Where is ac module located in 2000 cadillac deville

What is your question?

My a.c. doesn't work in car and was told a module is missing in the trunk but idk what is all in the trunk to know what is missing. Guy said compressor works. The heat works although some issue with door actuator but still heat and jist air. Need air conditioner as already hot

What makes this problem better or worse?

Same

How long has your 2000 Cadillac DeVille had this problem?

Months