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Old 10-25-2021, 05:47 AM   #1
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Sprinter engine buzzing during cold startup

Just noticed when the outside temperature is around freezing, my 2018 View Sprinter engine buzzes until the engine warms up. Cold hydraulic fluid is reasonable. Is this normal? Seems all is well after the engine is warmed up.

Doug in Wisconsin
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Old 10-28-2021, 04:44 AM   #2
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I think I may have a power steering fluid leak. Checked the dip stick and see nothing. I'm bringing the RV to Mercedes tomorrow. Will post outcome.
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Old 10-28-2021, 09:43 AM   #3
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Those commonly leak at the return line and it is a very easy fix, just order a new return line and some MB PS fluid. The line has a special shape where it attaches to the reservoir and once it fails no amount of tightening will stop the leak, only a new hose will stop it. In order to pinpoint, wash the whole area down and watch to see where fluid starts to appear. Driving with a dry pump will cause damage.
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Old 10-29-2021, 03:49 PM   #4
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I added about four ounces of ATF (auto transmission fluid) to fill up the tiny power steering reservoir. The buzzing stopped after I started with engine cold. Had it in to Mercedes, and they did find a few loose items (not sure what), and said I'm good to go. Lesson learned for me is to periodically check power steering fluid reservoir.
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Old 11-03-2021, 10:08 PM   #5
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And have a bottle of power steering fluid in the vehicle!
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Old 11-05-2021, 09:49 AM   #6
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And too, read your manual. Some use Automatic Tranny fluid, others, power steering fluid. I'd sure want to use what they say, but too, I'd put in the wrong oil to get home, rather than run it dry.
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Old 11-05-2021, 09:54 AM   #7
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Quote:
Originally Posted by Rick 99037 View Post
And too, read your manual. Some use Automatic Tranny fluid, others, power steering fluid. I'd sure want to use what they say, but too, I'd put in the wrong oil to get home, rather than run it dry.
Mercedes has always required Mercedes approved power steering fluid in all their vehicles AFAIK. That said I have heard of people using tranny fluid with no ill effects, but why? I'm not a risk taker and have only ever used Mercedes branded power steering fluid in my Mercedes vehicles, it's not that hard and it's not that expensive.
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