1999 Mitsubishi Mirage AC Isn't Working

Common Causes of AC Failure in Your 1999 Mitsubishi Mirage and How to Restore Cool Air

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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 1999 Mitsubishi Mirage 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 1999 Mitsubishi Mirage?

When your 1999 Mitsubishi Mirage's AC isn't functioning, start by checking the thermostat setting to confirm it's set to a cool temperature and that the AC is activated. Next, inspect the fuse box for any blown fuses that could disrupt the AC system's operation. If the fuses are intact, listen for unusual noises from the compressor when the AC is turned on, as this could indicate a mechanical issue. It's also essential to check the refrigerant levels; low refrigerant can suggest a leak, so look for any oily residue around the AC connections or hoses that might indicate a leak. Additionally, ensure the AC clutch engages properly when the system is activated, and verify that all electrical connections are secure and free from corrosion. If these initial steps do not resolve the issue, it may be time to consult a professional mechanic for a more thorough diagnosis and repair.

What are the common problems that could cause the AC to stop working in a 1999 Mitsubishi Mirage?

When troubleshooting the air conditioning system in a 1999 Mitsubishi Mirage, it's essential to understand the common problems that could lead to its failure. One prevalent issue is a refrigerant leak, which can occur due to damaged components or seals, preventing the system from maintaining the necessary pressure for cooling. Another critical component to check is the compressor; if it malfunctions, the refrigerant won't circulate properly, resulting in ineffective cooling. Additionally, electrical issues such as blown fuses or faulty relays can disrupt the AC's operation, so inspecting these components is vital. A clogged or blocked condenser can also hinder airflow, often caused by dirt and debris accumulation, which can be easily cleaned. Furthermore, a faulty thermostat may lead to improper temperature regulation, affecting the overall cooling performance. Lastly, consider the wear and tear of various components like the blower motor or evaporator, as aging parts can significantly impact the system's efficiency. By systematically addressing these potential issues, you can effectively diagnose and resolve AC problems in your Mitsubishi Mirage, restoring comfort to your driving experience.

How urgent is it to address the non-functioning AC in a 1999 Mitsubishi Mirage?

When faced with a non-functioning air conditioning system in your 1999 Mitsubishi Mirage, it is crucial to recognize the urgency of the situation. A malfunctioning AC not only detracts from your driving comfort, especially during sweltering summer months, but it can also pose significant safety risks. Without proper ventilation, your vehicle's windows may fog up, impairing visibility and increasing the likelihood of accidents. Moreover, extreme heat can lead to driver fatigue, diminishing your focus on the road. Health concerns are also paramount; prolonged exposure to high temperatures can result in heat-related illnesses, particularly for vulnerable passengers such as children and the elderly. Additionally, neglecting the AC issue can lead to further complications, potentially escalating repair costs as the system deteriorates. Therefore, addressing the non-functioning AC promptly is essential to ensure a safe, comfortable, and healthy driving experience while also safeguarding your vehicle from more extensive damage.

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1999 Mitsubishi Mirage AC Not Working? Causes & Solutions