David, there could be a number of problems there. You need to diagnose things separately... check all the vacuum pods with a MityVac as described in the first few posts of this thread, and then use the factory climate control service manual to test each of the various sensors in the system (
click here). It could be a flaky pushbutton unit, but it would be a shame to spend $$$ for a rebuilt unit and find out that's not the problem (BT, DT).