2000 elantra white smoke during speed, doesn't start

There are two fuses that cover the power windows, but if it is only one window, it is likely to be the switch, the wiring, or the motor on that particular door. An auto-electrician can diagnose. Videos may help.

Hyundai Elantra (XD; 2000-2006) fuses and relays

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The fuse box is located on the driver's side of the instrument panel behind the cover. The location of the fuses in the passenger compartment: Hyundai Elantra ( ...

a small rubber vacuum pipe connecting to the injector system / inlet manifold. Sometimes this pipe perishes and allows air to enter thus decreasing the vacuum. The engine then cuts out. It's simple to check and replace the tubing where necessary. You may also notice the engine cutting out when traveling at speed and one suddenly slows down.

Sounds like your speed sensor has gone out. it is located on the passenger side just under the spindle/hub assembly. it is about a $40.00 part. try a local junk yard those some times help out with parts that you can get really cheap that way you can also find out if it is the speed sensor itself. Also it is just under the half shaft. it is easy to get too with the car on jack stands and the right front wheel off the car. you might have to pull the brake assembly off.

I’m happy to help further over the phone at https://www.6ya.com/expert/dennis_7c5f8bf265aab5e9

The fan on the radiator, or the fan in the passenger compartment ?
The blower motor in the passenger compartment uses a resistor to change speed, you may have a faulty resistor or the blower motor itself.

It\'s the tranny fluid, it comes out the blue switch on the drives side of the tranny and then spays on the exhaust and then burns white smoke.
When bad, It will only do this at speeds of 60mph + most shops will never find it and it\'s a small amount of fluid so it doesn\'t show up low when check. They need to be looking under the car not under the hood.

Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop & owner manuals, service bulletins, campaigns, illustrations and procedures, etc

Your heater core has developed a leak (of coolant). The smell is the "sweet" smell of ethylene glycol,
a component of engine coolant. The white smoke is steam coming from the heated coolant evaporating.
The coolant is dripping into your duct work under the dashboard, and apparently being evaporated
out of the ductwork and sent into the passenger compartment, meaning its a small leak.
When the leak gets worse, you may get wet carpet on the front passenger side.

White smoke means that coolant gets into engine's combustion chamber.
Probably because of overheating and damaged gasket. Anyway disassembly
and inspection needed.

It sounds like the blower motor is out or has lost power. First, check the fuse. If that's okay, check the speed controller. The blower motor resistor pack/fan speed controller is in the engine compartment near the receiver drier at the passenger side rear of the engine compartment.