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1990 300SE, 1987 190E 2.3
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172 Posts
Discussion Starter #1
Seems really low to me. Also, it never gets to 80 and it takes more than 10 minutes for the temp gauge to move when i warm it up in the morning.
 

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W126 420SE & W126 300SE
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389 Posts
No, thats way too low. Should be a good bit over 80. Obviously it will take a bit longer in the winter time but I think getting a new thermostat might be a good first step.
 

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1990 300SE, 1987 190E 2.3
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172 Posts
Discussion Starter #3
That's what I was thinking. Just thought I would ask first. That picture was taken about half an hour after the first start of the day after i got to work.
 

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1988 Mercedes Benz 420SEL 258,000 miles (SOLD) 1991 300se 168,000 miles, ASR 1999 GMC Yukon 192,000
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1,376 Posts
our 300se usually stays very hot which im told is normal, you r lookin way to low
 

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1991 300SEL
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212 Posts
Yup, most likely the T-Stat is stuck open, or broken.

I see your 150k on the odometer :thumbsup:

About to turnover that 140k mark over here.. keep on rolling!
 

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78 280S, 81 300SD, 82 300D, 92 300E 2.6, 90 260SE, 94 S280, 10 E300,
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900 Posts
My 260SE's temperature usually hovers between 80c and the white line above it.
 

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497 Posts
That is where mine is running, and the wife is complaining of no heat. Car has about 100k on the odo. I do wonder if someone pulled the thermostat to guard against a blown headgasket, but I have not checked.
 

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90 560sec, 90 560sel, 92 500sl, 94 e420, 13 e350
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284 Posts
This is about the same on my 560sel, just did not get the chance to check it plus really did not drive the car that much. I do get heat though.
 

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'73 450SL, '83 300CD, '01 E320 4matic
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2,446 Posts
The thermostat is 87C, I believe- mine does not deviate from that unless I'm sitting in traffic for a very long time, or I shut it off and restart it within a short time.

If the line above 80 is 100, then halfway in between 80 and 100 should be 90, mine sits just below halfway between 80 and 100.
 

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1990 300SE, 1987 190E 2.3
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172 Posts
Discussion Starter #11
That is where mine is running, and the wife is complaining of no heat. Car has about 100k on the odo. I do wonder if someone pulled the thermostat to guard against a blown headgasket, but I have not checked.
What do you mean by "guard against a blown head gasket"? Is it possible to stop a head gasket leak by pulling the thermostat?
 

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1991 300SE W126 Collector owned, maintained 90k mi
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177 Posts
Pulling a Tstat wil not lower the possibility of blowing the gasket. It's important to keep the Tstat in to maintain an "operating window" (temp) for the ECU.
 

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1990 300SE, 1987 190E 2.3
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172 Posts
Discussion Starter #13
Pulling a Tstat wil not lower the possibility of blowing the gasket. It's important to keep the Tstat in to maintain an "operating window" (temp) for the ECU.
I only ask because i have not looked yet and i was afraid that if i found no thermostat putting one in could cause the head gasket to start leaking.
 

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497 Posts
Do not think pulling the tstat would prevent a blown headgasket (as the go due to a design defect), unless one was worried about the thermostat sticking and causing the car to overheat. Just listed it as a possibility due to the crazy troubleshooting I have seen on this car.
 
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