actually the flush i was talking about is a pint bottle you buy and throw in the system (for 10 mintues) to dissolve deposits out of your radiator... in ten minutes???, it must be some acidic crapola. and speaking of correlation, i had a water pump go out 3 days after using it.. correlation does not necessarily mena causation, but there it was...<P>yea, be careful flushing you system with cool water... if the temp difference is too much, it could crack the block like glass (or so i've heard...)<P><BR><P>------------------<BR>Gene Bosche'<BR>Mean_Gene@Pirate4x4.com<BR>1988 Toyota 4Runner SR5 V6<BR><A HREF="http://www.toyotaoffroad.net/gene/4X4/4Runner/4Runner.htm" TARGET=_blank>My 4Runner Website</A>