why does my Toyota Highlander Third Generation (2014-2019) AC not blowing cold air anymore

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

551 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 components.
•Allow the engine to cool before working on the AC system to avoid burns.

Symptoms

•AC compressor not engaging
•Warm air blowing from vents
•Unusual noises when AC is turned on
•AC system not cycling on and off properly
•Visible refrigerant leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC-related faults.
2
Inspect the AC compressor for signs of damage or wear.
3
Check the refrigerant level using a pressure gauge on the service ports.
4
Examine fuses and relays related to the AC system for continuity.
5
Inspect the cabin air filter for blockage or restrictions.
6
Verify the operation of the AC control module and temperature sensors.

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
•Socket set
•Wrenches
•Pulley puller

Parts Required

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

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for AC-related faults.
2
Inspect the AC compressor for signs of damage or wear.
3
Check the refrigerant level using a pressure gauge on the service ports.
4
Examine fuses and relays related to the AC system for continuity.
5
Inspect the cabin air filter for blockage or restrictions.
6
Verify the operation of the AC control module and temperature sensors.

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 shorts.

2. Check and Recharge Refrigerant

Tools Required: Refrigerant gauge set, refrigerant, safety goggles, gloves.
Sub-steps:
1. Connect the refrigerant gauge set to the low-pressure service port.
2. Read the pressure to determine if it is below the manufacturer's specifications.
3. If low, add refrigerant according to the manufacturer's specifications, ensuring not to overfill.
4. Monitor the AC system for proper operation after recharging.

3. Inspect and Replace AC Compressor

Tools Required: Socket set, wrenches, pulley puller, AC compressor oil.
Sub-steps:
1. Remove the drive belt from the AC compressor.
2. Disconnect electrical connectors and refrigerant lines from the compressor.
3. Remove mounting bolts and take out the old compressor.
4. Install the new compressor with a new O-ring and apply the recommended amount of compressor oil.
5. Reconnect refrigerant lines and electrical connectors.
6. Reinstall the drive belt and check the tension.

4. Replace Cabin Air Filter

Tools Required: None specifically required.
Sub-steps:
1. Locate the cabin air filter compartment, typically behind the glove box.
2. Open the glove box and remove any obstructing covers.
3. Remove the old cabin air filter and insert a new one, ensuring the airflow direction is correct.
4. Reassemble the glove box and covers.