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Its almost obvious that's either Mechanical fan, or improper radiator (aftermarket radiators are way too thin for SC, and if mechanical fan is not operating properly, it will overheat. I had this issue and Victor/mustang helped me out) Now I have almost 2x thicker then stock radiator and properly working mechanical fan.
 

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Here is what I need you to tell me. I need as much information about Each as you can give me.

Supercharger oil level?
what Intake do you have
Hot under non boost or under boost or both?
how much Boost?
CAMS?
Antifreeze? or straight water?
Exhaust..CATS...ETC?
Spark plug Temperature range and type.

What engine and supercharger kit?
I wonder why so many questions? I had 9+ psi boost with TRD SC, and ran my truck trough Texas, New Mexico, Oklahoma heat (over 100*F). I had stock radiator, stock intake, stock spark plugs, stock cams, toyota antifreeze. Only aftermarket were headers. Truck ran fine. Now I have stock TRD SC on my 05 Tundra V8 and drove from CA to east coast and back many times with out any issues (on many occasions I tow 5K+ trailer). I even met a member in Dallas TX who also have TRD SC on his 06 Tundra and I've dynoed my truck at 108*F with out any cooling fan on a dyno (again zero overheating issues). My truck is 100% stock for exception of radiator and SC
 
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