Inlet hoses on Diesel Clubwagon for backflush

I have a 1993 Clubwagon with the 7.3 diesel. For routine maintenance, I want to back flush the cooling system using the Prestone flush kit. It seems as if there are two inlet and two outlet hoses on this model. The van does have rear heat & A/C. Does it have two inlet hoses? If so, would I have to use two flush tees? If not, which inlet hose should be fitted with the flush kit. Thanks much.