2009 Lexus GS350 AC Isn't Working

Common Causes of AC Failure in Your 2009 Lexus GS350 and How to Restore Comfort in Your Vehicle

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
37% chance it's the
Refrigerant Leak
0%
21% chance it's the
Climate Control Electrical Issue
0%
12% chance it's the
AC Compressor
0%
30% chance it's
Something else
The most common reasons a 2009 Lexus GS350 AC isn't working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.
  • Refrigerant Leak: A refrigerant leak can occur due to damaged hoses, seals, or connections, resulting in decreased cooling efficiency in the air conditioning system.
  • Climate Control Electrical Issue: A faulty climate control module or a blown fuse could be causing the electrical issues in the climate control system.
  • AC Compressor: A faulty AC compressor may be due to a lack of lubrication, electrical issues, or internal mechanical failure, resulting in inadequate cooling performance.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the best Lexus repair shops?

RepairPal Certified shops can diagnose and repair your 2009 Lexus GS350 climate control issues. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
30 Certified Locations
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Tuffy Tire & Auto Service Center - Grandview

4.7
(85)
2.39 mi
1524 W 5th Ave
Columbus, OH
Open
Closes 5:00 PM
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Excite Auto Repair & Towing

4.4
(15)
5.94 mi
3430 Westerville Road
Columbus, OH
Open
Closes 6:00 PM
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All In Auto Service

4.9
(25)
6.56 mi
5200 Fisher Road
Columbus, OH
Open
Closes 6:00 PM
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Tuffy Tire & Auto Service - Grove City

4.4
(520)
6.67 mi
2131 Stringtown Rd
Grove City, OH
Open
Closes 6:00 PM
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See All 30 Locations

What are the initial diagnostic steps to take when the AC isn't working in a 2009 Lexus GS350?

When your 2009 Lexus GS350's AC isn't functioning properly, start by checking the thermostat settings to ensure they are correctly adjusted. Sometimes, the simplest solution is just a matter of setting the desired temperature. Next, inspect the air filters; dirty or clogged filters can significantly restrict airflow, so replacing them can often restore AC performance. If the issue persists, examine the refrigerant levels using a pressure gauge, as low levels can lead to warm air blowing from the vents. Additionally, look for any visible signs of leaks in the AC system, such as oily residue around hoses or connections, which can indicate a refrigerant loss. It's also crucial to test the compressor to ensure it engages when the AC is activated; a malfunctioning compressor may require repair or replacement. Finally, check the electrical connections, including fuses and relays, as faulty wiring can prevent the AC from operating correctly. By following these diagnostic steps, you can systematically identify and address the common issues affecting your vehicle's air conditioning system.

What are the common problems that could cause the AC to stop working in a 2009 Lexus GS350?

When troubleshooting the air conditioning system in a 2009 Lexus GS350, it's essential to understand the common problems that could lead to a malfunction. One prevalent issue is refrigerant leaks, which can significantly reduce the system's ability to produce cold air. Additionally, a faulty compressor may prevent the AC from functioning correctly, resulting in warm air circulating within the cabin. Electrical issues, such as a malfunctioning relay or damaged wiring, can also disrupt the system's operation, leading to complete failure. Another factor to consider is a clogged or dirty condenser, which can obstruct airflow and diminish cooling efficiency. Furthermore, a faulty thermostat may fail to regulate the temperature accurately, causing inconsistent cooling performance. Lastly, problems with the blower motor can lead to inadequate airflow or no air at all from the vents. By identifying and addressing these issues, you can restore your Lexus GS350's AC system to optimal performance.

How urgent is it to repair the non-functioning AC in a 2009 Lexus GS350?

Repairing the non-functioning AC in a 2009 Lexus GS350 is an urgent matter that should not be overlooked. The discomfort of driving without air conditioning, especially during sweltering summer months, can significantly detract from the driving experience, making it not only unpleasant but potentially unsafe. Moreover, the health risks associated with extreme heat cannot be ignored; individuals, particularly children and the elderly, are at a higher risk of heat-related illnesses when exposed to high temperatures for extended periods. Additionally, a malfunctioning AC can negatively impact the vehicle's resale value, as prospective buyers often view a fully functional AC system as a standard expectation. Lastly, neglecting AC repairs can lead to further mechanical strain on the vehicle, potentially resulting in more severe and costly issues down the line. Therefore, addressing AC problems promptly is essential for ensuring comfort, safety, and the longevity of your vehicle.

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