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04-26-2013, 12:20 PM
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#1 |
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Account Suspended
Join Date: Apr 2008
Location: Hesperia, Ca
Posts: 1,332
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What The Heck Is This? v3.0
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. |
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04-26-2013, 12:28 PM
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#2 |
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Registered User
 
Join Date: Apr 2005
Location: Medford, MA
Posts: 307
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Re: What The Heck Is This? v3.0
My guess is that it's a vacuum switch, probably triggered by the intake air temp.
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04-26-2013, 12:55 PM
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#3 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: What The Heck Is This? v3.0
think its for the stove pipe
stock snorkel flap Posted via Mobile Device
__________________
John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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04-26-2013, 03:11 PM
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#4 |
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Registered User
Join Date: Oct 2011
Location: Wildomar, CA
Posts: 466
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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....
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04-26-2013, 03:25 PM
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#5 |
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Registered User
Join Date: Sep 2009
Location: Beaverton, OR from WA State
Posts: 1,515
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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.
__________________
Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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04-26-2013, 06:20 PM
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#6 |
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Registered User
Join Date: Sep 2012
Location: TX
Posts: 1,014
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Re: What The Heck Is This? v3.0
I don't think those actually still work on any of these trucks.
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04-26-2013, 08:44 PM
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#7 | |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: What The Heck Is This? v3.0
Quote:
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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