Thanks, but swapped leads long ago. That's not the prob. Prob. is sealed electronic component. Since it is some sort of a thermo unit, and epoxied, no idea of its internal components (resistors/capacitors/etc.). Because leads are not compatible with my application, indicates possiblility that this is the wrong part altogether. I worry that if unit is not the right one, will it damage its sister components, ie. in line blower, cpu, etc., and then I have bigger probs ? So, will my car blow up ? Been a couple of weeks, and ac/heat system seem to be working fine. Likely OK, and time to move on to leak in fuel/vapor recovery system.