My wife has a 2005 Forester that had a problem with overheating. It has had new head gaskets, thermostat, radiator & hoses done at a reputable shop. It no longer overheats but the temperature increases on the gauge when she goes up long hills. It does not go out of normal range but she insist that something is wrong and is going to get another vehicle {never have another Subaru}. It has close to 200,000 miles and runs great. The cruise light flashes and check engine light are on. Scan shows catalytic converter. Could the Catalytic Convertor be causing the rise in temperature or is this normal and she just didn't notice before? Thanks