Only the vehicles with A/C have the water valve to shut off the hot coolant for 'Max A/C' as stated. The 'Heater-only' vehicles just have straight 'to & from' heater core hoses.
Otherwise the heater core always has circulating coolant. The temperature control lever will blend the fresh air & heated air with an adjustable 'blend air' door.
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Otherwise the heater core always has circulating coolant. The temperature control lever will blend the fresh air & heated air with an adjustable 'blend air' door.
