I've got a '95 lergacy with the digital climate control heater system.... was working fine but now it seems to be stuck on hot -- If I turn the temperature down, it runs the AC and turns the fan up in an attempt to cool the car down, but blasts out very hot air. As we are just coming in to summer in this part of the world, it isn't very pleasant!!

 

Is there a common fault that causes this?

Probably the loop on the end of the cable that controls the valve opening on the heater has come undone. A bit of a pain to get to, but if the end isn't broken off, it's an easy fix.

Yeah that sounds feasible..... What side of the heater box is that on? After having a quick look, I can see waht I think is the duct/mode control linkages on the right (drivers side in my case) side, but the temperature control linkage doesn't seem to be visible?

Passenger side.