1999 Pontiac Bonneville. So I'm changing out the tensioner. One of the two steel nipples that mount to the tensioner with a bolt that goes to the heater core has a spring assembly in it. It is in bad shape and in need of replacement. I broke out all the remaining pieces and the spring so the debris won't go through the cooling system if I have to use it. If not available I guess I'll find out what effect not having the assembly in the steel nipple will have on heat come winter. Part number for the steel nipples and o rings that go on them would be helpful.

Moved from an old thread to its own new thread here.

The heater core is inside the dash, behind the firewall.

I think we're going to need some more information here, and maybe some pictures.

Wouldn't let me upload photos. Gets to 90% and hangs. Link to 2 pics on my google photos. https://photos.google.com/u/1/album/...kFh1SZ5MCzkXic

Are you talking about these?
I have only seen a spring in the tensioner itself, not sure of any other springs in that area..

It won't let me see without logging into Google.

How big are your pictures?

GM part number 24504476 $8 inlet ordered from local dealership. Dorman number 47214 $20.94 inlet

The outlet is discontinued from GM Dorman 47212 $21.41

Oh, those things!

Cool, glad you found them!