2018 Lexus IS350 AC Isn't Working

Common Causes of AC Malfunctions in Your 2018 Lexus IS350 and How to Restore Comfort

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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 2018 Lexus IS350 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 initial steps to diagnose the AC issue in a 2018 Lexus IS350?

When diagnosing an AC issue in a 2018 Lexus IS350, start by checking the air filters, as clean filters are crucial for optimal airflow and cooling performance. Next, inspect the refrigerant levels; low refrigerant can significantly hinder the AC's ability to cool the cabin. Following this, examine the AC compressor for any visible damage or leaks, as these can directly affect its operation. Additionally, testing the thermostat is important to ensure it is accurately regulating the vehicle's temperature. Finally, conduct a thorough inspection of the entire AC system for any leaks, as these can lead to refrigerant loss and diminished cooling efficiency. By systematically addressing these areas, you can effectively diagnose and potentially resolve the AC issues in your Lexus IS350.

What are the common problems that could cause the AC to stop working in a 2018 Lexus IS350?

When troubleshooting the air conditioning system in a 2018 Lexus IS350, it's essential to recognize the common problems that may lead to a malfunction. One of the primary issues could be low refrigerant levels, which can significantly hinder the system's ability to cool effectively. If the refrigerant is low, it may indicate a leak that needs to be addressed. Another potential culprit is a faulty compressor; if the compressor is not functioning properly, it will fail to circulate the refrigerant, resulting in inadequate cooling. Additionally, electrical issues such as blown fuses or damaged wiring can disrupt the AC's operation, preventing it from working altogether. A clogged or leaking condenser can also impede the cooling process, as it plays a vital role in dissipating heat from the refrigerant. Lastly, a malfunctioning blower motor can lead to insufficient airflow from the vents, further compromising the system's cooling efficiency. Identifying these issues early on can help in effectively restoring the AC system's functionality, but for complex repairs, consulting a qualified technician is recommended.

How urgent is it to address the AC failure in my 2018 Lexus IS350?

When faced with an AC failure in your 2018 Lexus IS350, it is essential to recognize the urgency of the situation. A malfunctioning AC system not only compromises your comfort during hot weather but can also distract you from driving, potentially leading to safety hazards. The discomfort caused by high temperatures can impair your focus on the road, making it vital to resolve the issue promptly. Additionally, neglecting AC problems can escalate into more severe and costly repairs, as minor issues can develop into significant system failures over time. By addressing the AC failure early, you not only safeguard your vehicle's performance but also maintain its resale value. A well-maintained AC system reflects positively on your vehicle's overall condition, making it more appealing to future buyers. Therefore, while it may not seem like an immediate emergency, taking swift action to repair your AC is crucial for your comfort, safety, and the longevity of your vehicle.

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2018 Lexus IS350 AC Not Working: Common Issues & Repairs