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  #16  
Old 06-18-2009, 02:04 AM
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I don't know if it could also possibly be my fan clutch and fan? I did supply my car with the 606 clutch and 11 blade fan. Could they have influenced the new temperature?
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  #17  
Old 06-28-2009, 11:36 AM
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Quote:
Originally Posted by Actros617 View Post
as long is above 40 C and not above 90 C you should be fine...
This is not true, on either end of the spectrum (hor or cold). The t-stat controls the engine's minimum temperature, which is 80C. And it's perfectly safe up to 120C if the cooling system is in good working order.

The normal temps on the majority of OM60x engines would be between 85-105C, under 95% of operating conditions. Operating below 80C indicates something is wrong, either the t-stat or the gauge sender. Temps above 110C are also usually an indication of something in the system not working properly, often the t-stat, radiator, or fan clutch. With all new components it's nearly impossible to get the temps past 105C. BT, DT.


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  #18  
Old 06-28-2009, 11:37 AM
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Quote:
Originally Posted by Abadjay View Post
I don't know if it could also possibly be my fan clutch and fan? I did supply my car with the 606 clutch and 11 blade fan. Could they have influenced the new temperature?
No, it's not the fan or clutch. A very common problem is the gauge temp sender goes bad, they start reading lower than actual. My fixxer-upper 1987 300D has that problem right now, it reads 75C when I know it's more like 85C. A new sender is cheap, p/n 005-542-26-17, ten bucks for a new one. It's located approximately below the #2 injector, behind the injecton pump - tough to access. You need to drain the radiator before installing it. Now if you've already replaced this sensor... then yeah, try a new t-stat. But I'll almost guarantee that after you replace this sensor, your gauge starts reading 85C most of the time.


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Old 06-28-2009, 11:50 AM
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Oh yeah - this is a long shot, but make sure some idiot mechanic didn't drill four or five holes in your brand-new theromstat. That will allow the water pump to pull some coolant in from the radiator, possibly preventing the engine from reaching the proper operating temp.

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  #20  
Old 06-30-2009, 11:43 AM
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Well I have decided to get a thermostat at the dealer. My friend's cousin is a salesman there who held their only thermostat for me. I didn't ask what brand, but this is the dealer...they should know what best suits their vehicles right?

If this doesn't fix the MPG problem, then thankfully it's just one off my list.
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  #21  
Old 06-30-2009, 03:00 PM
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The dealer t-stat is the best option. If you look closely on the new t-stat, you may find it's marked Behr or Wahler, and if not, it will probably be visually identical to one of those. You have two separate problems... MPG and possibly cold temps, they may or may not be related. The new, unholy t-stat should help answer some questions after you get it installed.

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