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Old 04-13-2016, 05:14 PM   #1
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1991 25' Airstream 250
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250 classic air intake query

My 1991 250 classic, which was a California vehicle has a flexible metal hose running from (I think) the air intake into the exhaust manifold or vice-versa. It's loose and looks like it needs replacing. I'm not familiar with the function of this, but am guessing that it is some kind of California emissions kit - can anyone confirm the purpose of this hose and whether there are any specs for replacement product? I'd like to see if I can get it in England, rather than import, but need to know what it is first!
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Old 04-13-2016, 07:25 PM   #2
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It's purpose is to channel warm air up around the exhaust manifold to the air cleaner assembly until the choke warms the engine up. Once the engine warms up there is a flap inside the air cleaner which then let's fresh air into the air cleaner from the front or the larger 4 inch hose assembly that pokes out of the front engine compartment above the radiator. This is all controlled by a thermal vacuum switch usually located around the thermostat housing if not mounted in the housing itself. The hose you are looking for is usually either black in color or silver and is either 1 7/8" or 2". Regards, Bob
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Old 04-14-2016, 01:47 AM   #3
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Thanks Bob, that's very helpful and makes sense. Does that pipe have a name and will any piece of flexible metal hose which is heat resistant suffice? In addition, does it need any kind of gaskets or hose clamp (in the UK, we call these jubilee clips.

allbest
Nick
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Old 04-14-2016, 04:51 AM   #4
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Quote:
Originally Posted by Boom Sounds View Post
Thanks Bob, that's very helpful and makes sense. Does that pipe have a name and will any piece of flexible metal hose which is heat resistant suffice? In addition, does it need any kind of gaskets or hose clamp (in the UK, we call these jubilee clips.

allbest
Nick
FYI, 'Jubilee' never existed as a brand in US, so that's why they are hose clamps here
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Old 04-14-2016, 06:52 AM   #5
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We have a "Nickname" for it when I used to work in a repair shop on Long Island. I can't repeat it here for fear of being banned from the form but it"t called Elephant ____ ! The boys at NAPA might call it pre-heater hose.
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Old 04-14-2016, 03:01 PM   #6
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Magic - that looks like the fella below! Do they need to have hose clamps around them? Also, can anyone advise on whether it is worth the additional expenditure on ACDelco kit?

thanks all!
Nick

CHEVROLET 1991 P30 7.4L V8 Fuel/Air Pre-Heater Hose
ACDelco Professional Pre Heat Hose is an ideal high quality aftermarket replacement component for one or more of the following vehicle systems: ignition, and/or engine fuel management. This premium aftermarket hose is manufactured to meet or exceed your expectations for fit, form, and function.
https://www.rockauto.com/en/moreinfo...9500&jsn=10560
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Old 11-10-2017, 07:00 PM   #7
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I have yet to see this hose clamped on either end. If it is loose I simple pull off one end and stretch the hose slightly. The air in the hose is not under any pressure. It is simply a route for heat to rise to the air cleaner.

Something to check is whether the flap in the air cleaner is opening when the engine is warmed up.

Lyle
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