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I have the same problem
I just posted about a similar heating problem on someone's '99. I have a '97 that had heating problems. The clicking you describe is PROBABLY coming from the actuator ($45) bolted to the air box under the dash. On my car, when I turned the heat to a particular spot on the dial, there would be a repeated thumping noise - like the door was opening and then falling back down. I pulled the actuator out and propped up the door manually to the heat position by inserting a 1" square thin piece of plastic sideways into the metal "banana" bracket that moves the door on the face of the air box (under the dash). Push the bracket all the way up, then insert the piece of plastic to keep it in this position. I'm pretty sure I need to replace my actuator, but I haven't definitively proven this yet. In the meantime, I've backflushed my heater core (see my other post) and with the door propped up, I have plenty of heat.
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