Guys I've been having problems with my mustang's heat lately. I started the car and let it sit for 20 minutes, the top radiator hose is hot, and the hoses going into the heater core are hot. I checked the blend switch and it's working just fine (I reached under the dash and felt the door move. The temp gauge doesn't seem to get above the L in normal, unless I drive on the parkway and do about 70 ( then it gets all the way up to the N). I didn't think the thermostat would affect my heat that much but apparently it does. I heard also that the clutch fan could affect it, is this true?