i have a 1983.5 vanagon with no ac so i dont have a resistor that i can see, and not sure if the radiator fan is working correctly.  I tested the plug and when i jump out the one terminal i get the high fan when i do the other one i get nothing.  is there a low speed to this?  the cooling temp goes over the center warning light if i am just in idle but not sure how far it will go before the high fan will kick in

thanks

jed