Ron, Chrysler Corp used to have a manifold heat riser solvent that came in a little rectangular metal can like 3 in 1 oil. It is a specific formula for heat risers. I assume that they still have it. It is great stuff. I used some several years ago to free up a frozen heat riser on my 300G. I put some on the heat riser, let it set for a week and it was starting to show some signs of movement. So, I put some more on and let it set for another week. It freed up and I was able to get total movement back. Note: forwarded message attached. [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Home is just a click away. Make Yahoo! your home page now. http://us.click.yahoo.com/DHchtC/3FxNAA/yQLSAA/8LmulB/TM --------------------------------------------------------------------~-> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/