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The BMW Range
3 Series
m20 running hot and cold...
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<blockquote data-quote="E34EuroTouring" data-source="post: 78959" data-attributes="member: 1026"><p>1) Fan Clutch.</p><p>2) Water pump. Is that functioning properly. Easy to determine.</p><p>3) termostat: either stuck half closed. replace that if , it has been years since you last change it.</p><p>4) Flush coolant. Put 50% distilled water and 50% BMW green coolant. I find about 4 litres coolant to 6 litres of distilled water is sufficient.</p><p></p><p>You might want to check if your Aux fan is working when the A/C is on. A non-functioning Aux fan will cause overheating at the stoplight/idling when A/C is on.</p></blockquote><p></p>
[QUOTE="E34EuroTouring, post: 78959, member: 1026"] 1) Fan Clutch. 2) Water pump. Is that functioning properly. Easy to determine. 3) termostat: either stuck half closed. replace that if , it has been years since you last change it. 4) Flush coolant. Put 50% distilled water and 50% BMW green coolant. I find about 4 litres coolant to 6 litres of distilled water is sufficient. You might want to check if your Aux fan is working when the A/C is on. A non-functioning Aux fan will cause overheating at the stoplight/idling when A/C is on. [/QUOTE]
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