2001 GMC Yukon XL

Replacing parts just to replace them wont fix a bad wire or part. Better to use a voltmeter and ohn meter to check if your getting power to the wires. You may have a bad connection or bad switch on the column for the pumps. Without checking the circuits it will behard to tell what it is thats wrong. Find a wiring diagram and trace the wires and components.

There is a electric motor that pumps washer fluid . Located in the bottom of the washer fluid tank .
Wash Operation (Front and Rear Wipers)
The front and rear washer systems use the same windshield washer fluid pump. When either the front or rear wiper is in the washer position voltage will be supplied to one side of the windshield washer fluid pump (depending on whether it is front or rear), while the other side of the pump is grounded.
At this point, the windshield washer fluid pump sprays solvent onto the windshield. When the front or rear washer is activated, the BCM receives an input from the switch that is activated. The BCM will control the wipers while in the WASH mode. The BCM will control either the front wiper relay or the rear wiper relay to turn on the wipers. The windshield wipers operate at low speed for 3 swipes and returns to the park position.

When turning on the washers do you hear the motor run ? Have some one try it while you listen at the washer fluid tank ! These pump motors do go bad .
turn OFF the ignition.
Disconnect the harness electrical connector of the windshield washer fluid pump.
Connect a test lamp from the windshield washer pump control circuit to a good ground .
Turn ON the ignition, with the engine OFF.
Press the front washer switch.
Does the test lamp illuminate?
YES or NO !

Turkey baster or unplug hose under fill tank and drain.

wiper motor bad washer pump is part of wiper motor you pick a good one up at a junk yard for around $35.00

Windshield Wiper Motor
Removal & Installation
To Remove:

1. Remove wiper arms.
   
2. Remove weatherstrip from cowl.
   
3. Remove two cowl vent grille panel screws.
   
4. Remove windshield nozzles and hoses.
   
5. Remove three cowl vent grille panels.
   
6. Disconnect windshield wiper motor electrical connector.
   NOTE: Do not remove crank arm from windshield wiper motor.
   
   
7. Loosen nuts that attach the drive link brackets to the crank arm.
   
8. Remove wiper motor crank arm brackets.
   
   
   
   
   
   
   
   
   
   
   
9. Remove three bolts and windshield wiper motor from vehicle.

To Install:

1. Install windshield wiper motor and three bolts.
   
   
   
   • Torque to: 62 in lbs. (7 Nm)
   
   
2. With right side linkage closest to the windshield wiper motor, install drive
   link brackets to wiper motor crank arm.
   
   
   
   • Torque nuts to: 44 in lbs. (5 Nm)
   
   
3. Connect electrical connector.
   
4. Install nozzles and windshield washer hoses to cowl vent grille.
   
5. Install three cowl vent grille panels and screws to vehicle.
   
6. Install weatherstrip to cowl.
   
7. Install wiper arms.

If you keep going to the same dealer to get this repaired and it keeps coming apart I would find a different dealer to repair the problem. I certainly wouldn't be paying them repeatedly for the same repair.It most likely attaches to a connection on the wiper itself. The only reason for it to keep disconnecting itself is the line is too short or someone is messing with you. Without looking at the connection itself I can only recommend that you get the Haynes repair Manual for your vehicle. This will show you the connection and how to properly route the connection so this problem doesn't persist. It won't cost as much as having the Shop repair it repeatedly.

check the nozzle by putting a needle into it to make sure it is not clogged up. check hose for leak. pump may not be strong enough to get the fluid there

probably is the washer tank if the hose is not disconnected

do you hear the pump run? if not check for power at the pump when pushing washer button, if no power the "wiper circuit board" may be bad.

left fender on the washer fluid bottle.