Heater Motor Blower or Resistor?

The "really loud" and "funny smell" gives it away, the blower motor is shot. This is not uncommon on an older car and is a relatively inexpensive repair.

Expect to pay around $60 for the motor and another $100 or so for the labor to have it installed. If you do it yourself you can find the motor for around $40 and the labor of course consists of you sitting out in the cold trying to change it :)

The resistor pack can cause a funny smell but it's usually a short lived odor and is not accompanied by any "loud" noises coming from the motor housing.

Hope this helps!

Without knowing the Year Make and Model of your car, I would buy both. The Resistor is separate and is the reason it stopped working on different speed's, but the Blower Motor is the part that requires the power to spin and is the component that ultimately creates the heat in the wiring by pulling too much amperage when it's bad and frying the resistor.

If that funny smell is like antifreeze, then it is most likely your heater core. If the fans are working fine at all speeds, then the mortor and resistor is fine. That smell is a dead givaway(most of the time) of a heater core. Bad news: Expensive to fix. Probably near 400 bucks in labor and price varies on the core itself, depending of what you get.

run a 12+ wire to the motor, if it comes on then it's the resistor (potentiometer, riostat)

MOST LIKELY THE BLOWER MOTOR BUT I WOULD REPLACE THE RESISTER AS WELL WITH THAT MANY MILES.