- Dec 14, 2002
- New Jersey
98 S-10 ZR2... Owned since new. Last time I did coolant, 2009 (!), no signs of discoloration that I can recall. I know the picture/compression is poor but I reviewed the original, and there's not really any sign though there is a little darkening in some of the fins. Still, this is an angle neck radiator in a 4.3, not meant/designed to take Dex (admittedly I did replace LIM gaskets in about 2005 as a preventative measure). Now, after 18 years of coolant in there, I'm starting to see some discoloration...