Question about 1991 Mercedes-Benz 300 Diesel

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Oil in header tank in my 300T mercedes - 1991 Mercedes-Benz 300 Diesel

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If you meen expansion tank hurry up change head gasket.

Posted on Jun 15, 2009

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Posted on Jan 02, 2017

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1 Answer

Why does my Mini's fan stay running for 20 minutes after engine is switched off & header tank from radiator needs topping up every week?


will assume it the newer mini produced


yes 20 minutes is too long

will need to go to a workshop for inspection
possible answers for the issue

the fan .......all fixable
faulty internal thermostat ..
faulty thermostatic temp switch not switching off
of fan motor not spinning quick enough


the fan thermostatic on /off switch is set that way to cool down the motor and not warp the head or block
after stopping the engine the coolant is at is hottest for a short time
so the fan shuts off when the coolest temp of coolant is reached

header tank needing top ups

check for hose leaks at clamps or small cracks in heater hoses
the cap of the header tank may need replacing
the internal heater radiator may have a leak
(you would have wet carpet inside the car)
a welsh plug may be leaking
radiator may have a hole hole
or other coolant leak unknown

worst case
if the coolant in the header tank looks like it is sludgy
(has oil in it ) or oil dip stick has coolant or water with the oil
there is a possibility the head gasket has blown

mini cooper
thermostat housing one part

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Oct 14, 2016 | 2006 Mini One

1 Answer

Found oil in header tank


Sounds like head gasket is blown and will need replacing

Sep 07, 2016 | Cars & Trucks

1 Answer

Oil in the header tank on peugeot 406 2.0 hdi


check oil if it looks like a lite milkshake...blown headgasket

Dec 02, 2011 | Cars & Trucks

1 Answer

Light come on on dashboard lookks like radiator with a funnel on top.


the header tank needs topping up ,use only 50% antifreeze mix ,never pure water

May 17, 2011 | Mercedes-Benz SLK280 Cars & Trucks

1 Answer

Please tell me how to check my antifreeze level on my merecedes elegance


lift the bonnet and look for the header tank bottle unless its one of the new ones then its in the boot as the bonnet can only be opened by the dealer

Nov 29, 2010 | Mercedes-Benz 190-Class Cars & Trucks

3 Answers

Coolant light keeps coming on


It could be low on coolant,or air in the cooling system,or the coolant low sensor needs cleaning.

Jul 15, 2010 | 1999 Mercedes-Benz SLK

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