Same place you fill for the front washer fluid ! Your fronts work but not the rear ? There are to washer pump motors on the washer fluid bottle , one for the front an one for the back . Rubber hose goes all the way to the back . If that hose has failed ,to replace it you basically have to pull out your vehicles interior .
Rear Window Washer Hose Replacement - Pump to Endgate
Removal Procedure
- Remove the left front seat. Refer to Bucket Seat Replacement in Seats.
- Remove the rear seat. Refer to Rear Seat Replacement in Seats.
- Remove the endgate/liftgate door sill plate. Refer to Rear Floor Rear Trim Plate Replacement or Liftgate Door Sill Plate Replacement in Interior Trim.
- Remove the left front and left rear door sill plates. Refer to Door Sill Plate Replacement in Interior Trim.
- Remove the left body side trim panel. Refer to Body Side Trim Panel Replacement in Interior Trim.
- Remove the left hinge pillar trim panel. Refer to Body Hinge Pillar Trim Panel Replacement - Left Side in Interior Trim.
- Fold over the left side of the carpet to allow access to the body harness. Refer to Front Floor Mat/Carpet Replacement and Rear Floor Panel Carpet Replacement in Interior Trim.
Disconnect the washer hose connection (1) from the body harness (2) at the endgate. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
Disconnect the hose (1) from the rear washer pump. Install a plug to the rear washer pump nozzle to prevent washer fluid loss. Push the hose grommet (2) in through the bulkhead.
Pull the washer hose (1) into the vehicle though the bulkhead. Cut the old washer hose off where it enters the body wiring harness (2). Remove the hose end from the vehicle
Or it could be the pump , they go bad . switch the hoses from one pump to the other an see if you get washer fluid at the back ,if you do the pump is bad ,if not the hose or the spray nozzle is clogged . You probably will need to pull the washer fluid bottle to see both pumps
This is a 1990 190e in STUNNING condition, not a mark on the paint seats like new with only 57786 miles !! now comment......
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