control our engines temperature. What i mean is does a lower temp t stat do any good if my trucks comp.will just make it run 200* anyway?

 

Nope. Computer expects 195 stat, unless you tell it to expect something different, it won't make any difference at all.

 

Ten four

 

as said temperature control is all manual/mechanical.

engine constantly generates heat and tries to overheat.
water pump and radiator try to reduce heat.
t-stat tries to referee the game and hold engine at 195*

if everything works right, it holds dead on 195*
if any of the 3 malfunction, it swings one way or the other.

 

PCM only reads coolant temp and adjusts for it. It will pull timing drastically of it gets too hot.

 

In other words how can I make my truck run cooler without my trucks computer making it run hotter.

 

How can I make my truck run cooler with out its computer making it run hotter. Will a bad o2 sensor make my truck run hotter?

 

assuming your cooling system is working right, and you don't have any engine problems, put in a 180* Stant Super-stat and it will run at 180. the computer cannot/will not raise the temp.

don't put in a cheap $5 stat, get the better $10-12 Stant.
don't put in a 160 unless you want a permanent CEL and no heat in the winter.

 

I 've been through all this already I keep running at 200* with a 180 stat-2 different ones , even replaced a new lower rad hose cause I heard that they collapse. engine runs great.

 

Then you have an inefficiency in your cooling system somewhere. First place I would look, is the radiator. How old is it, when was the last time it was flushed? Might be time to remove it from the truck, and have it boiled out, or something similar.