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Class of 69 · 08-25-2003, 08:31 PM

vacuum source from engine to #1...vacuum to vent #2. The vacuum to the vent also controls the outside air door under the cowl, and the hot water shut off valve in the heater hose.

08-25-2003, 08:31 PM	#3
Class of 69 Registered User Join Date: Mar 2003 Location: Stillwater MN Posts: 1,166	vacuum source from engine to #1...vacuum to vent #2. The vacuum to the vent also controls the outside air door under the cowl, and the hot water shut off valve in the heater hose. __________________ 69 GMC K10 ..some restoration required....still..