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

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