.
2. Remove the access panel by unclipping or unscrewing it.
3. Take out the old cabin air filter and inspect for dirt or blockages.
4. Install a new cabin air filter, ensuring it is oriented correctly.
5. Reattach the access panel.