The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1974 GMC 15 Hundred

geezer#99 · 09-07-2014, 11:00 PM

To the thermac switch on the front of your intake.

09-07-2014, 11:00 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,777	Re: 1974 GMC 15 Hundred - Vacuum Hose Questions To the thermac switch on the front of your intake.