how to address the AC not blowing cold air in my 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

565 words

Problem Statement

Learn how to diagnose and fix AC not blowing cold 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 systems.
•Allow the engine and AC components to cool before servicing.

Symptoms

•AC compressor not engaging
•Warm air blowing from AC vents
•Unusual noises from the AC system (e.g., clicking or hissing sounds)
•AC system cycling on and off frequently
•Poor airflow from the AC vents

Diagnostic Steps

1
Inspect the AC fuse and relay for any faults.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Check the refrigerant level using a manifold gauge set.
4
Inspect the AC compressor for signs of damage or wear.
5
Test the AC temperature blend door operation.
6
Examine the cabin air filter for restriction and replace if necessary.

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
•Fuse puller
•Socket set
•Multimeter

Parts Required

•AC fuse (if blown)
•AC refrigerant (R-1234yf)
•AC compressor (if faulty)
•Cabin air filter

Related Faults

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Diagnostic Steps

1
Inspect the AC fuse and relay for any faults.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Check the refrigerant level using a manifold gauge set.
4
Inspect the AC compressor for signs of damage or wear.
5
Test the AC temperature blend door operation.
6
Examine the cabin air filter for restriction and replace if necessary.

Solution

1. Preparation

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

2. Inspect and Replace AC Fuse/Relay

Tools Required: Fuse puller or pliers
Locate the fuse box under the dashboard or hood.
Remove the AC fuse using a fuse puller.
Inspect for continuity; replace if blown.
Check the AC relay in the fuse box; replace if faulty.

3. Recharge AC System

Tools Required: Manifold gauge set, refrigerant (R-1234yf for 2014-2019 Highlander)
Connect the manifold gauges to the high and low-pressure service ports.
Start the engine and turn the AC to maximum cooling.
Check the refrigerant pressure; if low, evacuate the system and recharge it with the appropriate amount of refrigerant per manufacturer specifications.

4. Inspect AC Compressor

Tools Required: Socket set, torque wrench
Locate the AC compressor and visually check for leaks or damage.
Using a multimeter, test the compressor clutch for electrical continuity.
If faulty, replace the compressor following the manufacturer's service manual for specific torque values and procedures.

5. Check and Replace Cabin Air Filter

Tools Required: None required
Open the glove compartment and locate the cabin air filter access panel.
Remove the panel and take out the old cabin air filter.
Install a new cabin air filter, ensuring it is positioned correctly.