Thanks for the comment, Raymond.

I've been using the ubiquitous blue washer fluid that's available everywhere and which I've been using for years in my wife's S211 2007 E350T without any problems. The pump is not running at all when the button is fully depressed, so I find it unlikely that the problem is due to clogging.

Can anyone point me to where I can find the fuse for the pump motor?

Best Regards,
Rob

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Robert Fini

'12 ML350 BlueTec, 87k
'06 E320CDI, 270k
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 69k
'97 C36AMG, 313k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)