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Old 05-30-2010   #1 (permalink)
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Default coolant temperature for 350

Would appreciate some advice on this:

When on a long run my 350 has a coolant temp of around 90C sometimes a bit below. After reading the AMG coolant temp thread, out of interest i have been keeping an eye on this while starting up from cold and doing my commute of 7 miles or so one way.

On some days after about 7 -8 mins the bar crossed 80C. Sometimes it hovers about 80 and drops back and doesnt cross 80C even after 7 miles and about 20 mins of driving. Today it reached 80c after 10 miles and 21 min of driving but sometimes fell to about 60c and then climbed back up to 80c.

Is this worrying? I have often looked at this on long runs and it is steady at between 80-90 or at 90c and doesnt waver - atleast it didnt in my last long distance run.

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Old 05-30-2010   #2 (permalink)
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Hi Ram

Remember that the outside temp can make a differance to your coolant temp.
as last week was warm in the uk and this week aint the engine warm up time may be different over a short distance from day to day.

cheers pete
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not when you have a 350 MT it aint
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Old 05-30-2010   #3 (permalink)
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Sounds normal as the coolant temperature fluctuates esp. with different driving conditions, may be more fluctuations if it is in stop-and-go traffic. It tends to be more constant on freeway driving.

I mainly look at the engine oil temp in the SLK 55, as it needs to warm up to 80C before trying to go beyond 3000 rpm.
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Old 05-30-2010   #4 (permalink)
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90 degC is OK for coolant temp.

80 degF is a bit cool for oil temp... I think Eddy has his units mixed up...
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Old 05-30-2010   #5 (permalink)
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http://www.mbworld.org/forums/c-clas...emp-gauge.html

This seems to suggest a thermostat issue. A generic google search has hits from almost every car enthusiast forum and all of them seem to blame this thermostat.

Pete, could you check your coolant temp and how it behaves when you next do a cold start and drive please? Thanks
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Old 05-30-2010   #6 (permalink)
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Doesn't sound like a problem to me, stop start traffic is horrid for a proper check anyways.

Test on a long run with a similar load and similar ambient conditions.
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Old 05-30-2010   #7 (permalink)
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Quote:
Originally Posted by GeeJay View Post
80 degF is a bit cool for oil temp... I think Eddy has his units mixed up...
I stand corrected, post corrected to 80 degress Centigrade for oil temp.
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Old 05-30-2010   #8 (permalink)
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Quote:
Originally Posted by nakulan7 View Post
This seems to suggest a thermostat issue.
Agreed.

Thermostat should keep temp pretty constant, regardless of engine load or ambient temperature. That's its function. Warmup is supposed to be quick and fast.
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Old 05-30-2010   #9 (permalink)
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Hardly, they often fluctuate in stop-go traffic.

Thermostat opens at about the same time on every trip, the temperature is stable between 80-90 on every trip, so all we have is intermittent temp drops on one trip.

Not exactly conclusive, try getting that replaced under warranty.
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Old 05-31-2010   #10 (permalink)
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Just did a test this afternoon on the way home from work. Kept the coolant temp display on the MFD. Temp went from below 40C at start-up to 90C within 5 minutes of driving and stayed constant at 90C until I reached home.

Hope the above observation helps.
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Old 05-31-2010   #11 (permalink)
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Thanks for the replies.

Did a trip this morning - 13 miles, 30 minutes - ambien temp about 15C. The coolant temp hovered back and forth around 80C to reach 90c at end of journey.

3 hours later, retunr via a scenic route. Quickly reached around 90C and kept on wavering back and forth occassionally dropping to just below 80C and when i pulled into the drive was back to around 90c. Ambient temp 20C, 23 miles, 1 hour.

Is this thermostat. or is this coolant temp sensor?
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Old 05-31-2010   #12 (permalink)
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I shouldn't worry about it too much. Mine moves around a bit, but between 80 and 90 is all quite safe. I don't know how they regulate the instrument voltage in a Merc, but years ago there were some horrible Lucas regulators used on Rovers and Jaguars - and as often as not these were at fault in allowing the fuel and temperature gauges to fluctuate. I suspect a better electronic system is used today.
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Old 05-31-2010   #13 (permalink)
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I wouldn't bother about that, it's working OK.

It's an electronic thermostat remember and its regulation range is 80-100 degrees, if you notice that it can't keep itself in that range for the majority of the time then get it looked at but until then you will almost certainly be turned away with a no fault found.

Just FYI, a stuck stat will give you a CEL.
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Old 05-31-2010   #14 (permalink)
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How can you determine oil temp, is there a menu setting somewhere?
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Old 05-31-2010   #15 (permalink)
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Quote:
Originally Posted by madeinengland View Post
How can you determine oil temp, is there a menu setting somewhere?
This may not be available on the 2005 SLK 55. The cluster and menu/software in the SLK55 were changed later (but I forgot which model year).
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Old 05-31-2010   #16 (permalink)
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I think it's 07 and on, you can for about 600 get a new cluster and it will have the menu present.
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Old 05-31-2010   #17 (permalink)
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Wow 600 seems a lot, don't think I'm that bothered. I'll just guess !
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Old 05-31-2010   #18 (permalink)
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Yeah it aint' cheap, whole new cluster *chav on* innit *chav off*
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