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I have changed coolant and purged the system several times in our 2 e60's. Over the weekend I changed the coolant pump and thermostat on the 530xi. It has the N52 with external pump and thermostat.
For some reason, the purge cycle will not start. I even pulled out the Bentley manual to be sure I had the steps right.
Oddly, after trying to purge, when I press start to turn everything off, it won't turn off. I have to eject the fob to turn stuff off. If I run the car the stop works perfectly.
Any ideas? I'm beginning to think I have a wonky pump sending weird signals or something.
Thanks!
 
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