Well, here's what I've got. Blower motor is OK (bench tested). ACC control appears to be sending correct signal to the blower regulator, ie. about 1.25v on low speed and about 7.66v on high speed. These are measured at the connector (yellow wire) on the firewall and at the terminal on the regulator module. The output to the blower (red wire) shows about 12.4 volts. Blue (which is the ground for the blower) wire is floating, ie. not grounded. If the blower speed is regulated by the module (which is dissapating a lot of heat) and the control is in the ground leg which is open, then I guess it's the module which is kaput!! What is this called in Fast Lane. Perhaps regulator switch? Steve, does this sound about right to you??