a 1991 325i,i noticed that the tempareture pointer guage is on red when i turn on the ignition without starting the car,,, i did replace the coolant sensor but no change

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW 3-Series E36 Cooling System Flush

If the engine starts, runs, and does not overheat, you could have a short in the wiring harness. Check your DME for fault codes using a BMW scan tool. There would be a code stored if a short is present.

- Nick