Seems like my heater doesn't get too warm in the wintertime...Could it be a clogged heater core? The auxilliary heater does get pretty warm, but the main heater stays pretty close to luke warm. The engine heats up to normal temp. I tried to tape a lrge piece of cardboard over the radiator, but that didn't get it any hotter any faster. I would hate to have to pull the heater core unless it will do some good. Thanks for the help.