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So further to my previous post about the 330d seeming very slow to warm up, I have accessed the digital engine temperature readout in the OBC display and it turns out that even though the temp gauge looks almost in the middle after 15-20 minutes of running, the engine temp did not exceed 65c, or briefly 66c when I turned the heating off.
So definitely a faulty thermostat! I have now purchased a new one and will fit it soon.
However I was quite surprised that the temp guage displays the engine temperature as normal when in reality it (even on a very hot day) would most likely be no more than 70-75, at least 20 degrees too cold. Do they all do this, or is it possible I may also have a faulty cluster (I have noted it is not the original one for this car)?
Cheers all
 

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Well I thought at higher opening tempetature. Minimum engine will higher.

But another thing, I forgot.... our thermostat has heating element.
I suppose ECU can also control thermostat.
 

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Well I thought at higher opening tempetature. Minimum engine will higher.

But another thing, I forgot.... our thermostat has heating element.
I suppose ECU can also control thermostat.
The original main thermostat is 88 C so reaching that is plenty enough if it only works.

Diesel engines don't have map controlled thermostat like petrols do.
 
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