Cadillac 1999 DeVille
If the
front blower motor is not running with battery level power to it, you may have bad blower resistors which controls the speed of the motor.. Unfortunately the resistors are built-in the motor. You may have to replace the motor. If you remove the motor, you can recheck it by direct wiring power to it. OR you may have loose wires.
Also check the Heater and A/C Programmer module.
Here's some info I found from another posting.
Red is positive 12 volts coming from fuse of circuit breaker. The black wire is either the ground or the main hot wire going to the
blower motor (3 pin connection only), and the gray wire (if is is small in size) is a variable voltage coming from the body control module requesting speed for the
blower motor.The
blower control module varies voltage on the main wire going to the
blower motor, supposedly in accordance with the requested voltage from the body control module. Usually if all fuses are okay and present on the apprpriate wire of the
blower control module, the a
blower motor that will not run or stays running after the key is turned off is the fault of the
blower control module. If the
blower control module has failed the the cause must be determined (over amping
blower motor) or else new
blower control module may fail when powered up.Usually
blower control
modules have more than three wires. Usual connections are: B+ (battery voltage) GND (chassis or engine ground), two large wires going directly to
blower motor (can be any color, but are usually 10 guage in size), and an optional wire that reports voltage level back to the body control module.
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