Coolant sensor question on 85 pickup 22re

[vegasfj40]

Hello everyone,
Yesterday I was tinkering under the hood of my pickup and repaired the connector to the switch on top of the tstat housing. I was doing some research trying to figure out what this sensor is for and found an old thread where KLF mentioned something about a FPU sensor or fuel pressure up system. Does anyone know exactly what this system does?

 

[pappy]

Not fuel pressure. The fuel pressure regulator and VSV are at the back of the rocker arm cover. That sensor has something to do with the A/C. I think it will cut the A/C off if the engine gets too hot.

 

[vegasfj40]

Ok. Thanks for the quick reply Pappy! Ive been searching the internet for a definition of that sensor and really couldn't find anything on it. It's not shown in the 85 FSM that I could see. Not sure if it's in the wiring manual.

 

[pappy]

It's not shown in the 85 FSM that I could see. Not sure if it's in the wiring manual.

Without looking, I think it is buried in the FSM, I think in the back with the AC stuff.