It's time for me to practise what I've been preaching. Today I started troubleshooting the ATC (Automatic Temperature Control) in the NYB. I've never actually ever repaired a non-functional unit before so this is a first for me. I moved the car outside to get more light and so I could run the engine without sucking exhaust. This is basically what I found: The Hot/Cold air door is stuck, well, it was. This was no doubt more water damage. I was able to free it somewhat but not enough. The servo itself moves this air door by way of a lever on top of the air box. http://www.nybclub.org/m&r/AutoTempDemoModel/image1.htm http://www.nybclub.org/m&r/AutoTempDemoModel/image2.htm http://www.nybclub.org/m&r/AutoTempDemoModel/image4.htm I am considering cutting an access door in the front of the air box to help me free this door. The "amplifier" was bad. I replaced it and things worked better so I guess that means it was bad. The amplifier is the little black box mounted to the extreme right end of the air box. http://www.nybclub.org/m&r/AutoTempDemoModel/image14.htm The blower motor started making horrible noises indicating bearing problems. I have a replacement I can use but by the look of it, those are not easy to change. The motor must be removed from under the hood and it is tucked down under the quarter panel. I hope I can remove it without removing the panel. http://www.nybclub.org/m&r/AutoTempDemoModel/image11.htm At least now I know what I am up against with the ATC. It was one of those big question marks all along. I think I got away lucky actually.