because the blower motor is no good, for some reason it get damp in the blower motor chamber, and slowly the speeds start to go one by one until you just have high.
The blower motor speed resistor is burned out. The high speed function bypasses the resistor. The speed resistor is generally located near to the blower motor.
The resitors or contacts to the resistors have quit. Start at the switch, check continuity/resistance on the input and output for each speed.
if your blower is working on low and medium speed then it's not a fuse it is the blower switch
The 25 amp fuse in the buse block protects the blower circuit. If the high speed blower speed is lost, check the four pin plug C516 behind the right valve cover. This contector will eventually corrode producing a loss of continuity and lost of the High Speed Blower speed.
The blower motor speed resistor is burned out.
9006 for the low beam 9005 for the high beam
9006 for the low beam, 9005 for the high beam
Blower motor control?
If you have no blower speeds at all, first check the fuse. If the fuse is okay I would suspect the blower speed switch and its electrical plug has melted. If the switch checks okay I would suspect the blower motor is bad. If you have high speed only, I would replace the blower motor speed resistor. If you have all lower blower speeds but no high speed, replace the high speed relay.
either the blower control switch or the blower motoer needs replacing
The blower motor fuse protects the blower motor electrical circuit. The blower motor relay operates only the high speed function of the blower motor. The blower motor speed resistor operates the lower speed functions of the blower motor.
It would have a high speed relay and it would be in the power distribution box under the hood. The blower speed resister is for the lower speeds only.