how to fix my Toyota Highlander XU70 (2020-Present) AC not working at all

Toyota Highlander XU70 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

675 words

Problem Statement

Learn how to diagnose and fix AC issues in Toyota Highlander XU70 (2020-present). 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 to cool before working on the AC system to avoid burns.

Symptoms

•AC system does not blow cold air
•AC compressor not engaging
•Strange noises when AC is activated
•Foul odor when AC is turned on
•AC control lights not illuminating

Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'AC' and the temperature is set to a low setting.
2
Inspect the AC fuse in the fuse box for any blown fuses.
3
Scan the vehicle's onboard computer for any error codes related to the AC system using an OBD-II scanner.
4
Visually inspect the AC compressor for signs of damage or leaks.
5
Check the refrigerant level using a manifold gauge set to determine if it is low.
6
Inspect the cabin air filter to ensure it is not clogged, restricting airflow.

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
•Socket set
•Manifold gauge set
•Refrigerant recharge kit
•Safety glasses
•Gloves

Parts Required

•AC fuse (if blown)
•Refrigerant (R-134a or specified type)
•Cabin air filter
•AC compressor (if damaged)

Related Faults

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Diagnostic Steps

1
Check the AC control settings to ensure the system is set to 'AC' and the temperature is set to a low setting.
2
Inspect the AC fuse in the fuse box for any blown fuses.
3
Scan the vehicle's onboard computer for any error codes related to the AC system using an OBD-II scanner.
4
Visually inspect the AC compressor for signs of damage or leaks.
5
Check the refrigerant level using a manifold gauge set to determine if it is low.
6
Inspect the cabin air filter to ensure it is not clogged, restricting airflow.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, manifold gauge set, refrigerant recharge kit, safety glasses, gloves.
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Replace Blown Fuse

Locate the fuse box (usually under the dashboard or in the engine compartment).
Remove the cover and identify the AC fuse using the diagram on the fuse box cover.
Use a fuse puller or needle-nose pliers to carefully remove the blown fuse.
Replace it with a new fuse of the same amperage.

3. Recharge Refrigerant

Connect the manifold gauge set to the AC service ports (high and low sides).
Start the engine and turn on the AC to the maximum setting.
Check the pressure readings on the gauges; if low, proceed to recharge.
Attach the refrigerant can to the low-pressure side and follow the instructions on the refrigerant can to recharge to the correct level.
Disconnect the pressure gauges and ensure all connections are secure.

4. Replace Cabin Air Filter

Open the glove compartment and remove any contents.
Locate the access panel for the cabin air filter (usually behind the glove compartment).
Remove the panel and take out the old cabin air filter.
Install a new cabin air filter, ensuring it is oriented correctly according to the airflow direction marked on the filter.
Reinstall the access panel and close the glove compartment.

5. Inspect and Replace AC Compressor (if necessary)

If the compressor is damaged or not engaging, it may need to be replaced.
Disconnect the electrical connector from the compressor.
Remove the compressor mounting bolts using a socket set.
Disconnect the refrigerant lines (be cautious of refrigerant leaks).
Install the new compressor by reversing the removal steps, ensuring to add new refrigerant oil as specified in the service manual.
Reconnect the electrical connector and refrigerant lines.