Firstly have someone operate the rear washer while you listen for motor operation at the front wheel well of the car (same side as the washer fluid reservoir).
If you can't hear the motor, then the motor is likely faulty and requires replacement.
You can operate the front washers to locate where both motors are. (under the car, beside the wheel well.)
If the motor is working but no water is coming out, then remove the rear washer jet and disconnect, then using a high pressure airline, blow backwards into the jet to clear out any blockage. If you don't have a high pressure airline with nozzle, then use something like the nylon filament from a yard brush to poke into the jet, to try and clear the blockage.
SOURCE: I cannot find the front window screen wiper pipes
if the nozzles are not on the hood, they may be in the wiper arms themselves, I have seen them under the vent grille at the bottom of the windshield as well, you should be able to see the hoses under the hood at the base of the windshield
SOURCE: no water comes out of my rear wiper it seems to leak in roof i have a class merz
Their is a rubber boot from the hatch to the body and no doubt its broke here but their is also a connection here as well so this could have pulled out ,if you cannot fix it from the rubber boot then its the head lining down iam afraid ,nice simple job if you have patience like most of these jobs but i personally havent done one as yet - - - yet being the adjective last one i done a few days ago was a volvo V40
SOURCE: The rear window wiper and window water spray will not turn off
This sounds like a bad switch, try dissconnecting the switch for the rear wipers and see if it stops if it does then replace the switch, the motor is pretty get and dry if it runs and the sprayers spray then it sounds like the switch is stuck or bad.start there,
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