2008 328i Waterpump fuse keeps blowing.

iwantaM240i · 10-28-2022, 10:09 PM

I replaced my water pump yesterday and did the bleed cycle it worked just fine. This morning I did the bleed cycle again and it worked fine again. Today I went out for a drive and the car overheated again. So I check the fuse in the glovebox and it was blown I replace it with the same 40a fuse and it blew again. I replaced the fuse one more time and it blew in like 5 seconds and the car was not even on or running. I think I have a short somewhere. Has anyone had this issue before I am so sick of this and I do not want to have to take it to the mechanic. Thanks

mainbearing · 10-29-2022, 01:56 PM

You can disconnect the water pump and check the wires in the connector for a short to ground. gbalthrop has a nice diagram on there you can refer to in post #6 here:

https://www.e90post.com/forums/showthread.php?t=1766136

If you disconnect the connector and the fuse still blows, then wires #1 and #2 (the power wires) likely shorted to ground. #4 brown is ground, and #3 purple is the control signal.

10-28-2022, 10:09 PM	#1
iwantaM240i Registered 0 Rep 1 Posts Drives: BMW 328i 2008 Join Date: Oct 2022 Location: Atlanta iTrader: (0)	2008 328i Waterpump fuse keeps blowing. I replaced my water pump yesterday and did the bleed cycle it worked just fine. This morning I did the bleed cycle again and it worked fine again. Today I went out for a drive and the car overheated again. So I check the fuse in the glovebox and it was blown I replace it with the same 40a fuse and it blew again. I replaced the fuse one more time and it blew in like 5 seconds and the car was not even on or running. I think I have a short somewhere. Has anyone had this issue before I am so sick of this and I do not want to have to take it to the mechanic. Thanks
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10-29-2022, 01:56 PM	#2
mainbearing Lieutenant Colonel 1085 Rep 1,682 Posts Drives: BMW 328i Join Date: Apr 2019 Location: LA iTrader: (0)	You can disconnect the water pump and check the wires in the connector for a short to ground. gbalthrop has a nice diagram on there you can refer to in post #6 here: https://www.e90post.com/forums/showthread.php?t=1766136 If you disconnect the connector and the fuse still blows, then wires #1 and #2 (the power wires) likely shorted to ground. #4 brown is ground, and #3 purple is the control signal.
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