[DeTomaso] Radiator Fans Running Constantly

[Mike Reilly]

All, thanks for all the great trouble shooting tips.  I deduced that both my thermo switches are bad.   Summary:- when the two wires (brown and black) are connected to the thermo switch the fans run constantly- when the two wires are switched on the thermo sensor the fans still run constantly- when I connect the thermo leads to each other the relays work- connecting a connectivity meter to the blades of the thermo switches shows that they are in the closed position and allowing current flow, thus the fans always run My new rebuilt radiator is working great but I am surprised that both thermo switches are bad given that they both worked fine before the radiator was re-cored.  I guess something happened to them during boiling out and welding of the new radiator components if the shop had the sensors mounted while doing the work.  I'll be looking to order some new ones or go with the slick fan control kit from Pantera Electronics.   Thanks again!  Mike
 		 	   		  
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   All, thanks for all the great trouble shooting tips.  I deduced that
   both my thermo switches are bad.   Summary:
   - when the two wires (brown and black) are connected to the thermo
   switch the fans run constantly
   - when the two wires are switched on the thermo sensor the fans still
   run constantly
   - when I connect the thermo leads to each other the relays work
   - connecting a connectivity meter to the blades of the thermo switches
   shows that they are in the closed position and allowing current flow,
   thus the fans always run

   My new rebuilt radiator is working great but I am surprised that both
   thermo switches are bad given that they both worked fine before the
   radiator was re-cored.  I guess something happened to them during
   boiling out and welding of the new radiator components if the shop had
   the sensors mounted while doing the work.  I'll be looking to order
   some new ones or go with the slick fan control kit from Pantera
   Electronics.   Thanks again!  Mike