Stiff steering on 2009 C350? - Mercedes-Benz Forum
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#1 Old 01-03-2013, 05:02 PM
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Stiff steering on 2009 C350?

Hey guys,

I just brought my car into a 30k service and noticed the loaner car (C250) I was given was pretty easy to steer. My 2009 C350 seems to be a bit stiffer. Anyone know what may be the issue?

I know the power steering flush was not done at 20k and the balance and alignment hasn't been done yet on tires that are almost 10k. The engine coolant flush hasn't been done yet either, everything else is as per the maintenance schedule.

Thank you in advance!
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#2 Old 01-05-2013, 01:11 AM
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Wheel alignment is very important on these cars and should be done if any unusual tyre wear is seen. Also make sure the fault codes are read out as there may be a problem with the power steering valve.

ERIC
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#3 Old 01-05-2013, 02:23 PM
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I just got my wheel alignment done a few minutes ago but the car didn't feel any different. I know it had new tires put on it like 9k miles ago but haven't done anything with the tires since other than just putting air in when needed. There aren't any fault codes or anything.

It's at 30k miles, are the power steering flush and engine coolant replacement necessary?
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#4 Old 01-06-2013, 03:21 AM
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Coolant is only changed if the specific gravity is low but most coolants will last 10 years or more and has nothing to do with the steering. Steering fluid will depend on how contaminated it is, if at all. We rarely change this fluid and I do not think it will help with the stiff steering unless it has the wrong fluid in there.

Best to get a Benz Tech to road test the car and give you his assessment of this situation.

ERIC
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#5 Old 01-06-2013, 08:19 AM
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Thanks! I wonder why they recommend replacing engine coolant every 3yrs or 30k and the power steering flush every 2yrs or 20k then?
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#6 Old 01-06-2013, 08:23 AM
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Originally Posted by prince View Post
Thanks! I wonder why they recommend replacing engine coolant every 3yrs or 30k and the power steering flush every 2yrs or 20k then?
Because they like making money, your money.

ERIC

Last edited by eric242340; 01-06-2013 at 09:35 AM.
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#7 Old 01-06-2013, 09:26 AM
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Originally Posted by eric242340 View Post
Because the like making money, your money.
Haha thanks!! I think you were right about the wheel alignment. Driving again last night I noticed it feeling better. Not sure why I didn't notice right after getting the car back in the afternoon.
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#8 Old 01-06-2013, 10:43 AM
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Are there any tell tale signs of when I would need the PS flush and to replace the engine coolant before it gets serious? I'm not a car tech by any means so all I could know is by reading the instruments off my dash.
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#9 Old 01-06-2013, 06:59 PM
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You would not be able to tell, the coolant needs a small instrument that measures Specific Gravity and the PS fluid needs an experienced eye.

ERIC
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#10 Old 01-07-2013, 10:10 AM
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The cache 22 then is if I take it anywhere they will more than likely say I need to change it and want me to pay them to change it even if there isn't anything wrong. Hmm...
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