Where is the blower control module located on a 1996 cadillac deville

Most are mounted onto the case of the actual blower motor, but I have not pulled that specific blower. So I may be wrong.

Look online at parts stores for yours and then pull the blower to find it. I just looked it up at rockauto.com and yours is pricey, I would test it first or get one at junk yard.

With automatic climate control, it is in the programmer.

If manual its on the heater box as some call it, behind the glove box on top of the heater/air system and has a control rod going to it but I think yours in not manual as the site I looked at only show the electronic one for sale.