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E60 / E61 (2004 - 2010)
BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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Old 03-27-2013, 12:50 PM
bimmerfan52 bimmerfan52 is offline
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Location: Arizona
Join Date: Feb 2012
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Mein Auto: 545i
Originally Posted by bmwrulez View Post
Thanks for the info on testing the thermostat. Found out i replaced a good thermostat. Oh well. But, does the same process apply for testing ohms on water pump? I'm getting a 1 when testing.

Sent from my SCH-I535 using Bimmer App
The resistance test is for the heating coil in the thermostat only, and just tests that the coil is intact. And of course the resistance test will not diagnose a thermostat that is physically sticking open or closed.

Temperature probes (thermal couple) typically work on the basis of dissimilar metals generating a voltage based upon the temperature. You can test its accuracy by placing the probe in water, raising the water temperature to different levels (while measuring water temperature with a thermometer) and measuring the voltage generated from the probe at each point. You would probably need the manufacturers chart of temperature to voltage to tell if it is within the manufacturers specifications.
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Old 05-25-2013, 08:51 AM
bmwrulez bmwrulez is online now
Location: Hickory,NC
Join Date: Nov 2008
Posts: 12
Mein Auto: 05 545i, 06 330i (Hers)
Update: Replaced the thermostat again with an OEM part, due to recommendation of indy mechanic. Fixed my problem!!!!! Driven over 500 miles & no MIL.
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Old 05-26-2013, 11:24 PM
Kalil147 Kalil147 is offline
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Location: Miami
Join Date: Aug 2011
Posts: 160
Mein Auto: BMW 545i
Where can I find the air pump relay? I already replaced the thermostat about 2k miles ago and I still get the P0507 code.
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