The cooling fan on the backside of the raditor comes on when air is turned on on 1996 Pontiac Trans Sport

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The fan on the front of the raditor does not come on. Ive tested to see if power was comming to it and there was none. ive checked the wires and they are fine. Could it be a relay? and where would it be located?
(1) Answer
Check your fuses. There should be a fan fuse in the fuse block either in the engine bay or under the dash on the drivers side. You might also find the a relay there also. When checking for power you just have to work your way back to the source. Trace the wires back from the fan. The power stops somewhere. i tried to find a schematic but couldnt find a good one to share. Buying a haynes manual may really help.