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My 02 regal Ls with 256,000 miles runs great, but when start it up the low coolant light comes on and stays on till the car gets to temp then goes off. I just bought car so not sure how long it's been doing this. Yes there is coolant I checked other than that car is great... Please need help that light is annoying
 

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I have a 96 Regal that was doing that a while back then stayed off and has not been on since and like you my coolant level was ok. Not sure what would cause this.
 

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I have this problem now and again, especially after I did a cooling system flush a while back. Given how gunked up the radiator was, I'd imagine that had something to do with it.

I'm not entirely sure how it detects the levels, though.
 
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