D2 A8/S8 (1997 - 2003)
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Good technical analyses. If you didn't know this already, BMW thermostat approach may interest you.
Posted by: semso55 (106058) on 2018-02-04 18:56:06
In Reply to: I agree with your logic, but... posted by hyperlogos on 2018-02-04 17:50:48

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This thermostat is found mostly on newer models.
While it's ingenious in theory, they fail somewhat more often than regular thermostats and in rare cases they cause havoc as coolant reaches ECU box because wiring loom acts as a path.

Also, while running 105 C - 110 C is great for fuel economy and clean emissions, the increased heat and pressure (more heat = more pressure) is not great for plastic cooling components as well know in BMW world.

On my current X5 and previous 540 I converted back to conventional thermostat and used simple resistor to fool ECU thinking original thermostat is still there.

Anyway, I'll probably stick with 82 C as it seems it is designed for my engine or 87 C at the highest.
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All messages | Search Forums | Return to D2 A8/S8 (1997 - 2003)