204 220cdi 2009 Sport (Temperature)

[OscarOzze]

While driving on motorway the temp gauge doesn't move above 60c , when in traffic goes to normal around 90 when hit motorway goes back to 60. Is that normal? [emoji849]

Sent from my iPhone using Tapatalk

 

[Stardelta]

Thermostat needs replacing, common fault but fairly easy to do, think the part from mercedes is around 75 pounds with a litre of antifreeze.

 

[OscarOzze]

Well if i change thermostat will it need a new coolant aswell?


Sent from my iPhone using Tapatalk

 

[Stardelta]

You only lose about half a litre when replacing thermostat, just buy a 1 litre bottle of mercedes antifreeze and top back up when job is complete

 

[Stardelta]

Tools required are torx sockets, oil filter socket as filter housing is in the way of the thermostat

 

[gIzzE]

Worth doing as your car uses the temp gauge to know fuel mix, think old fashioned choke.

Only hitting 60ºc on motorways it may be overfuelling by 20%.

 

[dan1w]

Just changed mine on the W211 after same symptoms, fuel economy went from 43 to 51mpg for my commute. Even managed 55 today babying it.