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

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

604 words

Problem Statement

Learn how to troubleshoot and fix AC not blowing cold air in Toyota Highlander (2014-2019). Step-by-step guide with diagnostic and repair instructions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the negative battery terminal before working on electrical components.
•Allow the engine to cool before working on AC components to avoid burns.

Symptoms

•AC system not blowing cold air
•Strange noises coming from the AC compressor
•AC compressor clutch not engaging
•Increased humidity inside the cabin
•Foul odors emanating from the AC vents

Diagnostic Steps

1
Check the refrigerant level using a manifold gauge set.
2
Inspect the AC compressor for physical damage and ensure the clutch engages.
3
Test the AC fuses and relays in the fuse box.
4
Examine the cabin air filter for clogs or contamination.
5
Scan for any diagnostic trouble codes (DTCs) related to the AC system using an OBD-II scanner.
6
Inspect the AC system for leaks using UV dye or electronic leak detector.

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
•Refrigerant can and tap
•Screwdriver
•Socket set
•Torque wrench

Parts Required

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

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the refrigerant level using a manifold gauge set.
2
Inspect the AC compressor for physical damage and ensure the clutch engages.
3
Test the AC fuses and relays in the fuse box.
4
Examine the cabin air filter for clogs or contamination.
5
Scan for any diagnostic trouble codes (DTCs) related to the AC system using an OBD-II scanner.
6
Inspect the AC system for leaks using UV dye or electronic leak detector.

Solution

1. Preparation

Gather necessary tools and parts for the repair.
Ensure the vehicle is parked on a level surface and the ignition is off.
Wear safety glasses and gloves for protection.

2. Recharge the AC System

Tools Required: Manifold gauge set, refrigerant, AC refrigerant can tap
Connect the manifold gauge set to the AC service ports (low and high side).
Start the engine and turn the AC to the maximum setting.
Observe the pressure readings on the gauge. If low, proceed to recharge.
Follow the manufacturer's specifications for the correct type and amount of refrigerant.
Disconnect the can tap and gauges once the proper pressure is achieved.

3. Replace the Cabin Air Filter

Tools Required: Screwdriver (if applicable)
Locate the cabin air filter housing (usually behind the glove box).
Remove any screws or clips securing the glove box and lower it.
Take out the old cabin air filter and inspect for dirt or damage.
Insert a new cabin air filter, ensuring it is oriented correctly.
Reassemble the glove box and secure it in place.

4. Repair or Replace AC Compressor

Tools Required: Socket set, torque wrench, AC compressor oil, refrigerant
Disconnect the negative battery terminal to ensure safety.
Remove any components obstructing access to the AC compressor (like belts or hoses).
Disconnect the electrical connectors and refrigerant lines from the compressor.
Unbolt the compressor from its mounting bracket and remove it.
Install the new compressor, ensuring to use the appropriate torque values for the mounting bolts.
Reconnect the refrigerant lines and electrical connectors.
Add the specified amount of AC compressor oil (if applicable).