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heater controll question

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on my 86 hatch, the heater controll vac hose, comes out of the firewall, under the spare tire. it goes direclty to the manifold, and works good. on my ea82 85 wagon, i have the hose routed to the same spot on the manifold. it seems to make the heater switch from the normal ac mode, to the floor heat, to the defrost :drunk:

all on its own when im driving, do i have to USE that round vac ball that i threw away, or do i need to hook it up different on my ea82 than my ea81 car?

I was having a similar problem on my 86 t wagon, I know I know turbo is a whole nother ball of wax, Anyways it turned out to be my pushbuttons control was leaking pressure and everytime I had positive or zero manifold pressure the air would transition from heater (foot) vents to AC (dash) vents.

 

I would say that you have a small vac leak either in the line or in the pushbuttons. Not sure how to test the pushbuttons I just got one from the JY and hoped for the best. Sorry if this doesn't help

the round ball thing is a reservoir, holds vac to run accessories when you have no engine vac, that is your program

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