Rick7340, did you get help on this one? I also have been having the same problems. I live in Guam so we get 365 days of sunshine and I always put my a/c on about 70-75 degrees in auto but a few times now it would just get hot all of a sudden. After a few minutes it would go back to cold. Weird. Now I select the vents, temp to 60, and fan on manual mode and once in a while it would just all of a sudden get hot again. And I mean HOT like the temp was changed to 80-85 degrees! After a few minutes or if I shut the Z off and turn it on again then its fine.
Does other Z's out there have the same problem? Please help find the culprit.