Quote:
Originally Posted by James.uk
Hmmm... So what about partially blocking off the radiator? An old trick I know, but one that has worked for me in the past on other cars? 
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James
The reply from BMW and our experience tells me that it won't work purely because our engine does not produce enough heat.
If the thermostat doesn't open, & it probably never does in winter conditions, no water passes through the radiator, so you can't heat it up by covering the radiator.
However, covering it will stop cold air, to a certain extent, cooling the block etc. so that would probably help retain heat but beware when hotter weather comes (fat chance ! !)
My old B18 petrol Volvo had a sprung roller blind operated by a 'lavatory chain' pull on the dash which was brilliant to get the temp. up quickly (but I forgot it once and nearly cooked the engine !) Looked down at the temp gauge and there was no needle, was right off the gauge.