Toyota Highlander Third Generation (2014-2019) air conditioning not blowing cold air, what to check?

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

555 words

Problem Statement

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

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Handle refrigerants with care and follow all safety guidelines.

Symptoms

•No cold air blowing from the vents
•Weak airflow from the AC system
•AC compressor not engaging
•Unusual noises from the AC system when activated
•Increased humidity inside the cabin
•Potential odor from the vents when AC is turned on

Diagnostic Steps

1
Check the AC system's refrigerant levels using a pressure gauge.
2
Inspect the AC compressor for proper engagement and any visible leaks.
3
Examine the AC fuses and relays for continuity and proper function.
4
Test the climate control settings and controls for functionality.
5
Inspect the cabin air filter for blockages or dirt.
6
Check for any fault codes using an OBD-II scanner related to the AC system.

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

•Refrigerant gauge set
•Refrigerant canister
•Multimeter
•Screwdriver set

Parts Required

•Cabin air filter
•AC refrigerant (if low)
•AC compressor (if faulty)

Related Faults

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Diagnostic Steps

1
Check the AC system's refrigerant levels using a pressure gauge.
2
Inspect the AC compressor for proper engagement and any visible leaks.
3
Examine the AC fuses and relays for continuity and proper function.
4
Test the climate control settings and controls for functionality.
5
Inspect the cabin air filter for blockages or dirt.
6
Check for any fault codes using an OBD-II scanner related to the AC system.

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 avoid any electrical issues during repairs.

2. Check and Recharge Refrigerant

Tools Required: Refrigerant gauge set, refrigerant canister.
Sub-steps:
1. Connect the refrigerant gauge set to the AC service ports.
2. Check the low and high-pressure readings; compare them with manufacturer specifications.
3. If the refrigerant is low, follow the refrigerant canister instructions to recharge the system.
4. Monitor the system for any leaks by observing the pressure levels post-recharge.

3. Inspect and Replace Cabin Air Filter

Tools Required: Screwdriver, new cabin air filter.
Sub-steps:
1. Locate the cabin air filter housing, usually behind the glove compartment.
2. Remove the screws or clips securing the housing cover.
3. Take out the old cabin air filter and inspect for dirt and blockages.
4. Install the new cabin air filter, ensuring it is oriented correctly.
5. Reattach the housing cover and secure it with screws or clips.

4. Test AC Compressor and Electrical Components

Tools Required: Multimeter.
Sub-steps:
1. Locate the AC compressor and check for any visible signs of damage or leaks.
2. Use a multimeter to test the electrical connector for voltage while the AC is turned on.
3. If there is no voltage, check the AC relay and replace if necessary.
4. Ensure that the compressor clutch engages when the system is activated; replace the compressor if it does not.