I have a 98 Catera. Whenever I turn on the air or heat the passenger side always seems to blow cold air, no matter if I adjust the temp. for 90 degrees. Even if I adjust the passenger dual control temp setting it still blows cold air, even though it reads 85 deg. The driver side and the rear work great, but the passenger side doesnt seem to react to anything and seems to blow cold all the time. What can be causing this? Thx.

did you ever hear anything about this? did you take it to the dealer and find anything out?

i'm having a very similar problem...posted here:

http://www.cadillacforums.com/forums/cadillac-catera-cimarron-forum/83884-anyone-have-c-temp-sensor-calibration.html