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  #11  
Old 01-24-2023, 08:39 PM
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A diesel engine doesn't produce as much heat to start with and could very well be completely cooled by the heater core as suggested, this makes it more important to have the proper thermostat with the smallest bypass hole. I have seen even gas engines not warm up properly because of a bypass hole being too large.
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  #12  
Old 01-27-2023, 10:43 AM
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I tried driving with the heater completely off, and indeed, the temperature is raising a bit faster even with slow grandma driving style, and more importantly, not dropping.
When i turn heater on, it drops immediately by around 5 and does not raise that easily.
So the stat is probably fine, and we can conclude that you were right about the heater. Wouldn't have imagined it can affect the engine temp that much.
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  #13  
Old 01-27-2023, 11:17 AM
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You can't assume the stat is fine, changing to the factory BMW as Clavorion suggested might help.
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  #14  
Old 01-27-2023, 11:38 AM
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Quote:
Originally Posted by 80stech View Post
You can't assume the stat is fine, changing to the factory BMW as Clavorion suggested might help.

I agree completely with this recommendation. Replace the cheap tstat when you can find time to do it. Remember that you engine actually uses more gas when it is colder, so it's actually costing you money if it is not heating up fast enough or getting up to normal temp.
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  #15  
Old 01-27-2023, 12:07 PM
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That would be ideal to replace it by an oem one in the future, meanwhile i'll stick with that one as it's not really a big issue.
Could it overconsume if too cold and rpms are stable? It's always a steady 700rpm (695/705) after the temp gets to 50 60.
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  #16  
Old 01-27-2023, 12:13 PM
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The DME injects less fuel when the motor temperature is hotter at any given throttle and RPM. This is because the fuel atomizes better and creates a more complete combustion. It won't affect the stability of the idle in any way.



This is why BMW and every other auto manufacturer tries to use higher-pressure coolant reservoir caps, because when you run the motor at higher temperatures it creates higher pressure in the coolant reservoir (because it is above boiling temperature inside the block). But a bad thermostat doesn't allow you to get up to operating temperature, and makes it take a lot longer to get there, which is why it can affect your gas mileage, especially if you tend to drive mostly shorter trips.
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  #17  
Old 01-27-2023, 12:18 PM
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Ok i see, thanks for the additional knowledge sharing.
I guess that's related to that "cold diesel smell" that you get when the engine is not completely warmed up and doesn't have a perfect combustion condition.
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