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I would replace the temp sensor again and very carefully check its wiring and connection. Since the sensor solved the issue for a week, I think the problem does lie here. Also, it is common for the sensors to go bad after an overheat, not the computer or cluster.

If the wiring checks out and the problem keeps occuring, then it would have to be either the computer or the cluster (more likely the computer). You are talking pretty big money either way so before biting off on either it would be prudent to have a bmw dealer scan the car to see if their factory equipment can verify the cause for you. A cluster or computer replacement will require dealer equipment to accomplish anyways, so it will be hard to avoid the dealer if it gets to this.

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Okay, they replaced the wrong sensor. The sensor by the radiator is only to influence the speed of the eletric auxiliary fan.

you need to change the sensor at the water pump / front of engine

also make sure there is no air in the system and that the cooling system has been properly bled

I would only invest in a computer diagnosis if it is using a BMW factory scan tool.

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I would pull over immediately if you get an overheat warning.

Normally, you do not need to turn the car off to reset the guage, it will move as the temperature of the engine goes up and down. So if the engine gets hot, it goes up, if the engine starts to cool, it goes down on its own.

If it spikes to hot on you, then it goes back to normal after turning the engine on and off then it should be fine. If not, then you may have an actual legitimate overheat so I would not drive it in that condition. So, the answer is, do not drive if the guage is in the red.

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Please do not select either of the left hand ratings - please simply reply if you require anything additional and I will be happy to answer any follow up questions you may have. Thank you and best of luck with your vehicle

yes the sensor (or its wiring/connection) or possibly air in the system is what I suspect.

Please use the "reply" or "continue conversation" link if you have further questions. Otherwise please select a positive feedback rating (FAR RIGHT) so that I may be credited and compensated for the assistance I have provided.

Please do not select either of the left hand ratings - please simply reply if you require anything additional and I will be happy to answer any follow up questions you may have. Thank you and best of luck with your vehicle

you should have five selections, either stars or smiley faces, please select the best one.

or, if you just have an "ACCEPT" button, please just click that.

Thank you, XXXXX XXXXX luck with your vehicle.

Steve

there should be an accept button or something for you to click to "give your expert credit" or something to that effect - maybe "ACCEPT" or something like that.

If not, please let me know and I can have the site moderators resolve the issue.

thank you again.

okay, thank you for that.

I will have the site admin fix the issue

good luck with your vehicle.

Steve