Picture of the old flex-a-lite controller in my truck, vs the new one (new one on the left).
As you can see, probe style vs temperature bulb. Temp bulb for those who dont know goes inside the radiator hose and causes many leaks at times.

So, I bought the new design (actually its been out for a couple years I believe), which just uses a temp probe inserted into the radiator fins. I installed it in my truck and so far seems to work nicely (I need to dress up the wiring a little bit).

But yesterday I bought another controller to install on the camaro. I plan to override both the switch and ECM and use this controller instead.
http://truckperformance.com/products/?productID=494722

 

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