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E21, E30General discussion and technical help for 1975-1991 3 series cars.
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My coolant sensor was doing that and it turned out I had a every so super slow leek cuz one of my clamps was loose.
My coolant level didnt go down notably and was always full but that clamp being loose was what did it cuz once it was tightened up there was no problem with my coolant since.