Little background About a month ago my 97 vulcan was overheating at idle, turned the heater on and no heat. Had the thermostat replaced and fixed the problem of the overheating. Now the heater blows cool to warm when idling, then blows hot when engine rpm is increased. Idles when in drive is about 700 and heater blows out cool and when in park it is closer to 1000 and comes out warm not hot. Any idea what the problem could be?