I finally was fortunate and lucky enough to join the Imperial owners club recently. The car has ATC which is somewhat complicated and problematic in nature.... Is there a “ATC” guru that can give me some guidance on the basic mechanics/theory as to how the system functions or operates properly? The controls work, I.E. the fan activates, but I believe I need a new “heater by pass valve”...is it normal to have the A/C compresor “engaged” at all times ? Thanks for reading and any suggestions.