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THE "10" SILVERADO · 08-07-2012, 06:58 PM

There is supposed to be a door with a rubber seal attached to a vacuum actuator so you have to have the heater on (at least I think, maybe it is to keep the cabin pressure) to have it open. Either way there needs to be a door there to keep moisture out.
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08-07-2012, 06:58 PM	#39
THE "10" SILVERADO Registered User Join Date: Sep 2010 Location: Marble Falls, TX Posts: 1,575	Re: 1978 big ten build There is supposed to be a door with a rubber seal attached to a vacuum actuator so you have to have the heater on (at least I think, maybe it is to keep the cabin pressure) to have it open. Either way there needs to be a door there to keep moisture out. Posted via Mobile Device __________________ Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9