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The BMW Range
3 Series
E46
Is my E46 running too cold ?
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<blockquote data-quote="IanDaddy" data-source="post: 726921" data-attributes="member: 18207"><p>Recently I have been monitoring closely the coolant temperature of my M54B25. IIRC, it used to range from about 87 to 97C.</p><p></p><p>To my surprise, the low point now sometimes go as low as 78C in highway cruising at 120km/h and 80C in heavy traffic.</p><p></p><p>When I compare the coolant temp (A) at the engine block with the inlet temp (B), I will B go down when A is going up until it reach the high point (A = 97, B = 50)</p><p>then the opposite happen until both values are about the same at about 80C. Then the cycle repeats.</p><p></p><p>I think this is normal behavior when the thermostat opening and closing, it is just that the lower end of the temp is in my opinion too low which is bad for engine efficiency.</p><p></p><p>My diagnosis is the thermostat is kinda stuck open or close too slowly when the temp drop. </p><p></p><p>Anyone measure their working temp range of their E46 ? Will appreciate advice.</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="IanDaddy, post: 726921, member: 18207"] Recently I have been monitoring closely the coolant temperature of my M54B25. IIRC, it used to range from about 87 to 97C. To my surprise, the low point now sometimes go as low as 78C in highway cruising at 120km/h and 80C in heavy traffic. When I compare the coolant temp (A) at the engine block with the inlet temp (B), I will B go down when A is going up until it reach the high point (A = 97, B = 50) then the opposite happen until both values are about the same at about 80C. Then the cycle repeats. I think this is normal behavior when the thermostat opening and closing, it is just that the lower end of the temp is in my opinion too low which is bad for engine efficiency. My diagnosis is the thermostat is kinda stuck open or close too slowly when the temp drop. Anyone measure their working temp range of their E46 ? Will appreciate advice. Thanks [/QUOTE]
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Is my E46 running too cold ?
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