The problem is that the idiot light sensor doesn't close until the engine's WAY hot. This would mean the fan wouldn't come on until the engine was over heating.
I've been very happy with my switch (I bought it, though, and so paid alot more than $10) with a probe in the upper radiator hose inlet on the radiator.
I've been very happy with my switch (I bought it, though, and so paid alot more than $10) with a probe in the upper radiator hose inlet on the radiator.