jusjofok Posted October 14, 2009 Share Posted October 14, 2009 In my 82 280zx I am having some problems with the heat and air controls. When I accelerate quickly (vacuum drops) the air stops coming from the vents and gets diverted to the floor. I back off the throttle (increase system vacuum) and the air comes back to the vents. What is the main cause of this? It started when I had the drivers side knee panel off that has the vacuum switch on it for god only knows what, I tried swapping the lines around on it but it didn't do any good. Any recommendations? I suppose there is a check valve in the system somewhere (near the vacuum canister??) but I haven't looked yet. Also, I believe this to be a separate issue but the system will never go to defrost (air just barely comes out of the ducts with fan on high). Should I just replace the vacuum switch (the ac/heat/defrost/mix/floor one) or am I not thinking correctly? Thanks guys, assistance would be appreciated. I can deal with the air going to the floor when I stand on it but I kinda need the defrost cause it is getting cold. Thanks Quote Link to comment Share on other sites More sharing options...
woldson Posted October 15, 2009 Share Posted October 15, 2009 Lot of hoses back there, they may need to be checked. The knee panel switch is for a/c to flow to the under dash vents. Mostly I keep it closed. Quote Link to comment Share on other sites More sharing options...
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