What is this in my heater hose? (Picture) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-16-2004, 04:28 PM
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What is this in my heater hose? (Picture)

Hey guys, I'm going to run new heater hoses on that 86 Caprice I've been working on. What is does this thing that is placed in my old heater hose do? Do I really need to use one?




Thanks

Mike

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Old 11-16-2004, 04:32 PM
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Looks like a vacum canister that opens a valve in the hose when the heater is turned on. If you don't use it you might have heat from your heater core all the time.
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Old 11-16-2004, 04:33 PM
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Well, it turns your heater off and on. It's a vacuum operated heater valve. There should be a vacuum line going from it to the heat control in the dash. This is usually turned either full off or on and an air door opened to let more or less heated air in the car.
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Old 11-16-2004, 05:00 PM
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crap like that is the kind of stuff that never goes back on any of my cars, lol
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Old 11-16-2004, 05:12 PM
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Valve

Doc here:

If you don't use the heater but a few months of the year, you CAN replace that with a stainless steel Ball valve, and only turn it on when you want to use the heater in cool months...Besides...The S/S valves really look cool, and don't rust.... Lol!

Or if you Don't use the heater at all...Chuck it!

Doc
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Old 11-16-2004, 06:22 PM
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Quote:
Originally posted by Dizturbed One
crap like that is the kind of stuff that never goes back on any of my cars, lol
Yea, thats how I feel. I've managed to eliminate just about everything else GM crammed under that hood.


DocVette, NovaSS350, farna, thanks for the help. I need the heater running from November to March in my area. I'll sand the rust off and paint it black so it blends in.
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Old 11-16-2004, 06:26 PM
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Put some WD-40 on it too, so it doesn't seize up, if it isn't already.
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Old 11-16-2004, 06:51 PM
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vacuum valve

Do yourself a favor and make sure the vacuum diaphram in the canister is good. You can do this by simply applying vacuum to the nipple. A good way would be to put a hose on it and suck on it. If you dont feel vacuum in the hose, then you have a leaking diaphram and it should be replaced anyway.
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Old 11-16-2004, 07:30 PM
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I put one of those into my s10 on purpose (only it was new and not rusted to hell). I set it up so it will cut off flow to the heater core only when you turn the AC on MAX. This will cause the coolant that would have gone thru the heater core to go thru the radiator. It is like having a higher volume pump. The other thing the factory would do was put a restriction on one of the heater core pipples.

On my K5 I just replaced it with a ball valve because none of the AC controls move any more
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Old 11-16-2004, 09:43 PM
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80's BOPC used those to control the flow to the heater, vacuum operated. You probably wont see that on 87's and later. My 84 has one on it... in better condition.
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Old 11-16-2004, 11:15 PM
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The ones I know of are used to keep the heat off. Not a prob this time of year,but come summer you may regret eliminating it.
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