When temperatures rise, your vehicle’s air conditioning system has to work harder to keep you cool. Over time, the A/C may not blow as cold as you want, even though the control is at the coldest setting. Eventually, the compressor will wear out and need to be replaced. Probably the most important part of the air conditioning system, the compressor ensures a constant flow of refrigerant to cool the air channeled into the passenger cabin. Lack of cold air plus noises from clattering bearings or a squealing belt are signs of compressor failure. Although this repair is relatively straightforward, it’s best done by a professional versed in evacuating and recharging the compressor’s refrigerant.