I am pretty sure that it is the cooling fan constantly turning on, you have to remember that the GX is no small SUV. That V8 will heat up and quick. On my GS430, the fans always roar on every few minutes and that is a smaller V8 than yours...
As long as the coolant is fresh and the temp. gauge on the instrument cluster is in the middle, you are fine.
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2002 Lexus GS430 Nav/ML/K&N Filter/Tints/Spoiler/LED Mods, Custom Magnaflow Exhaust, Painted/Logo Calipers, Powerslot Front & Rear Drilled/Slotted Rotors, SRT Intake w/ECU 
2002 Lexus RX300 AWD Coach Edition LED Mods/TV w/ DVD
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