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this is a little weird but going down the road heat blows out of the vent fine but when i pull up to a stop or the car is idling the heat will switch to the floor on its own what the heck causes this?

I have an 87 Cutlass Supreme and can not figure out why the heat is not good. The engine gets up to temp no problem and both heater hoses are hot. When I switch from cold to hot it is switching because I can feel the difference the only other issue is that the blower does not work on high but I...