Heater AC Control Vaccum switch

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Jun 21, 2019 | 05:27 PM

R6n350GT

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Racer

Joined: Dec 2014

Posts: 328

Likes: 30

Heater AC Control Vaccum switch

I have completely redone my AC / Heater system.
Not getting air from the middle or side vents on c3 1980 corvette

The issue is the numbers 1 to 5 are not on the black selector switch so how do i know which order to put them in and if 2 port is vented or capped..

Here is how it was before i got new lines that dont fit in the original plug (and never fully worked anyway)

This is the way my stock rubber plug had them orientated but i never got middle air vents working

This is how it looks according the the schematic if thats how its orientated

This is how it would be if the schematic is showing you the back side of the switch...

Here is another option that someone posted up.

Which is it? and vent or cap the 2 port ???

Thank you!

Last edited by R6n350GT; Jun 21, 2019 at 05:34 PM.

Jun 22, 2019 | 12:29 PM

0Willcox Corvette

Former Vendor

Joined: Aug 2006

Posts: 76,656

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From: Jeffersonville Indiana 812-288-7103

St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15

This is the factory schematic and the fitting will only fit on the switch one way. Do you not have the original connector for the switch? If not post back, the only issue is I can't get to one for two weeks. I'm out of town and no one knows where they are stored but I'm sure I have one.

Jun 23, 2019 | 08:25 PM

R6n350GT

Thread Starter

Racer

Joined: Dec 2014

Posts: 328

Likes: 30

Quote:

Originally Posted by Willcox Corvette

Thank you wilcox.
I dont have the plug anymore

This is the only way i get it to work

Max and normal + cold = air through the front and side vents + re circulation air (vent open by passenger foot)
Vent + cold = air through the front and side vents, slight air from top and heater vents + fresh air (vent closed by passenger foot)
HTR + Hot = air through the feet heater vents (slight through the top window vent, front and sides) + re circulation air (vent open by passenger foot)
DFR + Hot = air through the heater vents and top window vent + fresh air (vent closed by passenger foot)

Noise of the controller
Off = slight hiss noise + re circulation air (vent open by passenger foot)
max and normal = no noise
Vent = slight hiss noise
HTR = no noise
DFR = hiss noise

That normal ?

Jun 27, 2019 | 06:29 AM

R6n350GT

Thread Starter

Racer

Joined: Dec 2014

Posts: 328

Likes: 30

how does the heater shut off valve work ?
As the switch is towards the heat the bypass valve allows vacuum to the line going to the hot water shut off valve.
When vacuum is applied there is less heat, when not applied there is more heat. Which is strange as the slider needs to be across to heat for the heater yet it then applies vacuum to the valve ????

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