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Old 12-11-2018, 03:13 AM   #1
Huzzy
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E46 320CD overcooling

Hi everyone, i have an e46 diesel, my car used to get up to temp and then cool once on the motorway. I self- diagnosed this as a faulty thermostat and had it replaced. The car now stays at temp once its on the motorway. However, i have noticed that when i stop accelarating or going down hills or off the motorway, the temperature goes down to around 60/70 degrees (used OBC menu). This is normally an issue when temperature is around 6C or lower outside. Is something else broken?

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Old 12-11-2018, 08:25 AM   #2
markusmarkus
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What brand is the new thermostat? The recommended brand for E46s with a gas (petrol) engine is Whaler. Those temperatures seem very low especially fir a diesel.
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Old 12-11-2018, 09:50 AM   #3
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Diesels run much cooler. The OE stock t-stat for these is 83-85C - Even a new t-stat in very cold weather at speed might not get the temps up high enough.

Try these: -it's what BMW made them for.

BMW OE Cooling Air Duct Cover

I use my own homemade version in my e46xi winter beater.

Some newer bimmers are now offering a louvre option that acts like a blind that will open and close with the press of a button for the same purpose.
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Last edited by BMW-North; 12-11-2018 at 09:53 AM.
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Old 12-12-2018, 07:32 AM   #4
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Wow! Why so low?
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Old 12-12-2018, 09:42 AM   #5
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Quote:
Originally Posted by markusmarkus View Post
Wow! Why so low?
Markus - it would be a very long winded explanation but basically for the same reason race versions run much cooler t-stats. Diesel combustion is hotter than petrol, and all BMW diesels are basically turbocharged. BMW diesels also don't use the characteristically mapped cooling logic found in the petrol cars.
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