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Originally Posted by Efthreeoh
Then why does the coolant temp gauge in my N52-powered Z4 not fluctuate? Besides engine cooling systems keep the engine at the peak temperature for emissions and fuel consumption.
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Has the Z4 ever overheated on you? I'm curious what the gauge did if so...I'm assuming that the gauge is buffered like it was on the E46. Did you have much time to react?
The E46 gauge wasn't super helpful because by the time it started to move the engine was basically overheating already. The N52 runs hotter than the M54 under normal conditions, so I think that having a coolant gauge would be even less useful. That's my best guess as to why there isn't one on the E90...it just wouldn't really be any more helpful than the warning light.