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all i can say
is you loose a ton of air flow volume through the ducts
i would start by removing the ceiling cover and open up the plate that blocks off the air and directs it to the ducts. then look inside and make sire the duct is open and the air is going in them vice between
if you only have one roof a/c then you may just have to close the ducts in front if you want cool air to the rear.
my bus has two units so i installed dampers that prevent the front ac air from going past the kitchen and the rear one only cools the bath ad bedroom.
simple physics is there is not enough air volume to blow hard to the rear
a floor fan may help to move air aft
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retired Navy driving the short bus 2008 Tuscany 4056
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