W463 300 D running hot
Just had a similar problem - although mine is petrol so probably a completely different thing but check this as it has some good tips for checking if your fan coupling is OK.
http://www.gwoa.co.uk/content/300ge-running-bit-warm
Mine wasn't and I've just replaced it with a new one since when temperature guage sits exactly where it should - and today was a very warm day.
switch off the engine when hot and see whether you can rotate the fan by hand. if so, you may have a worn-out viscous coupling.
Which fan is 'on' do you have air-conditioning?
If you are referring to the main engine fan, then this will tend to rotate, but with not much force, until the temperature rises and the viscous coupling locks up.
...or do you mean 'top of the red' instead of 'blue' ?
try Rick on german ebay.de (g-ologe ebay name) he can supply you a smaller pulley (spins quicker) and a water pump with and a water pump with a bigger impeller
Hello,
If you can turn the fan by hand when the engine is hot, then the most likely problem is the viscous clutch. for the fan.
The part is available from Euro Car Parts and this post, in the link below, as highlighted by Mark, will tell you all you need to know to replace it:
http://www.gwoa.co.uk/content/300ge-running-bit-warm
In the end I gave up the idea of doing this job myself. There is very little room between the fan and the radiator so I was worried that I would either mess up the Allen bolt head or damage the radiator so left it to my garage to do when they did the annual service.
Very glad I did as they only charged me an extra £20 plus VAT so money well spent and knuckles saved.
http://www.ebay.de/itm/Mercedes-G-W460-W461-W463-Turbo-Diesel-Improvement-Kit-Verbesserte-Wasserpumpe-/161656376174?
If memory serves me right there are two temperature settings for thermostats available, which leads me on to ask which temperature setting did you fit? Is your vehicle over heating or just showing increased coolant temperature? Have you replenished with a 50:50 mixture of coolant when doing the thermostat change and as ever, I do not suppose the block was fully emptied when replenishing coolant on the last occasion.
Secondly, Arnie is correct in pointing you to look at the viscous fan but equally important to check is for Radiator blockage. I accept radiator blockage overheating would manifest in cooler climes but the warmer weather could be the right formula over heating to show up and in particular under load. Diesels' do have a temperature increase under load but as long as the reading does not top 120 degrees centigrade. That is not over heating.
To continue with the point I was trying to make is check out for any cool spots on the radiator after a good run. Switch off the engine and Carefully, with the back of your hand feel the whole surface of the radiator top to bottom and across the entire width to feel for any cool or cold spots. This would indicate blockage in that area of the radiator contributing to your issue. a warm radiator all across indicate a properly following radiator therefore no issue there.
It could if it didn't have a broken fan !!
I ditched the viscous fan years ago as I found the noise really irritating.
I've had a couple of diesel engines with failing head gaskets that haven't displayed the usual symptoms.
No side effects to running hot for that time? I hope you have another garage for future use!
What is the correct way to fit the stat? Mine is running hot as well and I have tried pretty much everything to resolve but without success?
Leo
Much appreciated thanks - mine too is the wrong way round
Leo