Water Pumps and Thermostats

[Carmods@aol.com]

Tod, 
 
Your dissertation on cooling is right on. There is one thing I would like  to 
discuss is the effect of a thermostat in the system. A proper thermostat,  
when open, will provide a restriction that increases the pressure in the  block 
and pump. This pressure reduces pump cavitation and local boiling in  hot 
spots of the block and actually increases coolant flow.
 
                                                                              
          John  Logan