Quote:
Originally Posted by Efthreeoh
I have the N52 in my '06 325i and the N52 in my '08 Z4. The Z4 has a coolant temperature gauge. It doesn't fluctuate.
IMO the coolant temp gauge in the E90 was ditched for real estate reasons. The E90 gauge cluster is small so as to allow room for the Idrive screen.
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The E36 and E46 had coolant gauges too, but they were artificial in many ways because the needle would stay right in the middle even though the temperature in those engines changed greatly during operation also. They made the 'normal' position cover a wider range of temperatures because the E30 (which more accurately reported coolant temperature) prompted lots of customers to go to the dealer reporting that the gauge was all over the place.
There's probably other reasons for it to be ditched like you said, but I know that is one of the reasons.