How due the 4 well swich work - 2000 Chevrolet Blazer

The blower motor is drawing to much power and has blown the resistor. As the motor build up too much resistance it will do that. That is due to the motor brushes and bearing failure. The impeller should turn freely. Sure it will work with direct power, but you do have a faulty motor. You need to replace the resistor and the motor at the same time to return it to normal operation.

this sounds like a fuse problem. In the owners manual( under fuses and relays) it will tell you which one it is. its probably a 10 or 15 amp fuse. try this first, and if not, let me know. hope this helps

The Transfer Case Control Module (TCCM) in this model year have been known to hang up, try pulling fuse #48 (4WD) in the rear fuse panel located under the left rear seat. Reinstall fuse and see if everything works OK, if not, you probably need to replace the TCCM.

Did you change the battery?

There are a couple of types of switches but lets assume you have a more common one. It will be located on the left side of the brake pedal shaft it is black with 4 wires in one connector and a seperate 2 wire connector above the 4 wire connector. The switch is easily removed if it is this style by pulling it down it has 2 clips one at the top and one that slides over the pedal shat the back of the switch has a rased hump tha slides into a recess on the upper pedal support bracket.Grab switch pull down and gently wiggle it if necessary.Remove 4 wire connector and 2 wire connector. Now you are holding the old switch and yor troubles have just started the after market replacement switches really **** get a real gm swich.If you look at the old swich at its bottom you will see a little foot sticking out of the base of the swich once the new swich is installed you must use the little foot to adjust the swich.If you do this wrong you will do dammage to your transmission.The two wires at the top of the swich go to the transmission torque converter clutch.when the brake lights are on the upper swich is off. When brake lights are off the swich will be on.Get new swich installed using this info and get a pro to help you adjust it.It should cost you only 35 bucks to get it set.Dealer shouldnt charge more than 30 bucks for switch.
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hi its sounds like your 4/f swich is stuck some time thay will get dirt in them tap on swich if dose ht heil need swich

there is a broken wire in the switch in the steering column. if you take the column cover off you should be able to see it. simply repair the broken wire and it will work perfect.

the rear switch is bad worse case the motors are bad but not likely try replacing the swich or the child safty swich is in the off pos...? turn the safty off use the back seat switch if this doesnt work replace the front switch

If you have a 4 door jimmy the rear door jamb swiches go bad. also check and clean the pin terminals at the jamb swich dconnector. This is a 2 pin terminal connector.

There is a relay that goes out on a lot of fords for the 4 w d .did you check that ?