Mysterious A/C gremlin

[judith Nance]

Dash A/C control module lights up/turns off by itself. A/C heat works GREAT WHEN LIGHT IS ON MODULE, BUT INOPERATIVE WHEN UNLIT.  Shop diagnosed that a/c 7 HEATER CONTROL MODULE P/N 19153504 is bad an unobtainable.LE?  ANY HELP WOULD BE APPRECIATED!!!!!  ANYONE HAVE A SPARE ONE FOR SALE?

[jman093]

Might check salvage yards or car-part.com for a good used one.