Author Topic: Climate Control Vacuum  (Read 5310 times)

Offline Jon87V20

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Climate Control Vacuum
« on: October 07, 2010, 06:56:17 pm »
Hi, My truck initially came with air conditioning but no longer has any of the components. I just rigged the blower motor to run on high at all times via a relay. Now I'm wondering since the truck no longer has a vacuum canister, is it possible to just run the vacuum line to the manifold to get it to change between defrost, heat etc.?
1987 Chevrolet Suburban V20 Silverado
350ci TBI TH400 NP208

Offline screamin86

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Re: Climate Control Vacuum
« Reply #1 on: October 07, 2010, 07:05:19 pm »
Should be able to that's how mine is setup.
86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline rroeder96

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Re: Climate Control Vacuum
« Reply #2 on: October 07, 2010, 07:08:14 pm »
im having the same problem with my truck where on the manifold can i hook a line to its a 305 v8 if that helps thanks..

Offline modular93fox

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Re: Climate Control Vacuum
« Reply #3 on: October 07, 2010, 07:40:53 pm »
I removed the vaccum ball when I did the 5.3 swap... I have the one line comming from the firewall going strait into the manifold. works fine unless you floor it ... well then you no longer have vaccum ... other than that, works great.
1987 5.3 4l60e Silverado - daily driver with A/C,P/W,P/L,TILT, HID projectors & 13.8" Rear Disc Brakes
A poor man buy's it twice

Offline Jon87V20

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Re: Climate Control Vacuum
« Reply #4 on: October 07, 2010, 08:16:29 pm »
Ok thanks for the good news. Also just out of curiousity, why even have the vacuum canister? Is it just there to ensure that you have vacuum for the controls even at wide open throttle? I know personally I'm usually not adjusting my heating situation while gettin' on it.
1987 Chevrolet Suburban V20 Silverado
350ci TBI TH400 NP208

Offline screamin86

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Re: Climate Control Vacuum
« Reply #5 on: October 07, 2010, 10:27:33 pm »
I've got a 160tstat and a electric fan that runs all the time and I don't think I could stand to keep my heat on full blast it still cooks me I believe I can deal with it cutting out at wot lol
86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline sireal

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Re: Climate Control Vacuum
« Reply #6 on: October 19, 2010, 08:57:28 pm »
If you have a stock motor or mildly built motor it will work, but if you have something built up with a big cam you may not have enough vacuum. I had to put in a vacuum canister  :(