Strictly mechanical
There's a viscous fluid inside the clutch that becomes more viscous (thick) with heat. So, as the fan clutch gets hotter, the clutch grabs more.
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18 years ago
T-shooting cooling problem
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18 years ago
temperature range.
Symptoms which point to either an airflow problem or a constricted flow volume problem. A partially obstructed radiator (or hose) would give these exact symptoms. Replace the radiator. Also make sure you have the right water to antifreeze fluid ratio.
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18 years ago
In a way, yes, since it is in fact another radiator. Actually, it is in itself a miniature cooling system that is for the most part independent of the radiator and bypassing the thermostat. If you have replaced the thermostat then it is looking more and more like the radiator or cooling fan as the source of your problems. If you are sure that the cooling fan is operating properly and there is nothing wrong with the radiator hoses (such as a collapsing lower hose), it almost has to be the radiator. IIRC, you did say that this is a used vehicle and if so, the original owner may have dumped a shit load of stop leak into it at one time or may have neglected the system to the point that the tubes are plugged with rust and debris. I would bring the radiator to a radiator shop and let them clean it and look it over for potential problems.