Does anyone know approximatly how often the SBC pump on a 2004 E320 wagon( 33K) should cycle on and off in normal in town driving? These pumps are under a 10 year warranty but I'm not sure if mine is cycling too often or not and would like a little more info before I call local MB....Thanks, Desert

Bring it in and they read out the running time. If it's longer than normal they will replace the pump if everything is normal.

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600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
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Thanks, it's due for a scheduled service in about a month so I'll bring up the pump issue with the Service Rep then but I was just trying to get a rough idea of how often it should cycle for my own knowlwdge. It just seems to be going on and off more often than it did before.If so, is this a sign that the pump is going bad and should be replaced? I always like to have an idea what is going on before I go to the dealer and so far, I have had some excellent input from this forum both on my E320 wagon and on my 85 280SL Euro......Desert