Ed,

I am glad to know you got the cool air back. Yes, when AUTO being pressed the PBU sends a 12V voltage to compressor's electromagnetic clutch to engage the compressor.

I am a program manager leading a design team design server product for Compaq (now it becomes HP). Sometimes I will visit Houston Compaq headquarter to discuss product issues. In Taiwan I live just the half way between Taipei and Hsinzhu science park. Only 40 minutes drive to Taipei from my home. I was graduated from Chiao-Tung Univ. which sits right next to the science park.

To save precious storage space in this great site, let's talk personal things by email, OK!

I am happy I could help.

Charles from Taiwan