Rotted heater cores are usually caused by lack of anti corosion compount in old antifreeze. -Jim > There are probably SHOs running around that haven't had the coolant >flushed > for 5-10 (or more) years, and I have not heard of any coolant-related SHO > issues. __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com