Coolant temperature going down

[ALFAitalia]

Yep.....torque pro only shows a 4 or 5 degree fluctuation in coolant temp. in normal driving. I don't think they are dummy on our cars.... they go up slowly as the temp rises....creap up a little further in heavy traffic, hot weather driving. I know some on VWs used to do that....they used to say that it stopped it moving suddenly and worrying customers....like when the stat opens for the first time in the morning and the temp drops for a few seconds. I think they were more "heavily damped" than dummy.

 

[Dickie Fix]

This is for the OM651, but it illustrates how complex cooling systems have become.