Quote:
Originally Posted by JFP in PA
Easy, when the coolant in an M96/97 is running 210F (99C in your world), a commonly observed steady state driving temp when measured with accurate instrumentation (which the dash display is notoriously not); due to the rather intricate cooling system layout in these engine cases and cylinder heads, there are areas of the engine that are often 20 to 30 degrees F warmer than the observed coolant temp due to restricted coolant flow. This leads to prolonged alloy component distortion and is one of the principal reasons these engines are prone to both cylinder head cracking and cylinder wall problems.
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I read my temps from the AC panel hack, not the temp gauge. It's not quite as accurate as direct from OBD, but I doubt it's anything like 10 degrees out (which is a lot in C). I have connected via OBD once and there was only a couple of degrees difference.
I do not think these cars run at 99C in normal driving. The stat would be wide open and the engine would then cool down. In steady state driving with good air flow, the stat is going to be partially open, not wide open.
Like I said, mine runs at 88 to 89 when cruising, which makes perfect sense given the stat starts opening at 86.