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Discussion Starter #1
I'm at the point of pulling what few hairs i have on my head out can anyone help?
I recently changed out the water shut off vacuum switch and the defroster vacuum canister on my 79 vette.
The problem is now the only way the defroster vacuum will engage is if I switch the heat selector to cold?
It seems its backwards and i cant figure it out? Ive checked the vaccum lines, double checked the defroster cannister, everything seems to be working but I cannot figure out why i have to switch the heat selctor to cold??? Any suggestions?
By the way to say the system was bubbaized before i got is is an understatment.
 

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I'm sorry for your issue's! Nothing worse that some Rigged Crap that you have to deal with...

unfortunetly, I wont be any help...I haven't got that far into my build to really learn all the in's and out's of the HVAC system.
I will be watching this thread for any pointers for when I get there.
 

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93 Posts
Discussion Starter #4
Jerry , THANK YOU. I found it,!! crossed vacuum lines. I did what we all typically do from time time, I got frustrated and let it kick my ass. I d/l the diagram your sent and sat down, calmed down, and found it right away!
Thank God i got digital corvettes and people like you to turn to!
I owe you one!
 
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