PeachParts Mercedes-Benz Forum - View Single Post

F18 · #14 10-25-2006, 06:03 PM

Quote:

Originally Posted by nhdoc

My '98 has a purge plug up on top of the block and it's mentioned in the WIS. I think it said to open the plug and while filling watch for coolant to come out of the hole (which never happened) so I filled from the tank and removed the plug and filled from there too. It took quite a bit of coolant through that little hole as I recall but it probably helped eliminate an air pocket up top by doing this.

I just forced air and coolant through by squeezing the top rad. hose like a pump until it was firm with fluid as it warmed up. And yes....you do not want an air pocket...it can cause a nasty hot spot that can easily warp heads.
On my last diesel the K1500 TD it had an actual purge valve on the thermastat housing which made changing and replacing coolant easy.
You could hear the air whistle through it when you bleed the system and when clear coolant finally came up out of it you were done and you closed it.