Auxiliary A/C Operation
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With the auxiliary rear A/C (C69) option, there is no auxiliary heater system. This system has only a blower motor switch to regulate air speed. It does not use a air temperature actuator or a mode actuator. The lowest blower speed will have low auxiliary duct temperature. The highest blower speed will have high auxiliary duct temperature. The slower the air travels past the auxiliary evaporator core the more time the evaporator has to absorb the heat.