The blower motor speed resistor is probably burned out.
The window will often fall down on a 2001 Nissan Xterra due to a faulty drive motor. This causes the tension that holds the window in place to release.
you need a new blower motor resistor
Defective Blower Motor Resistor Pack.
well... there are many different causes for vibrations. The most common cause for steering wheel vibration at high speed is poor wheel alignment.
There has been a recall on Nissan Xterra 98-03 that the fuel pump terminal on the fuel sending unit can develop a crack in the plastic molding. Thus causing corrosion causing the fuel pump to stop operation. This causes the engine not being able to start or causse the engine to stop running without warning, which can result in a crash. Call Nissan at 800-647-7261
If you are referring to the blower motor speed control, and you only have one speed, then the blower motor resistor pack is defective and must be replaced.
Check the resistance on the blower motor.
Common causes, blower motor resistor, blower motor, wiring or controls
Blower speed resister is burned out.
the blower fan resistor has gone bad.
If the blower runs on high it will get hot. If the blower is wearing out this will cause it to get to hot and blow.
Probably the blower motor, wiring to it or control switch