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post #1 of 363 (permalink) Old 05-15-2012, 01:27 PM Thread Starter
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Coolant loss dilemma

I serviced my 2009, 451 a few weeks and ago and topped off the radiator coolant level. Over a period of a week the car suddenly but slowly lost coolant and over heated.

For the purpose of this discussion, I donít want to get into the cause of coolant loss but instead discuss what should happen if a sudden loss of coolant occurs (i.e., a sudden hose burst while driving).

In my case, the engine lost coolant and overheated but never gave me an over temperature indication on the instrument cluster. Only when the coolant temperature sensor failed due to excessive heat in the head, did I get any indication that something was wrong with the engine. Unfortunately by then it was too late and severe damage occurred to the engine.

Now I would think that the coolant temperature sensor would indicated a problem if the coolant operating temperature was too low or too high but the sensor has to make contact with the coolant to get an accurate measurement. In this case however, the coolant stops making contact with the sensor so Iím assuming that some intermediate dry air temperature was probably measured so no trouble was seen by the sensor.

I realize that quite a few of you reading this already have a scan gauge II plugged into your OBDII port and can read coolant temperature but isnít that temperature coming from the same coolant temperature sensor that Iím currently having issues with?

I know that this is a very common single point failure on any car with a coolant system. As these coolant systems age, I expect a whole lot more engine failures in the future. I would think that Mercedes/Mitsubishi engineering would have a solution that would give some indication of a problem long before engine failure.

How about the 450ís? Have they experience coolant loss and engine failure in this same way?
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post #2 of 363 (permalink) Old 05-15-2012, 01:39 PM
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Unfortunately, yours is not the first one to do this.

It seems that in all the cases that "I" have read, they all said the same thing: the light did not come on until AFTER the damage had occurred !!

From what I've seen, MB is silent on this matter ..............

it had to happen to you.

I have changed my coolant to EVAN'S ZERO PRESSURE NPG+ Engine Cooling Systems



Wishing the best to you.
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post #3 of 363 (permalink) Old 05-15-2012, 02:02 PM
 
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The OLD VW's didn't have this problem...
It needs a Low Level alarm sensor in the Coolant Bottle... That would take care of everything. Showing you ~Low Level~Boil Over~Boil Out~ telling you to Stop RIGHT NOW...!!!
NOTE: We were driving along with the Kid in front of us in her Yaris... The Cel Rings, and its her telling us the warning light on the dash just came on...!!! I told her pull over right now... I opened her hood, and checked the Water & Oil, they were OK... We were good to go... I didn't care what the light was about after that... She has 47,000 on it. The Dealer put a New CAT in it No Charge, because it was a Emissions Device...<:-))
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post #4 of 363 (permalink) Old 05-15-2012, 02:04 PM
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Quote:
Originally Posted by Brabus007 View Post
The OLD VW's didn't have this problem...
Yea, all MY old VW's were AIR cooled
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post #5 of 363 (permalink) Old 05-15-2012, 03:07 PM
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450's have a temp gauge.
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post #6 of 363 (permalink) Old 05-15-2012, 03:14 PM
 
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It seems to me that the cause of the coolant loss would be of much interest to this forum. Do you know why it happened?
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post #7 of 363 (permalink) Old 05-15-2012, 03:41 PM
 
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was the hose rubbing against the chassis?
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post #8 of 363 (permalink) Old 05-15-2012, 04:15 PM
 
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Quote:
Originally Posted by chieftmc View Post
I have changed my coolant to EVAN'S ZERO PRESSURE NPG+ Engine Cooling Systems

Chief, the Evans products are indeed interesting, but depending upon what happened to the the original poster's cooling system to cause the catastrophic overheating, I'm not sure that having previously converted to NPG+ would necessarily have averted the disaster (if that's what you're implying) as it could still potentially have pumped itself dry enough to overheat.
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post #9 of 363 (permalink) Old 05-15-2012, 04:24 PM
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trfellows, what actions have you taken with MB in regards to your problem??
Understandably the idiot light gave no warning to the overheating and that issue has cropped up here on SCoA before... so not a lone case...
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post #10 of 363 (permalink) Old 05-15-2012, 05:23 PM
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I attended a recent webinar with a smart tech guy. He stated that the coolant temp. light will come on at 244 deg. F. He also stated that the head gasket will fail at 248 deg. F. He did not elaborate, but I believe that the coolant sensor will only work if it is sensing liquid? If the system is empty, you will not see a warning light. smart needs to install a low coolant warning light and a coolant temperature guage and hopefully assist the owners who have damaged an engine due to coolant loss. The hoses, seperntine fan belt, water pump and thermostat should all be good from 2008 to present and smart should stand behind any failures with a good faith warranty.
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