w210 slowly heating up e230 - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 09-08-2007, 12:57 AM Thread Starter
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Date registered: Sep 2007
Vehicle: w210 e230
Location: aberdeen
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w210 slowly heating up e230

hello to all, i have just joined this site, so if i have placed this in the wrong section, sorry
I have a MB e230 elegance 1997 140,000 mls it has run like a dream, but has just started to heat up slowly over the last week or two, it normaly sits at about 70 when siting in trafic at a stop its starts to creep up slowly up to 100 + if i was to let it, this is not a quick change but over 15 - 20 mins if not moving or going slow enough, but as soon as the car starts to move fast enough it gose back to approx 70 - 80 or lower on open road but not lower than 60.

it has a full service history when i bought it i have had it for 9 months now and plan to keep it for a long time to come, and has had a coolant flush by my self, it dose not use or loose water, and runs smoothly, i am thinking of just bying a new thermostat and start at that, to see if this will help.

has this happend to anyone out there any help would be appreciated
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post #2 of 4 (permalink) Old 09-08-2007, 09:34 AM
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Could be a number of things such as the radiator fan not coming on, thermostat not opening fully etc.
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post #3 of 4 (permalink) Old 09-08-2007, 12:12 PM
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Hi, Mark, and welcome to the forum.

Scroll down the main page and come join us in the W210 forum, it's specific to your model. There are lots of great members who can guide you on this (I've got a newer 210). That said, it may just be your fan clutch. If it only gets hot at slow speeds, in traffic, etc. and is fine at speed on the open road then that may well be your culprit. If it was the thermostat it would be warm all the time. The fan clutch is supposed to work at slower engine speeds and warmer temps, and release as engine revs rise so it doesn't drag power or cause extra noise. Once you're up to speed there is enough air passing through the radiator you don't need the fan.

Take care and enjoy the ride,

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #4 of 4 (permalink) Old 09-08-2007, 10:19 PM
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What do you think about the fact that the temperature goes as low as 70 (or even lower, he says "not lower than 60") when driving on an open road.

Something like this could happen on a diesel at extreme cold when the engine is too efficient to produce the heat required to keep the cabin warm. But this should not happen for a gasser at summer (I assume there is no Aberdeen in Australia, and even there it would not be cold enough).

To me it sounds like one option would a stuck thermostat.
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