Question about 1996 BMW 318

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Overheating after replacing radiator & thermostat in my 94 318I

After replacing the radiator and thermostat in my 94 BMW 318I it is still overheating. After letting the vehicle run for about 10 to 15 minutes the temperature gauge is rising past 3/4 of the way.

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You could have a faulty temperature sensor or week water pump, and the antifreeze may not be the right 50/50 mix. To much antifreeze mix will still over heat, 100% antifreeze will gel up when heated restricting the fluid flow. Check the antifreeze mix and keep it to 50/50 mix (antifreeze/water), also check if you have an electric radiator fan that it's  working. Good luck and keep me posted. 

Posted on Jul 01, 2009

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Check sensor
check actual temp with non-contact thermometer

Posted on Jul 01, 2009

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BMW radiators are relatively cheap even at the dealer level ($250 approx), however BMW will almost certainly tell you that you must replace the thermostat. The thermostat is one of those parts that either works or not and if it has failed, you will know immediately after you test drive with the new rad. you should do that first before you waste more time and money on a thermostat you don't need. Most BMW's have a rad with a plastic upper hose connection and this fails - this is different than most other vehicles where the rad plugs up and the overheating prior to the final failure of the rad damages the thermostat

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