The fan shouldn't be running, but there is constant hot air that flows in the car from flaps that don't quite close shut. There has been a lot of talk about putting the 2002 type valve on the heater hose in order to cut the flow into the car, and few have done this. Don't also forget that a lot of heat is from the engine, tranny and exhaust that just come in from the console area and or from shifter opening. Also, make sure the foam on the shifter opening is still there or good.
BTW, did you see the Champion colored CSi? Here is the pic again.