A low refrigerant charge ‘can cause major damage to your car’s air conditioner. Unlike some compressors used in the ’70s, which . had their own oil supply, most current designs rely on a sufficient refrigerant charge to carry oil through the system. If that charge is lost – either partially or completely – the compressor may starve for oil and fail shortly thereafter. This results in a major expense, not only tor the compressor, but tor related items that will have to be replaced if the compressor fails.