C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Topping off coolant every 3 months.

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Old 07-25-2014, 11:42 AM
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2007 c280
Topping off coolant every 3 months.

Is this normal to throw the HU code for more coolant every 3 months? I put about half a cup in the res and the code goes away. Is this to be expected in summer?

Do I have an overly sensitive sensor?

Old 07-25-2014, 04:39 PM
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VVF
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2005 C230K(sold), Mk7 Jetta
You probably have a slow leak somewhere I would guess...
Is the level almost up to the black tab inside the tank when it throws the code?
I saw in winter the coolant level goes down, but in summer it kinda should expand.
Old 07-26-2014, 04:34 PM
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2005 C230K(sold), Mk7 Jetta
Might be this: https://mbworld.org/forums/c-class-w...nd-source.html
I just found that mine is leaking too... Apparently not at the stage when it loses a lot of coolant, but was a couple oz's low. Crap, there goes another $50

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