I upgraded this question, because I have the exact same problem on my car. I lost AC last year, and this week had to replace the water pump, after I noticed that the fans aren't turning on at all when you put on the AC and it eventually led to a broken water pump impeller. My car is a 1998 Mercury Sable LS DOHC. I tested the plug going to one of the fans, and with the AC on, I couldn't get any voltage or amperage to the fan itself. I believe both fans work, though they are a pain to even attempt removal, let alone test.
What is the relays for this car, as lat's car has a different box diagram than mine. Oh and the radio loses sound when I put it in reverse. That might also be an issue.
Wednesday, July 4th, 2012 AT 6:09 PM