Bad switch in the new module and loose wire/connection that you corrected during the swap..?
Thanks for the welcome, Z66 BUTCH, and thanks for the input, FlaBouy. I can't figure it: the original module just quit working (no loose wires that I noticed) and is working fine now and
the new module I bought is the one that kept blowing even after I turn off the engine. Seems to me that the symptoms are pointing to something other than the module. I just don't know what it is. I'm not mechanically challenged, but I just blow stuff up for a living. Auto HVAC is something I don't have any experience with.