2018 Chevrolet Express 2500 AC Isn't Working

Common Causes of AC Malfunctions in Your 2018 Chevrolet Express 2500 and How to Fix Them

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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 Chevrolet Express 2500 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 diagnostic steps to take when the AC isn't working in a 2018 Chevrolet Express 2500?

When faced with an AC malfunction in a 2018 Chevrolet Express 2500, it's crucial to approach the diagnosis methodically. Start by checking the thermostat settings to ensure they are correctly adjusted to a cool temperature, as incorrect settings can often be the simplest explanation for the issue. Next, inspect the air filters; dirty or clogged filters can significantly restrict airflow, leading to poor AC performance. If airflow seems adequate, examine the refrigerant levels using a gauge, as low refrigerant can hinder the system's ability to cool effectively. Additionally, look for any visible signs of leaks around the AC components, as these can lead to refrigerant loss and diminished cooling. Testing the compressor is also vital; ensure it engages when the AC is activated, as a malfunctioning compressor may require repair or replacement. Lastly, check the electrical connections, including fuses and relays, to rule out any faulty wiring that could prevent the AC from operating. By following these steps, you can effectively diagnose common AC issues and determine whether further professional assistance is necessary.

What are the common problems that could cause the AC system to stop working in a 2018 Chevrolet Express 2500?

When the AC system in your 2018 Chevrolet Express 2500 ceases to function, it can be frustrating, especially during hot weather. One of the most frequent culprits is low refrigerant levels, which can occur due to leaks or insufficient charging, preventing the system from cooling effectively. Another common issue is a faulty compressor; if the compressor is not engaging properly, it will fail to circulate refrigerant, leading to a lack of cooling. Additionally, electrical problems such as blown fuses, malfunctioning relays, or damaged wiring can disrupt the AC system's operation. Clogged or leaking refrigerant lines can also hinder performance, as blockages prevent proper refrigerant flow, while leaks can lead to a loss of cooling capacity. Lastly, a malfunctioning blower motor can result in poor airflow from the vents, making it feel like the AC is not working even if the cooling system is operational. By understanding these potential issues, DIYers can better diagnose the problem and take the necessary steps to restore their vehicle's AC functionality.

How urgent is it to repair the non-functioning AC in a 2018 Chevrolet Express 2500?

When faced with a non-functioning AC in your 2018 Chevrolet Express 2500, addressing the issue promptly is crucial for several reasons. First and foremost, a working AC system significantly enhances the comfort of both the driver and passengers, especially during extreme temperatures. Beyond comfort, a functional AC plays a vital role in maintaining good air quality within the vehicle, which is essential for the health and well-being of everyone inside. Additionally, if you plan to sell or trade in your vehicle in the future, a well-maintained AC system can positively impact its resale value. Ignoring AC problems can lead to further complications, potentially resulting in more extensive and costly repairs down the line. Moreover, a malfunctioning AC can affect visibility by impairing defrosting capabilities, posing a safety risk while driving. Therefore, it is advisable to prioritize AC repairs to ensure comfort, health, safety, and the overall longevity of your vehicle.

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2018 Chevrolet Express 2500 AC Issues & Repair Costs