An easy(and safe) way to check if the coupling needs the silicone gel is to let the engine run and someone turns it off. the fan is suppose to stop after another 5 turns or so. If the fan doesn't stop wuickly once you've turned the engine off, then it could be the gel. I had this problem with a Hilux, however it was fine when travelling at speed (the faster the better) because the airflow cools the engine. it only became a problem if the car was idling.
Once that was fixed, it was running fine except when going a bit faster (being faster than 100km). when the engine was heating up a bit and especially on long hill or on hot days. First thing to do is switch off the aircon (if you have one). In my case, the aircon condensor sits in front of the radiator and the blades were bent etc, so the airflow wasn't coming through. Check it out and see if it can be straightend with a gentle nudge. After all that, I also had to replace the radiator because of lots and lots of corrugated roads I travelled on here in Oz. there was a crack in one of the corners.
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