My '98 Mountaineer has issues with the automatic climate control. Some time back, the heater fan started working intermittantly. Then it stopped entirely. I could still change the temp settings and choose between vent, floor, AC, etc. I tried replacing the fan control module (replacing the fan resistor pack has always been the fix to a non-operating fan in the past), but to no avail. While driving out to Las Vegas for the SEMA show, the climate control system started working in a random fashion - occasionally blowing cold air when the temp set high, blowing hot air when set cold, mixing up the dash vent for the floor, once it even turned the fan on (that was short lived). The best guess I have is the that the automatic climate control unit in the dash has gone wonky. After the show, I drove up to visit family in the Bay area (where I am now). This morning, I pulled a replacement from a junkyard, only to find that it didn't work at all; it did nothing when I plugged in and powered it. I brought it back and came away with the only other unit I could find there. Unfortunately, that one alos doesn't work, and now, the original one doesn't work at all anymore either. So now I have no heating/cooling function whatsoever. Or defrost, which of bigger concern to me now that winter is coming back home. Are the climate control modules in these fragile? Is this a common problem with a ready fix? Can I swap in the manual AC control module (it looked like the harness plugs were entirely different). Thanks.