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look for blower motor. if not the case, the blower could just be broken. it can happen once the vehicle gets close to 10 years, but is usually preceded by a noise in the blower. most everything other than the blower, in the ac system, goes back to the mc unit.
in review
the fan speed resistor is new
you bench tested the blower motor
12 volts test ..only runs it at full speed
if cabin filer want changed the blower motor would run hotter
could be the motor brushes or bush/motor bearing when slowed
you might want to inspect the brushes and clean the dust out of the motor
if no better
does that have climate control ?
might be the fan switch itself or the earth isnt so good
Yes,could be your blower resistor is bad,it's right next to the blower motor,it controls the blower motor speed,easy to replace. Duralast Blower Motor Resistor Just took a guess at the model type since you didn't state,wow,high dollar price,guess it comes with a Mercedes,paid about 18 bucks for mine on my 85 Nissan.
Need to turn the glove box door upside down. To do this, there is a metal "S" shaped part in an opening on the left side of the glove box when open. Stick your finger in there and release this spring loaded metal piece, the door will now fall down. From the bottom, you need to remove the plastic kick guard below the glovebox to access from the bottom.
Horn and heater may be fuse related. The headrests have nothing to do with fuses. The switch is bad or going that way for the seat or the motors for the headrests are out.
The horn fuse spin it, or replace as corrosion from aluminum fuses cause problems. I suggest replacing them all with new copper barrel fuses. The blower motor fan is a strip fuse on the driver side strut mount in a tootsie roll sized case.
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