GM TRUCK Inoperative blower motor.
The blower motor on some 2007 - 2008 Chevy Silverado and GMC Sierra extended cab and crew cab models built before 4/1/08 may fail to operate. If the fuse is good and the circuit up to the motor has power, says GM, the motor has probably failed. Water intrusion is the likely villain. Installing an upgraded blower motor with a new-design moisture shield (Part No. 25973845) should prevent further trouble.