Heater and a/c on 2001 Jeep Grand Cherokee limited won't turn on. Has dual zone controls. could there be a fuse blown? Can't find a fuse for heater in fuse block in engine compartment.

I had the same problem and i had to replace the dual zone control center

Had a similar problem, had to replace the blend door housing, and resistor wiring, and the heater core. Apparently in the things I found online (I googled 01 GC Limited Blend door) it's a common problem. Common enough that my dealer had all the parts in stock for the blend doors (the heater core was unrelated, so they tell me).

Check fuse No.7(10A) in junction block it is under instrument cluster !