After market radiator fan??

[BMWX1-35i]

I'm not pleased with the way BMW setup when the fan kicks on to cool things down and I don't see any way to change it.. So, If I installed an aftermarket fan and controller to cool the radiator, will I get any codes by removing the OEM fan and keeping it unplugged?

[Pig Farmer]

At one point I had a bad relay running to the PPK2 fan which caused the fan to run nonstop one night. In the morning my instrument panel lit up like a Christmas tree, and the battery was so low I couldn't check the codes. Out of pure luck I noticed the relay was warm. I immediately pulled the relay and unplugged the fan. Once the battery was charged, I checked the codes which showed a short circuit (forget the code number). I cleared the code and took a short trip without the fan connected. I didn't get a code, but I only drove a couple miles to see what kind of water temps I would see without the fan.

Out of curiosity, what kind of water temps are you seeing that is giving you cause for concern? What I have noticed is that the ECU allows the temps to run higher (say 212-218) when driving at a relatively constant speed around town. But if you jump on the throttle, the water temp actually drops (the oil temp may go up however). I'm pretty sure BMW has designed it this way, and that the water pump has as much to do with this as the radiator fan. I'm sure you are well aware that higher temps equal better emissions, and BMW's ECU is very keen on emissions.

[BMWX1-35i]

Originally Posted by Pig Farmer

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Out of curiosity, what kind of water temps are you seeing that is giving you cause for concern? .

Well, if I'm running around town (summer time), temps don't seem temps go above 195, oil or water. This is the first time the car sat at an idle for any amount of time like that (only had it 6 months) and when I was done with my visit to a friends body shop, the car was at about 220. It dropped down to 180 on my ride home (temps were about 55 that day). I did not notice any fans running when I cam out unless the radiator fan is that quiet.

When I go home I let it idle again till the temp was at around 200 - 210, fan did not come on. I turned on the AC at max and the fan came on but not for long. I assume the ambient temps had allot to do with that.

I guess my concern is if this seems normal? I'm not sure what normal water temps should be at the return hose to the radiator or if the fan should be coming on at that point or not. I have always had muscle cars so my knowledge with BMW's are not as extensive.

[BMWX1-35i]

Anyone pull the OEM fan out for an aftermarket with more air flow and more control??

[BMWX1-35i]

I'm surprised there has not been more mods in this area of cooling. B