Join Date: Apr 2003
Location: Toronto, Ontario, Canada
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hey buddy, I have a 1991 318i and I have the exact same problem as you. My buddy owns a garage so I took it in one day and worked it on it with one of his mechanics. We flushed the cooling system, I changed the thermostat, fan is working fine, replaced the battery in the odometer unit, tested the circuit, checked out the sensor and the fuses. Everything was fine. And my needle fluatutes too. Sometimes it will go right to red and when you smack the dash it will jump back to 3/4 or 1/2. But even when it was all the way at red I know that the engine wasn't over heading. So it doens't bothe rme anymore I just drive normal even when it's sitting at red. Seomtimes I drive for hours when it's at red. If your engine is acutally over heading and it it was all the way at red, we'd see smoke coming out of our car by now. It's an older car sometimes things just malfunction over time. But when it gets a little warmer here in Canada, I'll certianly look deeper into it. But I'll keep you posted or vice versa when one of us find out what the source of the problem is.