The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Where is vacume source for exhaust heat valve?

Longhorn321 · 02-12-2009, 03:34 PM

I'm sure if I'm wrong someone will correct me but IIRC, there is no vacuume line that goes to the heat riser. Heat just causes a bi-metallic strip to coil up and open the door.

OOOOPPS! I just looked and the heat riser is the thing between the exhaust manifold and the downpipe. I know what you are talking about tho on the air filter housing and I still say I think I remember the vacuume fitting does not actually get a vacuume hose fitted to it.

02-12-2009, 03:34 PM	#2
Longhorn321 Size Matters Join Date: Aug 2007 Location: Lyman, SC Posts: 9,189	Re: Where is vacume source for exhaust heat valve? I'm sure if I'm wrong someone will correct me but IIRC, there is no vacuume line that goes to the heat riser. Heat just causes a bi-metallic strip to coil up and open the door. OOOOPPS! I just looked and the heat riser is the thing between the exhaust manifold and the downpipe. I know what you are talking about tho on the air filter housing and I still say I think I remember the vacuume fitting does not actually get a vacuume hose fitted to it. __________________ "Reading the owners manual is only for quitters." Jason Harper, Bloomberg News. ...WOOOO HOOOO!!!! Last edited by Longhorn321; 02-12-2009 at 03:37 PM.