01 Cadillac Deville is running hot I know the head gasket bout to go.
I want to put blue devil in it and I know it will repair it for a while. but it runs hot before I can
get it in. only half the radiator gets hot?
Never ever put anything in the cooling system like blue devil or head gasket repair, it causes more problems than it cures, if your radiator is acting like that, then it is indicating that your have a plugged radiator already, you really need to cure the problem not the symptom. I know replacing head gaskets on a Cadi can be very expensive, but check your cooling system carefully first.
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