New thermostat and coolant temp sensor. Light still comes on with code. 1995 Mazda b4000 4x4 4.0L automatic.

 

What does the gauge on the dash show?
Just below 1/2 after 10min driving is correct, 185-190 degF, 1/2 is about 200degF

 

Can I just let is sit or should I drive it?

 

Just idling for 10min should get to 185-190degF

If doing it that way open the hood and start engine, turn on heater
Feel heater hoses and upper rad hose, should be cold of course
Wait 2 min and feel those hoses again
Heater hoses should be warming up, upper rad hose still COLD, no circulation
Then a few more minutes and feel again

Should be the same, heater hoses are hot and upper rad hose cool, this means thermostat is working
Thermostat controls circulation thru the radiator, and there should be no flow to radiator until coolant in the engine reaches 190+degF

If upper rad hose is heating up the same as heater hoses then thermostat is not working, its stuck open

 

Thanks again it was the thermostat or the connection on top of one of the sensors any who it works again that's all that Matters. Now my car can tell me if it's to hot again wo who lol that s two now I owe you.