I have a 97 caddy eldorado ,the air cond.and heater blower on 1997 Cadillac Eldorado

the air cond.and heater blower motor comes on while no one is around and runs the battery down,what is wrong with it

2 answers
could be a number of electrical issues,seek diag for the pwr draw from your mech. could be shorted resistor for blower motor
Also blower relay may be defective!