The head control unit is the switch cluster mounted in the dash. The edge connector connected on the back side is numbered alphabetically a to n. n is +12v from the fuse box. To get +12v to the compressor clutch, the head control switch has to be set for either max, norm, or b/l. This should route +12v to the g finger on the edge connector. After removing the metal top cover I could see where a peice of etch between a bank of switches had disintegrated. A quick peice of wire soldered between the 2 points gave me +12v at the g finger. Cranked up the GT, and Whala!, compressor cycles. Now I'm off to Big Lots to get R134a ( $4 a can ). Still would like to know where the compressor relay is though. Anybody ever messed with one?
[This message has been edited by flimbob (edited 06-14-2008).]