How do you find the relay switch for a fan motor on a 1999 Jeep Grand Cherokee?

The fan relay switch is located behind the passenger headlamp. The relay is visible, but you cannot get to it. There are two ways to get to it. Disassemble the complete front end including removing the upper core support or just removing the passenger headlamp, locate the location of the sensor, use a three inche hole saw and cut through the plastic carefully, watching for cables. The relay should now be eassily accessable.