e90 cooling issues

mavic · 03-13-2014, 05:36 PM

Hey gang,

So I replaced my water pump and thermostat after getting the yellow warning light since my 07 has 77k miles. However, I have had low coolant warnings days later topping off with 50/50 solution followed by the bleeding procedure.

So it appears the coolant is boiling out. Radiator fan appears to kick in around 105-108C. Could my new water pump be faulty or perhaps the radiator fan is faulty and turning on too late?

Any help appreciated.

bmwsinceday1 · 03-13-2014, 07:20 PM

You should be able to test the thermostat yourself- put it in a pan of water, heat up, watch it as it approaches about 175F (or whatever the stat spec is for your car- Im not 100% sure its 175), use a good glass alcohol/mercury thermometer, and it should open up at around 180-190 deg F. 105C sounds way to hot.

03-13-2014, 05:36 PM	#1
mavic Registered 0 Rep 1 Posts Drives: 2007 335i Join Date: Mar 2014 Location: San Jose iTrader: (0)	e90 cooling issues Hey gang, So I replaced my water pump and thermostat after getting the yellow warning light since my 07 has 77k miles. However, I have had low coolant warnings days later topping off with 50/50 solution followed by the bleeding procedure. So it appears the coolant is boiling out. Radiator fan appears to kick in around 105-108C. Could my new water pump be faulty or perhaps the radiator fan is faulty and turning on too late? Any help appreciated.
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03-13-2014, 07:20 PM	#2
bmwsinceday1 Private 4 Rep 98 Posts Drives: 2009 328i Join Date: Oct 2013 Location: fl iTrader: (0)	You should be able to test the thermostat yourself- put it in a pan of water, heat up, watch it as it approaches about 175F (or whatever the stat spec is for your car- Im not 100% sure its 175), use a good glass alcohol/mercury thermometer, and it should open up at around 180-190 deg F. 105C sounds way to hot.
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