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Q: Rear Window wiper, I cannot locate a check valve that is in the washer line. on 2000 Mercedes-Benz ML55 AMG

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Rear washer stopped working, washer pump at reservoir
is working and will pump fluid, line appears to be plugged, tried low air pressure in line up to 50 Psi. Found parts schematic which shows check valve in line but does not give any indication where it is located. Dealer said they did not know but would attempt to repair for $ 90 / hour. Said it might cost $ 500.00 + and would not quote ultimate cost.
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MOST OF THESE PLUG AT NOZZLE PULL LINE OFF REAR WIPER AND SEE IF YOU HAVE FLUID COMING OUT OF HOSE IF SO NOZZLE IS PLUGGED
Thanks for the reply, yes I checked the rear nozzle, had to remove rear panel, nothing is coming out of open tubing, eventually put 50 psi of air on disconnected hose at washer pump with no air leaking at rear. Traced line it has no check valve visible goes through firewall, appears to go up pillar and disappears.
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