hey scotty kevin from boston always with questions ill let my 98 volvo v70 warm up the operating tempature ill turn the heat on the the needle would drop a little then ill turn the heat off temp gauge goes normal again when heat is on it will stay normal not sure whats going on there help

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My oldest son lives in Norton, just south of you. Man, those Pats looked insane the other night. Realize that your heater core is a small radiator, you turn on the heat, that dissipates heat from the engine and often the temp gauge will dip some then