Clutch fans Thermal or non Thermal

[slangone]

All,

What's the differernce, between thermal and non thermal clutch fans.
Which one is stock and which is best.

My stock 360 fan spins when I start the engine, is this OK, should is get hot first?

[Coondawg]

Thermal all the way.
Non thermal will only spin at a fixed rate. Higher the rpms, more air it pushes.
Thermal has a thermostat built in, it will spin faster as the engine heats up...

[-Bluegill-]

Stock = thermal

[710 Burner]

Thermal will pay for itself in fuel savings.