W220 S320 2000 yr. Coolant visit Workshop! Please help!!

[lukasborecki]

Dear Benz Drivers, im sure someone have been through simmilar problem already. I have 2000 S320 Petrol and ocasionally it displays coolant, Visit Workshop error! Now i have changed fan on heater matrix in may 2010, MAF sensor shortly after, my mechanic said its because errors were never cleared from ecu, however after he did it error came back,so i know its not the case. Also when error 'pops' ondisplay,engine temperature raises about 10 degree. it comes back to normal after mesage goes. also when message disappears it shows 0 malfunctions.... im really confused. Could it be a thermostat??? Regards Lukas

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[kevr7881]

I had a similar thing with my S320 Cdi W220. Check to see if the electric coolant fan is actually working. This is in front of the radiator in its own frame. It is a common problem. It should always be running when the air con is switched on, and runs at varied speeds depending on actual coolant temperature. Not a cheap part at circa £500 but you can fit it yourself with a little patience and gentle manoeuvring past the air con pipes. No need to drain anything, takes about an hour once you get the front under tray off. Good luck!