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I am having a problem with my 2002 GU ZD30 Patrol. the other day I was driving on the freeway and noticed that the temp gauge was just above 1/2. It was a warm day and I had the ac on but this was unusual (never seen the temp go up in the car). subsequently it returned to normal and then didnt do anything for a couple of days, but now has started playing up all the time heading to 3/4 frequently. Im not losing any coolant, the overflow tank is on min, I can see the radiator fluid moving so I don't think it is the pump. What I think it may be is the fan clutch slipping. Is there anyway I can test this? When the car is hot with the engine off I can spin the fan with little to no resistance.
The second part to the question is if it is the fan clutch can I change the silicone in it? I understand that the fan clutch and water pump are a unit, is it possible to take the pump off so that I can take the front off the fan clutch to replace the silicone?