Radiator fan isn't coming on

[Nj94TsiAwd]

Due to a continuous problem with overheating, I tried replacing my radiator with a spare that I had received from a friend. I put in the radiator, and followed the haynes manual. but I didn't unplug the battery, and I just continued through the steps. I installed it, and only the right fan will come on (the a/c I believe). The other left fan doesn't come on at all. What can be the problem?

 

[ProjectTwin]

Could be a few things...

What have you checked?

 

[Nj94TsiAwd]

Well I checked the two cables that connect, and i drove around for about 10 mins and let it idle for a few minutes..and only the none of the fans came on..even when i started revving the engine. the a/c fan only came on when i turned the a/c on.

 

[BUCK]

It won't come on till Temp gauge is about mid-point - Coolant Temp Fan Switch could be Bad or not plugged up - it's at Bottom passenger side of Radiator - that's where I would start.