i recently changed my thermostat when i decided that engine temperature as indicated on the gauge was fluctuating too much. it would dip down below 80C in easy driving then stay at it's customary 85C in normal conditions, occasionally rising to 95 - 97C in traffic where it's stopped by my resistive cooling mod. i concluded that my thermostat had started sticking and was slow in opening and closing.

upon reading Arthur Dalton's observations about the Wahler and Behr thermostat i went ahead and installed the Behr, noting that my old one was a Wahler. i also noted that the temp stamped on the new thermostat was 87C. anyhow, my temps don't fluctuate that much anymore but now it sits more in the 90 - 95C region, rising to 97C in traffic but still controlled by the cooling mod. it is somewhat different from my old setup where cruising would drop my temps to around 85C or a hair less. now cruising produces 90C - never less, and it doesn't matter if the AC is on or not.

i understand that these M104 engines run hot. i'm tempted to try a new Wahler thermostat to see if temps will go down a bit. also wanted to see what you folks have to say on this. (Arthur are you there?)

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joE
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
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