As the title states my fan will just turn on full then turn off. It doesn't have to be a warm day or A/C on. I watch the water temp with the JB4 mobil and the car is not hot.
My suspicion is water pump but I would love someone to tell me that it is not
I guess a waterpump on a xi is a real pain.
Thanks!

 

@seanjordan20 recently had that same issue, and his Fan was the culprit.

 

Thank you. God I hope so.

 

Do you have INPA or ISTA? That will tell you what your issue is by the messages it gives. My issue was a bit different. Usually when I hear a fan that's running high intermittently during idle or operation it's usually the pump or cooling sensor.

If you don't have one of those 2 programs and you have a laptop it's easy to get and about $20 for the cable

 

I do not have the INPA or the ISTA however I do have bmw schwaben tool. I willl try and run some tests. Thanks

 

Uh, I remember you unknowingly had that knock off fan, that was turning on full and then off when you first started the car. You said you replaced the fan. I ran out and checked my fan, for you.

 

It was the knockoff aux water pump causing my fan to trigger at startup. I still have my original fan.

 

Any suggestions on what I should do? I ran a fault test on the water pump with the schwaben tool with no issues. I usually have the JB4 screen on watching water temp. I am thinking it should be fine as long as I do not see the temp climb.
I am at 115k miles with no know history of the water pump. I will have to do it at some point, just trying to avoid it right now.

 

Have you had any a/c work done recently?

 

No and A/C works fantastic