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What is your question?
Excellent maint. began running in 3rd qtr Hot range occasionally for past 5 mos Only while City driving. Never reached 'Red' zone! on 9/21 so close to Red zone, cut it off while idling at light and it would not restart. pushed off road. Professional diagnosed as head gasket blown due to driving hot & Fluid mixed w oil in engine. bc of mileage Not worth repair costs; eng rplcmt approx $4k. Mechanic friend recommends leak sealant product used successf'ly several times. Found similar product online--'Steelseal'. GOOD OR BAD IDEA!
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I would NOT recommend using any type of leak sealant, usually causes more damage and will not fix the problem. What engine is in your vehicle, 3800? I would strongly recommend having it checked out professionally before you do anything else, it is very possible that it is not the head gaskets, if it is the 3800 engine there is a good chance that it is a problem with the intake manifold. If you would like to have a GM Master Technician check it out we would be happy to schedule you in today, our diagnosis charge is only $69.95. If you do the repairs the $69.95 is credited toward the repair. Please call me today, Gene Woodson, Suttle Motors, 12525 Jefferson Ave. Newport News, VA. 757-886-1819.