coolant temperature sensor

can anyone tell me where the coolant temperature sensor is located on 1991 s10blazer? Also, what is a temperature sender? thanks

http://autozone.com/servlet/UiBroker/?UseCase=C001&UserAction=performQuickPartType&Parameters=%7C%7EAuto+Store%7C%7ECOMPONENT+LOCATIO NS%7C%7ECoolant+Temperature+Sensor


http://autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/19/0e/ba/0900823d80190eba.jsp

There are two possibly, on by the thermostat housing and one between the number 2 and 4 cylinders on the passenger side of the head.

the one on the pass side of the engine is for the gauge, the by the t-stat is for the computer

thread is over a year old. please refrain from bringing back old threads.