waterpump, ? Heater not working, gage goes nuts, flushed the rad. I have to keep bleeding the line because it seems like air is getting in the line and the the gage goes haywire. not sure if this is the heater core or what. when we bleed the line to get ride of thr air the heater will work for a short period of time and then turn cold and the the gage will also go nut again can anyone help me out?