C250 Diesel (1996) Coolant Loss

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Rangiawhia - 24 Jan 2005 22:30 GMT

No leaks obvious but some fluid top up necessary every few weeks. Maybe
leak is intermittent from somewhere in the plumbing. Contemplating a
coolant drain, flush and renewal as over 8 years (130,000 kms) this may
never have been done. Coolant temp rarely exceeds 90 level and have never
noticed or heard two electric fans operating either. Only cap in system is
on the ballast tank. No signs of pressure in the system as would be caused
by a head gasket problem but have noticed main top hose sucking flattish
as the engine cools. As with all things Mercedes a clue from another owner
could set the matter right at reasonable $$$$ impact! Can anyone out there
help on this one. Thanks

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T.G. Lambach - 25 Jan 2005 00:56 GMT

After you drain the old coolant, flush and renew the coolant install a
new pressure cap on the tank. Be sure the new cap is the correct
specification for the car.

The new cap should end the collapsing hose syndrome and prevent coolant
loss.

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Martin Joseph - 25 Jan 2005 19:26 GMT

> No leaks obvious but some fluid top up necessary every few weeks. Maybe
> leak is intermittent from somewhere in the plumbing. Contemplating a
[quoted text clipped - 6 lines]
> could set the matter right at reasonable $$$$ impact! Can anyone out there
> help on this one. Thanks

Look on the front of the water pump where the pulley meets the pump.

If the bearing is getting loose this is a typical spot for a small
leak. as the pump is pretty warm too, this will cause the coolant to
evaporate rather then puddle...

Just a thought.
Marty

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Rangiawhia - 02 Feb 2005 08:28 GMT

Many thanks for your help. The new radiator cap has done the trick. No more
collapsing hose and coolant loss. Plan to renew the coolant as well.

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