Cascade Crew

nonsensekid20 · Posted: Wed Jan 19, 2011 7:20 pm Post subject: Heater Control vaccum

Is there a vaccum canister somewhere that creates vaccum for the heat controller?

aaron_sK · Posted: Wed Jan 19, 2011 7:56 pm Post subject: Re: Heater Control vaccum

Al Hasse · Posted: Wed Jan 19, 2011 8:03 pm Post subject: Re: Heater Control vaccum

nonsensekid20 · Posted: Wed Jan 19, 2011 8:34 pm Post subject:

OH! That's what that thing's for! I wasn't sure. hahahah.

nonsensekid20 · Posted: Wed Jan 19, 2011 8:36 pm Post subject:

How do you route it?

aaron_sK · Posted: Wed Jan 19, 2011 8:56 pm Post subject:

Do you have cruise control in the car? If so, you'll have to tee the cruise off of this same system.

You need to tap manifold vacuum somewhere, probably on a NPT port in an intake runner, or on the bottom of the carb somewhere. Do not tap into brakes, distributor advance, or ported vacuum signal.

Run a line up somewhere convenient, then tee it. One end to the reservoir, and the other end to the plastic vacuum hardline coming out of the wiring harness somewhere near the heater box.

You'll also need a check valve, your car originally had one that was a check valve and a tee both (Chevy was paying attention) but it may be long gone. Junkyard or Help aisle for that part.

Al Hasse · Posted: Wed Jan 19, 2011 9:09 pm Post subject:

This is a picture of said check valve, not mine but same type. Mine is hooked to full manifold vacuum. In this picture, the left side is hooked to manifold vacuum (or base of carb), the right side goes to to heater controls. The tee in the valve (coming toward you in the pic) goes to vacuum reservoir in driver side fender, and if equipped, cruise control.

nonsensekid20 · Posted: Wed Jan 19, 2011 9:12 pm Post subject:

I'll have to dig around in some boxes. I don't remember seeing any of that. Laughing

Can I hook a vaccum line straight up to an open port on my carb?

aaron_sK · Posted: Wed Jan 19, 2011 9:38 pm Post subject:

nonsensekid20 · Posted: Wed Jan 19, 2011 9:51 pm Post subject:

So I find a vaccum port where? On the manifold? As you might have noticed already, I need help.. hahaha

nonsensekid20 · Posted: Wed Jan 19, 2011 9:57 pm Post subject:

Oh, no cruise control btw.

BigDaddyVu · Posted: Thu Jan 20, 2011 5:57 pm Post subject:

BigDaddyVu · Posted: Thu Jan 20, 2011 6:02 pm Post subject:

Make sure you have have those check valves, back fire with blow vacuum lines off or blow a vacuum servo and make the car run like crap. and that happen to me twice. in my turbo car a put heavier check valves and super glued the vacuum lines together.

QwkTrip · Posted: Thu Jan 20, 2011 7:43 pm Post subject:

I'm hanging on to this thread! I think I removed half that stuff not understanding what it did! Laughing

nonsensekid20 · Posted: Thu Jan 20, 2011 9:32 pm Post subject:

yeah same. the new harness for ac delete doesnt have a vacuum tube.

aaron_sK · Posted: Thu Jan 20, 2011 9:36 pm Post subject:

The vacuum tube does not come from the HVAC harness, it comes from the large harness coming up through the passenger wheelwell. Unless someone cut it off specifically, it will be in there somewhere. It's black plastic hardline, so it tends to look like a ground wire until you try to bend it.

nonsensekid20 · Posted: Thu Jan 20, 2011 9:42 pm Post subject:

yeah i took that out. i'll have to dig around.

aaron_sK · Posted: Thu Jan 20, 2011 9:57 pm Post subject:

Haha... a cut-n-run guy, eh? Laughing

Worst case scenario you can dig around behind the dash and just splice in. The vacuum line is purple on the back of the HVAC control and it turns black before it dives into the harness IIRC.

iansane · Posted: Thu Jan 20, 2011 10:07 pm Post subject:

camarokid · Posted: Thu Jan 20, 2011 11:51 pm Post subject:

i ditched that stupid heater valve 10 years ago and have never had an isssue. id definetly recomend it to everyone, it also looks far better with it gone.