Quote:
Originally Posted by LUVMBDiesels
I had to replace the radiator on the Suburban last summer. After running DEATHCOOL since 1999 the radiator tanks were 1/3 full of orange greasy crap! I was seriously thinking of putting G-05 in the truck, but I did not want to have issues with mixing it with the remains of the Dex...
FWIW, I did a citric acid flush on the truck a couple years ago and it still was full of gunk!
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I bought a 2001 Chevy venture a couple months ago - read a lot about the Dex-Crap and the known problem with failing IM failing and leak collant into the engine - GM knew about, but refused to fix the problem.
Anyway, the POs reported no problem with coolant loss or overheating - and I haven't noticed any problem after these first few months. I did drain the coolant to attempt to get rid of the Dex-Crap. The resevoir did have some of the greasy gunk and there was some on the interior of the radiator cap as well. I cleaned up as best as I could - flushed, and refilled with G-05. Even after a flush, the G-05 is tinged the dreaded orange again, so I will hit it again next year to try and get as much of that stuff out as possible. It is also advised, although I still need to do it - to replace the radiator caps, in some models they were updated.
Is there some known issue with mixing G-05 with Dex, I assumed anything was better than Dex and the G-05 would offer the same protection. Actually, some attribute the failed IM gaskets to the Dex and suggest that G-05 is better in that respect.
Oh, and regarding the Stop-leak theory. recently my father-in-law and I did some work on his van - it had a corroded coolant pipe that needed replaced. He realized it on a long trip and so added a bottle of the stop-leak. After purchasing a new pipe, we drained the old coolant which was dark in color and had little bits of junk from the stop-leak. So, it's possible that this is your issue, but I would also check out the other ideas here too.