Please excuse me if this has already been covered...I have a 1992 400se , when either in economy mode or with the a/c on the 2 side dash vents will suddenly start to blow out the hottest air you can imagine. Its not all the time ,not when you first start up ,not even in traffic. I can be on the highway and the temp guage is in the lower half and it just does it. It does go away and then comes back again.
any ideas?