need advice on cadillac catera heat issue

Hey everyone, 97 or 98 catera I'm looking at for a friend. Has all the digital heat and stuff on the dash. Blower blows just cold air. heater hoses
are hot. I've read about some problems with the mixing door actuators. Any advice on where to start dis-assembly to locate these actuators before I start pulling the panels off. I'd rather not remove something if I don't have to.
thanks, Chris
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