OK, I thought I would provide some information on my original post as I have discovered the gremlin. I started the morning at my local Ford parts department. I tried to identify the sensor, no luck, what year, whats the application, its really old...... So off to the junk yard, I found a 96 explorer, with an OHC and the sensor, 5 minutes later and $40.00 lighter, I headed home. It appears that the sensor I have is a early design, 96,97,98 maybe, definently changes after 98'. The sensor was located DS behind the valance at the bottom of the core support. Got home and installed the new sensor with the existing console in the truck, still 22* & Ice. Then pulled the existing OHC, and installed the one I just pulled from the 96' this morning, 82* & NO ICE. It appears that the board either just got tired or one of the resistors is bad. Swapped out the center section from the 96' was gray and installed it into the tan trimmed console. We are now back in business, there is definately a difference in resistance readings from the newer model explorers (ambient air temp sensor) and the early models. The boards are probably calibrated to the resistance of the sensors. I know that the new designed sensors have a completely different impeadence at the same temperature than the early style sensors. Hope this helps someone who has or will run across a similar problem.