Auto. A/C Systems: Description

The Automatic Temperature Control (ATC) system, like the manual air conditioning system, utilizes a "reheat" method of air conditioning. With this type of system, all air flow from the blower passes through the evaporator core. Temperature is then regulated by reheating the cooled air to the desired setting. Temperature of the outlet air is varied by the temperature blend door which controls the percent of cooled air that flows through and/or around the heater core. From this point it is mixed and directed into the distribution plenum. The air is then diverted to the heater ducts, the defroster nozzles, or the air conditioning registers.

NOTE: Ford, Mercury, Lincoln Town Car and Mark VI use a fixed orifice tube refrigeration system and a 6-cylinder compressor. Thunderbird and XR7 use by-pass orifice and a 2-cylinder compressor.

The necessary additional control refinements and components to obtain automatic temperature control have been added to the basic manual system.