Thread: Car Overheating
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      01-03-2013, 07:48 PM   #3
Aperture Vision
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Drives: 2006 e90 325i
Join Date: Jan 2013
Location: Virginia, USA

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I just replaced my coolant pump and thermostat myself. My scan tool couldn't tell me if it was the pump or not, so I took it to a local shop that did a scan and it came up with the pump and tstat being bad. Once I got under the car I saw the pump was disconnected electrically, so I plugged it up and the car still overheated. The tstat was still bad, but I replaced the pump anyways since I was there. I paid like $450 in parts (pump, tstat, and coolant) and about 3.5 hours of my own time replacing it. Only thing you can do is get it scanned with a tool that is capable of checking pump and tstat voltages and RPMs and then maybe a pressure test to see if there is a leak. And maybe your pump didn't complete the bleeding process and there is air in the system.