ok, so everyone knows the "roar" daks/durs get sometimes when you first start it up and drive off. Well, now mine does it like ALL THE TIME. If im lucky, it'll stop after like 10 minutes. Its not like its getting too hot or anything. Also, when I have the heater on, there is some sort of clutch type thing clicking on and off like all the time. Is this the same as the fan clutch? I dont know.. Im confused. If I have to replace this, how expensive is it and how hard is it to do?