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Old 01-09-2013, 09:25 AM   #33
Registered User
Join Date: May 2008
Location: Indiana
Posts: 2,182
My Ride: 2003 330Ci
Originally Posted by jfoj View Post
DMAX, even if you were in 3rd on the highway, your temps should have still been a bit higher, HOWEVER, the thing that makes if hard for all of us to follow is if and when the DME has the thermostat heater activated??
My limited monitoring of my coolant temps with AutoEnginuity software shows that at about 3000 rpms the DME opens the thermostat.

The documentation I have seen from BMW indicates there are several factors as to when the DME opens the thermostat:

With the aid of this thermostat it is possible to specifically increase the coolant temperature in the partial load range. By increasing the coolant temperature under these engine operating conditions, it is possible to reduce fuel consumption. This characteristic map thermostat is controlled by the engine control unit dependent on a characteristic map.
This characteristic map is determined by the following factors:
Engine load
Engine speed
Vehicle speed
Intake temperature
Coolant temperature
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