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Hi all! Still pretty new here. '13, S-550 Just got it about a month ago with 37k. 42 K now.
Anyway, learning etc here. Today I installed all for "sacrificial cam solenoid harnesses & 4 sensor harnesses". Along with air filters, oil change etc. As I had the cover off, noticed the 2nd coolant tank. Is this system separate from the main coolant system? If so, how often should that coolant be changed?
When I first got the car, I had the MBZ dealer do the trans filter/fluid and flush my main coolant. I didn't think or mention the other coolant. Figured they were connected, but I bet not.
not sure on servicing - but the system can rot out pipes (especially on the V12) and are often low or empty - its for a water cooled intercooler - it gives a more consistent boost temp allowing finer control on the engine map - yes too hot but consistent
e.g. air to air coolers are a joke - the temp varies from -10 to 250 C, whereas once warmed up the better one manages more constant boost temp around 100C
without the cooler boosted air can easily hit 350C rather than your NA cars 45 C (warmed via under bonnet temps) all the heat can cause knock, but keep it constant and the set up can be more easily optimised
OP ask your friendly service advisor at Mercedes to print a VMI for you. It will have everything ever done at all Mercedes dealerships in order; by miles. Next get a CarFax (the guys in sales will print it for you if you are on good terms with them). It will have detail of *many services performed elsewhere.
This will help. Otherwise just do as I always have and change every fluid in the car to establish a baseline.
Charge coolant is a PITA to bleed. Filling is best done via putting the charge cooling circuit into a vacuum to fill it.
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