Radiator fan works but won't turn on replaced the

The 1999-2004 Jeep Grand Cherokee fan relay is under the right front portion of your bumper support. The Bumper is easy to remove and is a 2 piece system. Take out your headlights (1 7mm bolt on each one), then take out all the 7mm bolts on the grill. Look up in thefront fender wells and there is 1 10mm bolt on each side with 3 or 4 plasctic rivits (cut the head off and push them through and replace with new plasctic rivits from your local parts store and make sure you have a plastic rivit setting tool). There is 3 plastic inserts under the bumper, pull the heads off, then pull the insert out. Your grill and bumper cover will then come off. The next part is to remove all of the Torx T27 bolts. Then disconnect the ambient air temperature sensor on the passenger side by the radiator. There is 2 clips (1 on each side) That hold the plastic in. Depresses them with a small pair of needle noise pliers. Push the air box clip through and the ambient air temperature sensor harness clip through. Once the plastic frame is off, release the electrical connectors for the head light harness, then the whole frame comes off. Once the frame comes off, on the passneger side is the fan relay. I like to use the after market Dorman fan relay because it comes with a new electrical pigtail. It is available from your local parts store. Dorman Part # 902-303. Good Luck