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The BMW Range
3 Series
E90, E91, E92, E93
Radiator Temperature On High Side
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<blockquote data-quote="e34_lover" data-source="post: 676207" data-attributes="member: 16259"><p>Definitely DO NOT use tap water. Only use distilled water mixed with original BMW coolant. Coolant has anti-rust, anti-corrosion properties and it is needed in the system. It should be flushed every 2 years or so as it can break down and become conductive.</p><p></p><p>Since the temp rises while driving as well as idling, it would probably rule out the fan as you get way more airflow while moving compared to the fan anyway. Can you confirm that your fan is working?</p><p></p><p>So you are left with 3 things. Waterpump, thermostat or coolant temperature sensor.</p><p></p><p>Just wondering where you are getting the coolant temperature readings? Does the car seem to warm up at faster or slower on different days? Trying to rule out the coolant temp sensor.</p><p></p><p>What I find strange is that it goes away a week after a spirited drive... This doesn't make sense to me at all.</p><p></p><p>Whats the mileage on your car?</p></blockquote><p></p>
[QUOTE="e34_lover, post: 676207, member: 16259"] Definitely DO NOT use tap water. Only use distilled water mixed with original BMW coolant. Coolant has anti-rust, anti-corrosion properties and it is needed in the system. It should be flushed every 2 years or so as it can break down and become conductive. Since the temp rises while driving as well as idling, it would probably rule out the fan as you get way more airflow while moving compared to the fan anyway. Can you confirm that your fan is working? So you are left with 3 things. Waterpump, thermostat or coolant temperature sensor. Just wondering where you are getting the coolant temperature readings? Does the car seem to warm up at faster or slower on different days? Trying to rule out the coolant temp sensor. What I find strange is that it goes away a week after a spirited drive... This doesn't make sense to me at all. Whats the mileage on your car? [/QUOTE]
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The BMW Range
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E90, E91, E92, E93
Radiator Temperature On High Side
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