1999 Subaru Impreza Ac Isn't Working

Common Causes of AC Failure in Your 1999 Subaru Impreza and How to Restore Cool Airflow

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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 1999 Subaru Impreza 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 for a non-functioning AC in a 1999 Subaru Impreza?

When faced with a non-functioning AC in a 1999 Subaru Impreza, the initial diagnostic steps should begin with the simplest solutions before progressing to more complex issues. Start by checking the fuses and relays associated with the AC system; a blown fuse can often be the culprit, and replacing it may resolve the issue. If the fuse is intact, verify that the AC relay is receiving an electrical signal when the AC is activated. This can help identify any disconnections in the circuit. Next, inspect the AC relay itself by swapping it with a known good relay to rule out faults. Low refrigerant levels can also prevent the AC from functioning, so checking the refrigerant level is crucial; if it's low, you may need to add refrigerant. Additionally, examine the compressor and its clutch to ensure they are engaging properly, as a malfunctioning clutch can hinder performance. Look for any signs of refrigerant leaks around the compressor and condenser, as these can significantly impact AC functionality. Lastly, ensure that the cabin air filter is clean, as a clogged filter can restrict airflow and affect cooling efficiency. By following these steps, you can systematically diagnose and potentially resolve the AC issues in your Subaru, paving the way for a more comfortable driving experience.

What are the common problems that could cause the air conditioning system to fail in a 1999 Subaru Impreza?

When tackling air conditioning issues in a 1999 Subaru Impreza, it's essential to understand the common problems that can lead to system failure. One prevalent issue is refrigerant leaks, often stemming from worn O-Rings at the connections between hoses and components like the compressor and condenser. If you suspect a leak, a dye test can help pinpoint the source. Another critical area to inspect is the A/C compressor, which may fail due to a malfunctioning electronic clutch or worn bearings, often indicated by unusual noises. If the compressor is damaged, replacement is typically necessary. Additionally, check the condenser for physical damage or blockages, as these can hinder its ability to cool the refrigerant effectively. Electrical issues, such as a faulty A/C relay or blown fuse, can also disrupt the system's operation, so ensure these components are functioning correctly. Don't overlook the cabin air filter; a clogged filter can significantly reduce airflow and A/C efficiency. Lastly, regular maintenance is vital for an older vehicle like the Impreza, as it helps prevent issues related to age, such as refrigerant loss and general wear. By being aware of these common problems, you can take proactive steps to diagnose and potentially resolve A/C issues in your Subaru.

How urgent is it to repair the non-functioning AC in a 1999 Subaru Impreza?

Repairing the non-functioning AC in your 1999 Subaru Impreza is more urgent than it may initially seem, particularly when considering the potential consequences of inaction. A malfunctioning AC system can significantly impact driver and passenger comfort, especially in hot weather, where prolonged exposure to high temperatures can lead to serious health risks. Additionally, neglecting AC issues can escalate into more severe problems, such as compressor failure due to refrigerant leaks or electrical malfunctions, which can be costly to repair. Running the AC with low refrigerant not only strains the compressor but can also damage other components like the condenser, leading to further complications. While the upfront cost of repairs might appear daunting, addressing the issue promptly can prevent more expensive fixes down the line, ultimately preserving the vehicle's value and ensuring a comfortable driving experience. Therefore, if you frequently use your vehicle or live in a warmer climate, it is advisable to prioritize the repair of your AC system to avoid discomfort and potential safety hazards.

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