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Cooling System, Top Up and Bleed
Caution
Use only anti-freeze 19 40 656 / 90 297 545 (blue) up to MY 2001
and only anti-freeze 19 40 650 / 09 914 431 (red) as of MY 2001 and
ensure a concentration of 50% water and 50% anti-freeze. The
purpose of anti-freeze is not only to protect the entire cooling
system against freezing but also to protect all coolant-affected
parts against corrosion and lime deposit. For this reason,
anti-freeze must be used even in tropical regions.
The water quality also plays an important role in addition to
the mix ratio. Water of drinkable quality usually meets these
requirements. The quality of purified sea water is inadequate!
Damage may also be caused to the engine if unauthorised
anti-freeze agent is used.
If radiator, cylinder head or cylinder head seal have been
replaced the old coolant must not be re-used.
Inspect
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Top up coolant to "KALT" (cold) mark (1) on coolant compensation
tank.
After closing the cooling system, let engine run warm until
thermostat opens (coolant temperature approx. 92 °C / 194
°F).
Cooling system bleeds automatically during engine warm-up
phase.
Allow engine to cool and check coolant level. If necessary, top
up coolant to mark "Kalt" (cold) in coolant compensation tank.
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