DIY OM642 thermostat replacement
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From: New Hampshire
'04 C320 4matic Wagon (sold),'15 E350 4Matic(sold),'14 E550 convertible,'20 GLC300
DIY OM642 thermostat replacement
Sorry about cross posting this question, but I forgot about the separate diesel forum. My ‘07 E320 bluetec is constantly running cold, no engine codes yet, but I think it may be time to replace the thermostat. Are there any guides, or even better, videos walking through this?
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Junior Member
Joined: Apr 2007
Posts: 61
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From: New Hampshire
'04 C320 4matic Wagon (sold),'15 E350 4Matic(sold),'14 E550 convertible,'20 GLC300
Shout out to Konigstiger for answering this. Link to my question in the W211 forum:
https://mbworld.org/forums/e-class-w...42-engine.html
Actually looks straight forward, very unMercedes like.
https://mbworld.org/forums/e-class-w...42-engine.html
Actually looks straight forward, very unMercedes like.
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Joined: Apr 2007
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From: New Hampshire
'04 C320 4matic Wagon (sold),'15 E350 4Matic(sold),'14 E550 convertible,'20 GLC300
Not sure but it’s listed as a thermostat. The Wahler unit I got runs about for about $150, the MB unit is over $200. From my limited research the “thermostat” does have some sort of heater in it to help the engine heat up faster I presume, diesels don’t like the cold.
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From: V E G A S
1922 Ford Model T / no OBD
Diesels have option for cabin electric heater, so I think the description is mistaking valve magnetic coil for heater? Lot of WIS have very strange names that come from "lost translation" . Typical is "pilot bushing" on 5sp or 606 have so-called fuel thermostat, what is fuel heater.
Point is that if it is electro-valve, your problem is more likely in controls, not in the valve.
Point is that if it is electro-valve, your problem is more likely in controls, not in the valve.
Last edited by kajtek1; Jan 8, 2018 at 11:43 AM.
Thread Starter
Junior Member
Joined: Apr 2007
Posts: 61
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From: New Hampshire
'04 C320 4matic Wagon (sold),'15 E350 4Matic(sold),'14 E550 convertible,'20 GLC300
Stupid iPad, posts disappear into the ether.
All I know is that the part is listed as a thermostat in multiple locations, be that as it may you are correct in stating that if there is a electro-mechanical valve there could be an issue with the controller. However, whether a control issue more likely than a bad valve on a 10+ year old car with 160k+ miles on it is debatable. Haven't installed the part yet, I will update this thread when the problem has been resolved.
All I know is that the part is listed as a thermostat in multiple locations, be that as it may you are correct in stating that if there is a electro-mechanical valve there could be an issue with the controller. However, whether a control issue more likely than a bad valve on a 10+ year old car with 160k+ miles on it is debatable. Haven't installed the part yet, I will update this thread when the problem has been resolved.
