M275 Thermostat 06 S600
Thread Starter
Junior Member
Joined: Jan 2019
Posts: 31
Likes: 4
From: Cambridge, Ontario, Canada
'06 W220 S600, '92 190e
M275 Thermostat 06 S600
Looking for options for replacement thermostats for this V12 other than replacing the entire housing/secondary air valve assembly.. I really would've thought there'd be a thermostat only option available. I have found the Dorman assembly which may end up being my solution if I don't come up with anything else.
Anyone had any experience with the Dorman part?
Thanks.
Anyone had any experience with the Dorman part?
Thanks.
Super Member
Joined: Sep 2012
Posts: 690
Likes: 76
From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
To my knowledge on the V12 you have to replace the complete assy - what's the problem with it?
The thermostat isn't just "slowly to open", but progressively opens different passages - you can probably look at it on a search for the V12 cooling system (complicated) schematic,
You can always try one from the wreckers.
BTW: even on my E350 it's an assembly., and was around $ 160.00.
BTW: What is the Dorman assy??
The thermostat isn't just "slowly to open", but progressively opens different passages - you can probably look at it on a search for the V12 cooling system (complicated) schematic,
You can always try one from the wreckers.
BTW: even on my E350 it's an assembly., and was around $ 160.00.
BTW: What is the Dorman assy??
Last edited by kraut56; Mar 4, 2019 at 01:12 PM.
Super Member
Joined: Sep 2012
Posts: 690
Likes: 76
From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
The most likely problem with these MB thermostats is that they run too cold, i.e. below 90 degrees C.
Running too hot is usually caused by defective fan control.
Running too hot is usually caused by defective fan control.
Thread Starter
Junior Member
Joined: Jan 2019
Posts: 31
Likes: 4
From: Cambridge, Ontario, Canada
'06 W220 S600, '92 190e
Thanks for the replies. I'm getting gauge wander while driving. Variable speed fan seems to work ok. No over heating. I'll compare the temperature sensor reading with a scanner and compare to actual engine temp using an infra-red thermometer before going down the thermostat path..
Thread Starter
Junior Member
Joined: Jan 2019
Posts: 31
Likes: 4
From: Cambridge, Ontario, Canada
'06 W220 S600, '92 190e
Under all driving conditions. Was slowly sweeping between 80 and about 115 degrees. Not cause for concern in it's self, but odd to me to see on a modern vehicle with a "plateau" type of regulated gauge. Don't these cars usually just stick the gauge to 95 degrees on the gauge? This car is new to me and I'm still in the process of sorting it out..
My manual says: "at temperatures between 95 and 115 degrees the gauge remains at 95 unless 116 degrees is reached and then the gauge will indicate actual engine temperature".
My manual says: "at temperatures between 95 and 115 degrees the gauge remains at 95 unless 116 degrees is reached and then the gauge will indicate actual engine temperature".
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