Thanks Rod,
I located the temp. sensors, and swapped the d & P side, no effect on the system, still have heat on the pass. and working properly on the driver side.
I also was able to graph the DCCV and found, contrary to my last post, that both valves had "counts".
I also noticed that the DCCV made a "pop' or "click" type noise as it worked. I assume that the valves were opening and closing at this point, but still no effect on the problem.
I have not checked voltage to the DCCV or the DATC, as the graph shows that DATC is sending the command to the DCCV.
So, what's next ?
Bad "new" DCCV, or bad DATC ?
:runar ound:
I feel like I'm chasing my [tail] !