Expert Explains What to Check on Used Car Air Conditioning Systems This Summer

As summer heat intensifies, ensuring a car's air conditioning system is functioning correctly is crucial, especially when purchasing a used vehicle. Rainer Uukkivi, CEO of Longo Group Eesti, explains what potential buyers should inspect to avoid discomfort and costly repairs.

Uukkivi emphasizes that the air conditioning system is more than just a comfort feature; it also helps dehumidify the car's interior. He advises starting with a simple test: turn on the AC and place a hand near a vent. A properly working system should produce noticeably cool air within one to two minutes. Any delay or lack of cooling could signal a malfunction.

Buyers should also listen to the compressor's sound. A soft hum is normal, though older cars might make a single click when the AC engages. Grinding, whining, or knocking noises can indicate worn bearings or internal compressor damage, suggesting a need for repair. Additionally, inspecting the condenser, located at the front of the car, is vital. This component is exposed to road debris, moisture, and salt, which can cause damage. A corroded or damaged condenser, even if the AC currently works, increases the risk of leaks or failure.

Unpleasant odors emanating from the vents, described as musty or like an old cellar, often point to contamination in the evaporator, ventilation ducts, or cabin filter. Mold, bacteria, and dirt thrive in the moist environment created by the AC. Such smells can cause irritation and allergic reactions in sensitive individuals and signal a lack of proper maintenance. Replacing the cabin filter and performing an antibacterial cleaning of the system are often necessary solutions. Uukkivi also touches upon leak detection, noting that refrigerant and lubricating oil circulate in a sealed system, and even micro-cracks can lead to invisible leaks.