ANSWER:
The 1990's Cadillac Seville STS vehicles come with (2) independent blowers installed from the factory. The largest blower is the front blower. It is located in the center of the dash and can be accessed from the engine compartment. To remove it, you must cut the hard plastic/rubber shield holding it in place. (YES! You heard right, I said cut it.) It's designed by Cadillac to be removed this way. Cut along the dotted lines. Funny, yet true. With this blower out of commission, you can not get heat or defrosted/de-iced windows cleared. Won't happen.
The other blower is a smaller blower located between the driver/front passenger's seats just behind the gear shift housing. This is controlled by the rear passengers not the driver. This unit will not create enough heat to heat the car. It's heat/cold source is fed by the larger front main blower. Both work independent of the other. When one goes out the other works and vice versa.
It's close to the blower motor.
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The Cooling fan Fuse is Located above the driverside strut remove the whole plastic cover
when i changed the bm everything worked fine.$60 for the part.
If you have checked the blower motor and it does function when power is applied then I would suspect the Blower Motor Resistor Pack is defective. It is also possible the blower motor speed control is bad, but highly unlikely.
Just changed one out on a 2001 Seville. Normal indication is noise from the fan in the blower. Located behind the glove box, under the dash; remove the knee panel and glovebox insert. Replacement motor cost about 150.00. Make sure you get the delco OEM (autozone), a little spendy, but cheaper one doesn't fit! Trail and error. Down load removal instructions from the internet. Ed
By an auxiliary engine
The blower in most 90's Cadillac's indeed can be changed out however, you will need to cut along the lines as indicated in the plastic barrier found housing the blower motor itself. Odd as it is, you really do cut this plastic shield and remove the blower. I've done it twice and it works just fine. NOTE: It is not easy getting a new blower back in as it was getting the old one out. Just have a little patience, go slowly and turn the blower motor slowly as you put it in. (not the squirrel cage itself) but the motor housing. It seems to fit easier with a gentle turn as it drops into place.
A 1998 Cadillac Deville does not have a blower relay. The system has a fuse and a controller to feed power to the blower motor.
the impeller are the fan blades themselves.
The blower relay for the 1979 Cadillac is under the driver side of the dash. It is a plug in type and fits into the fuse box.
Blower motor speed resistors are generally located close to the blower motor.