3rd Oct 2011, 18:49
I had the same problem. My mechanic found the cause. It was one of two temperature sensors. He checked with Cadillac and all his suppliers. Nobody had them, and they did not make them any more. He showed me what to look for and what to cut off on an old Caddy at the junk yard. I found a 1989 at a junk yard 9 miles from my house. It's been three years and cost me $20.00. It works great. p.s. Three other good mechanics tried their luck.
10th Aug 2011, 10:31
I read your comment you made about the 1988 Cadillac DeVille A/C problems, and I have a 1988 Cadillac DeVille that is having the same problems. And I have done all of the same things that you have done, and it still switches to economy. I was wondering did you ever figure out the problem and how to fix it? If you could tell me I would really appreciate it. Just email me at undreward@yahoo.com