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-   -   What The Heck Is This? v3.0 (https://67-72chevytrucks.com/vboard/showthread.php?t=577471)

JCampbell 04-26-2013 12:20 PM
What The Heck Is This? v3.0
 
2 Attachment(s)
Anyone know what this is called and what it does? It’s in the air cleaner housing and has two vacuum lines coming off the bottom. I’m sure it’s some type of emissions part, but what, exactly?

Bonus points for anyone who can tell me how to bench test, as well.

Turbo85GMC 04-26-2013 12:28 PM
Re: What The Heck Is This? v3.0
 
My guess is that it's a vacuum switch, probably triggered by the intake air temp.

motornut 04-26-2013 12:55 PM
Re: What The Heck Is This? v3.0
 
think its for the stove pipe
stock snorkel flap
Posted via Mobile Device

beamn7 04-26-2013 03:11 PM
Re: What The Heck Is This? v3.0
 
Its the thermal vaccum switch that opens and closes the flap in the air cleaner housing intake snout to either get hot air off the stove pipe or fresh air....

83GMCK2500 04-26-2013 03:25 PM
Re: What The Heck Is This? v3.0
 
I *think* GM called it a Thermal Vacuum Switch.

EDIT: Thank you Jesse, I should've refreshed the page before replying. Walked away from PC for a while.

Skunksmash 04-26-2013 06:20 PM
Re: What The Heck Is This? v3.0
 
I don't think those actually still work on any of these trucks.

motornut 04-26-2013 08:44 PM
Re: What The Heck Is This? v3.0
 
Quote:
Originally Posted by Skunksmash (Post 6036507)
I don't think those actually still work on any of these trucks.
If the truck had to be etested wouldn't they have to check it?


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