2018 Kia Forte AC Isn't Working

Common Causes of AC Malfunctions in Your 2018 Kia Forte and How to Fix Them

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Reviewed by
Aisha
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 Kia Forte 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 Kia repair shops?

RepairPal Certified shops can diagnose and repair your 2018 Kia Forte climate control issues. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Tuffy Tire & Auto Service Center - Grandview

4.7
(81)
2.39 mi
1524 W 5th Ave
Columbus, OH
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Opens 8:00 AM Mon
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Excite Auto Repair & Towing

4.4
(15)
5.94 mi
3430 Westerville Road
Columbus, OH
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Opens 9:00 AM Mon
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All In Auto Service

4.9
(22)
6.56 mi
5200 Fisher Road
Columbus, OH
Closed
Opens 8:00 AM Mon
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Tuffy Tire & Auto Service - Grove City

4.4
(520)
6.67 mi
2131 Stringtown Rd
Grove City, OH
Closed
Opens 7:30 AM Mon
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What are the initial diagnostic steps to take when the AC isn't working in a 2018 Kia Forte?

When your 2018 Kia Forte'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 misconfiguration. Next, inspect the air filters; if they are dirty or clogged, replacing them can significantly improve airflow and AC performance. After that, examine the refrigerant levels using a pressure gauge, as low levels can lead to warm air blowing from the vents. If you suspect a refrigerant leak, look for oily residue around the AC connections and hoses, as this can indicate where the refrigerant is escaping. Additionally, test the compressor to confirm it engages when the AC is activated; a malfunctioning compressor may require repair or replacement. Finally, check the electrical connections related to the AC system for any signs of corrosion or looseness, as these issues can disrupt the AC's operation. By following these diagnostic steps in order, you can effectively troubleshoot and potentially resolve the AC issues in your Kia Forte.

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

When the air conditioning in your 2018 Kia Forte 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, resulting in warm air blowing from the vents. Additionally, electrical problems such as blown fuses or damaged wiring can disrupt the AC's operation, making it essential to check these components. Clogged or leaking refrigerant lines can also hinder performance, as blockages prevent proper flow, while leaks can lead to a loss of refrigerant. Lastly, issues with the condenser or evaporator can significantly impact the system's ability to transfer heat, further complicating the cooling process. By understanding these potential problems, DIYers can better diagnose and address AC issues in their Kia Forte, ensuring a comfortable driving experience.

How urgent is it to address the non-functioning AC in my 2018 Kia Forte?

When your 2018 Kia Forte's air conditioning system fails, the urgency to address the issue cannot be overstated. A malfunctioning AC compromises your comfort, especially during sweltering summer months or on long journeys, making driving an unpleasant experience. More critically, it can pose safety risks; without a functioning AC, foggy windows can obscure your visibility, increasing the likelihood of accidents in poor weather conditions. Additionally, a non-operational AC can lead to poor air quality inside the vehicle, which is particularly concerning for individuals with respiratory issues or allergies, as it may allow pollutants and allergens to circulate freely. Furthermore, neglecting to repair the AC can diminish your vehicle's resale value, as potential buyers are often wary of known issues. Therefore, addressing the non-functioning AC promptly is essential not only for your immediate comfort and safety but also for the long-term health of your vehicle and its market value.

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