With Air Conditioning

Fig 1. CCOT A/C System Components:

DESCRIPTION
The CCOT (Cycling Clutch Orifice Tube) A/C system performs heating and cooling. Air enters the vehicle and passes through the cooling unit (evaporator) and through (or around) the heating unit. The system is called a "reheat" system. The evaporator cools the air passing through the core when the air conditioning system is in the cooling mode.

A pressure sensing switch, located near the top of the accumulator, controls compressor operation. The switch responds to pressure changes to turn the compressor ON or OFF.

OPERATION
Outside air or recirculated air enters the system and is forced through the system by the blower. As the air passes through the evaporator core, it receives maximum cooling if the air conditioning controls are positioned for cooling.

From the evaporator, the air enters the heater and air conditioner selector duct assembly where, by means of diverter doors, it passes through or bypasses the heater core in proportions necessary to provide the desired outlet temperature. The air enters the vehicle through either the floor distributor duct or the dash outlets.

During cooling, the air is cooled by the evaporator to below comfort level then warmed by the heater to the desired temperature. During "heating only" the evaporator does not operate and ambient air is warmed to the desired level.