Re: buffered coolant temp guage



There are occasions where the BMW cooling system fails rather suddenly (V-8 E39's seem more prone than most), typically a crack in the plastic hose connection on the radiator. The buffered system is fine and you're correct that it indicates "nominal" temperature across an acceptable operating range of temps by indicating a 12 o'clock needle position.
An old style temp gauge will rise and fall slightly between the thermostat setting and its max load temp (think steep hill, high rpm, hot day). It will also show a steady rise if coolant is rapidly leaving the system through a leak, an early indicator that you might want to prepare for a rapid exit and shutdown.
The buffered gauge will do neither. After a sufficient amount of coolant has left you'll be confronted by a rapidly rising gauge and precious little time to perform neccessary action.
While there appears to be no way to modify the gauge, aftermarket systems work well and can also report oil temp (a luxury afforded M-drivers vice the worthless MPG gauge), oil pressure, volts, or whatever. These are minor mods, the kits are typically well-engineered and will not harm the vehicle.
R / John
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wrote:
<on temperature gauges>

Now, this may not be relevant to modern gauges and cars, but a trick I learned years ago on race cars that you can drive to the track (ahem) is to use the same electrical temperature gauge for both coolant and engine oil temperatures. Obviously, you need to have both sensors present. The trick is just a simple toggle switch to change between them. The temperature ranges are similar.
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Dan.

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You also have a low coolant level warning light...
And I'm not convinced the BMW gauge reacts differently than a 'normal' one if a hose split etc.
--
*Middle age is when it takes longer to rest than to get tired.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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London SW

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