Engine Temp - Page 2 - Mercedes Benz SLK Forum
SLK R171 General Discussion SLK 200, SLK 280, SLK 300, SLK 350, SLK 55 AMG

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#21 Old 04-25-2012
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Quote:
Originally Posted by VincentSLK View Post
According to the owners manual for my 350 it says "if antifreeze additive is present in the correct concentration, the value displayed may rise to 120C under normal driving conditions. The coolant temperature may rise to the end of the temperature range at high outside temperatures and when you are driving on mountain roads."
I agree with you. That is what the manual says. Personally, I have never seen the coolant temperature to exceed 95C.
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#22 Old 04-25-2012
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Originally Posted by SamuraiSpirit View Post
I agree with you. That is what the manual says. Personally, I have never seen the coolant temperature to exceed 95C.
I wouldn't want to either 90C is where a car should be in my opinion and I would rather it stayed there!
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#23 Old 04-25-2012
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Ok, I stopped by one of the Indy MB dealers and spoke with an SA(just to be sure, that's ServiceAdvisor). He said in early versions(170 and early 171's, the outside temp probe worked with the ventilationsys, and if it wasn't working properly, could cause a CEL, but that the problem Jeff had was probably totally MAF related... so there IS a chance for a CEL to be caused by the ambient temp probe...

Is that ok Jeff

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#24 Old 04-25-2012
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#25 Old 04-25-2012
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I believe these are the Mercedes OBDII various temperature codes:

P0109 Intake Air Temperature Circuit Malfunction
P0111 Intake Air Temperature Circuit Range/Performance Problem
P0112 Intake Air Temperature Circuit Low Input
P0113 Intake Air Temperature Circuit High Input
P0114 Intake Air Temperature Circuit Intermittent
P0115 Engine Coolant Temperature Circuit Malfunction
P0116 Engine Coolant Temperature Circuit Range/Performance Problem
P0117 Engine Coolant Temperature Circuit Low Input
P0118 Engine Coolant Temperature Circuit High Input
P0119 Engine Coolant Temperature Circuit Intermittent

P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
P0126 Insufficient Coolant Temperature for Stable Operation

P0195 Engine Oil Temperature Sensor Malfunction
P0196 Engine Oil Temperature Sensor Range/Performance
P0197 Engine Oil Temperature Sensor Low
P0198 Engine Oil Temperature Sensor High
P0199 Engine Oil Temperature Sensor Intermittent

B1227 Outside temperature indicator temp sensor

There are also a series of fuel temperature codes.

Not sure if all these are applicable to all Mercedes models or not.

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#26 Old 04-26-2012
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Mine works normally between 95 - 100º C
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#27 Old 04-26-2012
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I believe the cooling system in the SLK55 is fairly robust. I also normally see a pretty steady 90o C.

It is interesting that from the service manual the thermostat doesn’t fully open until the coolant temperature is above 102 C.

Quote:
Cooling modes (thermostat).

By Pass Mode – (thermostat closed) when coolant temperature <87 C

Mixed Mode - (thermostat partially open) when coolant temperature >87 C and <102 C

Cooling Mode - (thermostat fully open) when coolant temperature >102 C
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#28 Old 04-27-2012
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out of interest does anyone know where the temperature sensor is located (on a 350) for the cooling system? I would have expected it would be after the coolant has passed through the engine and on the return side of the system, but I have a suspicion it might be before the engine.
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#29 Old 04-27-2012
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The coolant temperature sensor is located at the rear left cylinder head.

SLK 350 Temp Sensor.jpg
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#30 Old 04-27-2012
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Nice one - thanks!
perfectly located then, so my suspicion was totally wrong
It just seems very sensitive as the temperature can fluctuate up and down by a surprising amount in a short amount of time, I am used to seeing a solid 90C and it never really changing, but on my 350 is it's often up and down by 5 - 10C

Thanks again for the pic
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#31 Old 07-28-2012
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Can someone help me with this- my R170 during summer on straight drive the temp needle always at 100C then at traffic on 90C but when i turn off the engine at start again after 20min or 1 hour it was hard starting, i need to switch it off and start again. by the way i'm in abu dhabi the temp here during summer it reach up to 52-55C and my R170 was US version not GCC spec., (can you help me want i need to do or replace?)
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#32 Old 08-09-2012
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I like to recycle threads, and this seemed like as good a place as any.

I have a 2007 SLK 280. About 61,000 miles.

I was driving to work and got a "Message". The message was ONLY a picture of the temperature icon, with no accompanying text. I had been turning the A/C on and off periodically to clear inside windshield condensation.

According to the manual, that message indicates a malfunction in the fan.

I checked the coolant temperature on the MFD, and it was at about 90C, which I believe to be normal.

The message has not been available on three subsequent starts and short drives. Temperature has been solid on 90C. Goes there and stays there.

My mechanic tried to download codes, but none were available (this was not a full StarTech thing, just the handheld plug-it-in-under-the-dashboard thing).

Fan operates. Fan goes to higher speed when switching on the A/C. Temp stays consistent.

At this point, I'm thinking this incident was just a false-positive and everything is fine. I plan to just keep driving and monitoring the coolant temp pretty constantly. I'm not planning to change the fan until I get more indicators.

Any comments or advice would be very much appreciated.
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#33 Old 01-26-2013
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driving home last night it was -2 degs and the coolant temp reading didn't go above 50 !
The heater didn't get very hot either !
Any ideas ?????
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#34 Old 01-26-2013
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Quote:
Originally Posted by LaPastouda View Post
. . . . Any ideas ?????
Move somewhere warmer?

How long was your drive home, and how long had your car been standing before you headed off?



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#35 Old 01-26-2013
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If the temp doesnt rise above that after a few miles I would venture to say your thermostat is stuck open
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#36 Old 01-26-2013
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car was stood for 2 hours and it was a 1 1/2 hour journey home.
Is checking/removing the thermostat a DIY job ?
I'd have thought even with the thermostat stuck open, the engine would have got warmer than that ????
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#37 Old 01-26-2013
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With the thermostat stuck open temp will vary with outside temp and driving conditions but yes 50C would be reasonable.

The thermostat is there to get the engine up to temp quickly and keep it within the optimum operating temperature range.
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#38 Old 01-26-2013
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Quote:
Originally Posted by LaPastouda View Post
car was stood for 2 hours and it was a 1 1/2 hour journey home.
Is checking/removing the thermostat a DIY job ?
I'd have thought even with the thermostat stuck open, the engine would have got warmer than that ????
The thermostat stays shut until the the engine temp increases. if it stayed shut you would overheat rapidly Staying open means the coolant is circulating all the time and is not getting up to temperature. There is a thread in here about changing thermostats. But that would be my first guess. One way to tell is to start from cold and hold the top hose if it starts to warm up slowly its a sure bet the stat is open. It would normally stay cold until the temp in the engine is getting up to the correct temp. then the stat opens and you woud feel the hose get hot pretty quickly

50 is low an engine runs best as near boiling point as poss like around 80 degrees
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#39 Old 01-26-2013
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found this on another thread
http://www.youtube.com/watch?v=Oyobl...ature=youtu.be
looks easy enough so will be ordering another TS and giving it ago.
Where can I get the part No. from ?
and any suggestions as to where to get it from cheapest, shipped to France ?
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#40 Old 01-26-2013
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I doubt they would be expensive from an MB dealer
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