rich i dont know but something just doesnt sound right.i mean what if the system for the outside temp totally failed.does that mean you wouldnt get any cold air?right now iam having a bit of a tough time getting cold air from my ac.my outside temp is totally messed up and reads in excess of 130 degrees.the system in mb cars seems to be like a house with central heating and cooling much different that an american car.wouldnt the outside temp probe have an effect on heating also.i mean if it affects cooling it must affect heating right?iam totally confused now.some one who knows please tell me.