1990 Mitsubishi Eclipse AC Isn't Working

Common Causes of AC Failure in Your 1990 Mitsubishi Eclipse and How to Fix Them

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Reviewed by
Andrew Hajjar
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 1990 Mitsubishi Eclipse 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 1990 Mitsubishi Eclipse?

When diagnosing the AC issue in a 1990 Mitsubishi Eclipse, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex assessments. Start by inspecting the visible components of the AC system, including the compressor, condenser, evaporator, and refrigerant lines, for any signs of damage or leaks. Next, test the compressor to ensure it engages when the AC is activated; listen for a clicking sound that indicates proper function. Following this, check the refrigerant levels using a gauge, as low levels may suggest a leak. It's also crucial to examine the AC belts for wear and proper tension, as these can significantly impact performance. Additionally, assess the electrical system by inspecting fuses, relays, and connections to confirm they are operational. Finally, evaluate the airflow from the vents; weak airflow can indicate issues with the blower motor or ductwork. By methodically following these steps, you can effectively identify the root cause of the AC problem in your Mitsubishi Eclipse.

What are the common problems that could cause the AC to stop working in a 1990 Mitsubishi Eclipse?

When your 1990 Mitsubishi Eclipse's air conditioning system stops working, several common issues may be at play. One of the primary culprits is a refrigerant leak, which can occur in various components such as hoses or the compressor, leading to insufficient cooling. Another frequent problem is a faulty compressor; if this vital part fails, it cannot circulate refrigerant, rendering the AC ineffective. Additionally, electrical problems, including blown fuses or faulty wiring, can disrupt the AC's operation, preventing it from functioning correctly. A clogged or blocked condenser can also hinder performance by restricting airflow, often due to dirt or debris accumulation. Lastly, a malfunctioning thermostat may fail to regulate temperature properly, resulting in the AC not blowing cold air or not activating at all. By understanding these common issues, DIYers can better diagnose and address AC problems in their Mitsubishi Eclipse, ensuring a more comfortable driving experience.

How urgent is it to repair the non-functioning AC in a 1990 Mitsubishi Eclipse?

Addressing the non-functioning AC in your 1990 Mitsubishi Eclipse is not just a matter of comfort; it is a critical issue that requires immediate attention. A malfunctioning AC system can lead to uncomfortable driving conditions, especially during the sweltering summer months, making long trips unbearable. Moreover, the health implications of driving without adequate cooling can be severe, as extreme heat can result in heat exhaustion or dehydration, posing risks to both the driver and passengers. Additionally, a well-functioning AC system contributes positively to the vehicle's resale value; potential buyers are often deterred by the prospect of costly repairs. Ignoring the symptoms of a failing AC can also lead to more significant issues down the line, resulting in extensive and expensive repairs that could have been avoided with timely intervention. Therefore, it is crucial to prioritize the repair of your AC system to ensure a safe, comfortable, and valuable driving experience.

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