The blower motor is running constantly until it kills the battery. This just happened after a really heavy rain. I'm not sure if something got shorted out or what. Any ideas why this fan would continuously run? Thanks.

 

Actually I think it is the cooling fan. It's one of the fans in the front of the car. It just runs until the battery drains. When I jump the car the fan cuts on right when I connect the jumper cables. Before I even start the engine.

Any thoughts?

 

Definitely sounds like an electrical problem unless your temperature sensor is completely haywire.

 

There is a thermoswitch B that controls engine off, radiator fan (pax side fan) operation. When engine-off coolant temp is hot enough, the switch closes and radiaotor fan runs for 15 mins to cool engine and protect head gasket/s. If switch fails closed, the fan will keep running until battery runs down. Unplug thermoswitch B (located on upper radiator hose engine side fitting housing). This should disable the radiator fan from running w/ engine off. New thermoswitch B should fix problem.

good luck