I have a 91 Chevy Caprice the driver's door do I hook up the motor to the door first or connect the window /regulator up?

There is a fuse or a circuit breaker for power ! But it powers all the windows . If just the driver side doesn't work the switch or the motor or the window regulator is bad ! Do the other windows work from the driver door switch !

Would seem your into the inner doors & have a partial
grasp on things

Now you fix all door windows one shot

#1 Test all switches,ohm meter unplugged or volt meter with power
#2 Test all motors with battery voltage direct -- DC motor will run either direction-- can't hook up wrong
#3 Window Regulators -you know about them (Unless they are broken-you said they are tight)
#4 Do you have good ground side wiring & battery voltage at all
switches & motors
#5 Last resort--unhook the cables & work on freeing up the
glass & window guides etc then you will have found out if the
regulators are the issue

Click the link below:-----Door Panel Removal?

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How to remove the door panel to install a new window regulator?
http://howtobyme.blogspot.com/2011/08/how-to-remove-door-panel-to-install-new.html

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Hummer H2 Door Panel Removal? http://technoanswers.blogspot.in/2012/07/hummer-h2-door-panel-removal.html Hummer H2: How to remove Front Door panel? http://www.howtobyme.blogspot.com/2012/07/hummer-h2-how-to-remove-front-door.html 2009 Hummer H2 Door Panel Removal http://schematicsdiagram.blogspot.in/2012/07/2009-hummer-h2-door-panel-removal.html

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how to remove window motor on driver side door panel?
http://technoanswers.blogspot.com/2011/08/how-to-remove-window-motor-on-driver.html

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ford explorer window motor, regulator and door panel removal?
http://technoanswers.blogspot.com/2011/02/ford-explorer-window-motor-regulator.html

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Keep updated for more help.

most times this is repaired by replacement of the drivers door power window control switch panel located in the drivers door panel(the one that you push to open/close windows etc.

You can take something to wedge the window up so you can align everything

DON'T TRY. REPLACE ALL CABLES BECAUSE IT WILL CAUSE ALTERNATOR NOISE ON YOUR CAR AUDIO SYSTEM- IT WAS SPECIFICALLY DESIGNED TO THE ORIGINAL SET AND DOESN'T WORK FINE WITH OTHER. DO NOT ASK MY HOW I kNOW THIS

Sounds like you will need to replace the power window regulator in the driver's side door.

REPLACE SIDE WINDOW MOTOR CAVALIER
Power Window Repair for 2000 2005 Chevy Cavalier 4 door

I have a 91 Caprice with the same problem. I live in Atlanta, GA. and I could not find any autoparts store selling these pieces. I eventually found them at www.clipsandfasteners.com
The part number is : A20424 GM Front Window Guides 1 13/16 total length. They come in a box of 5 pieces. Cost $4.92 for 5 pieces. I had to replace one on all of my windows. The piece is the same piece used on the back windows too. They are a trick to get in. You have do a little bending of the aluminum thing they slide into. In the end a big C-clamp works slick to get the regulator arm piece to pop into the nylon piece. Patience is needed.

from the radiator ? If that is the case, the other one goes to the thermostat housing outlet.