At what temperature should the coolant be to not be harmful to my 1998 Cadillac deville
Normal operating temperature should be between 160 and 190 degrees depending on what thermostat you have installed. If it is running much hotter than 190 then you need to service your cooling system.
My 1993 El Dorado Cadillac 167000 and it reaches 236 temp what's wrong
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