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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-14-2013, 02:25 PM   #21
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Join Date: Sep 2011
Location: TEXAS - Circuit of the Americas doing laps with my M5 and coming in for a pit stop.
Posts: 3,462
My Ride: 03 330iT SportWagon
Originally Posted by Rotten Robbie View Post
Would a bad vacuum line prevent the electric air pump from turning on? I think it worked before I did the head gasket, at least the check engine light was not on, and I did drive the car home a few miles with the bad HG after buying it from a CL add.
I'll take a good look at it tonight, and test for vac cold. I did have it off, and I think it looked ok, I trimmed a 1/2" off the ends so it would fit tighter when I put it back together.
I just wonder if I didn't get something plugged in to the right spot when I did the HG... It all seemed to all go back together with no mysteries etc.
Is there an easy way to test the electric fan? I think I heard to remove the connector in the lower rad hose and it should come on or something.

-Oh yea, I did replace the plastic cooling tube that goes from the head to the hose under the intake manifold. I sure wouldn't want to tackle that one with out the intake manifold removed...

Thanks again for the help
If you are talking about your SAP, then it will only come on when the ambient temp is lower. This usually happens in the morning. If your car is warmed up before started, it al not come on.

Check your electrical connection under your SAP. Reset your code if you have not.
Engine swaps, HG, GM & ZF tranny rebuilds.

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