Cooling


#1

What is the proper operating temp for a 5.7L, 1982 Chevy engine? The sensor is in the head on the left side of the engine. The temp gauge is a Stewart/Warner that shows actual temp not just a low and high with a space in between.


#2

I don’t know, but it should be a little above the opening temp of a stock thermostat.


#3

Depending on the ambient temperature, engine coolant temps can be anywhere from 210-225 degress F.

Tester


#4

It depends on the thermostat set temp. If it is at 190, no matter where you take a temperature reading, it will be 190.


#5

That 190 is the temperature at which the thermostat opens. Once it opens, it’s the job of the cooling system (radiator/fans} to keep coolant temperatures under control.

Tester


#6

My experience is that the thermostat will open at 190, in this case, and the engine will maintain that temperature. I have done this with several model cars and the temperature that is read is the temperature marked on the thermostat.


#7

Thanks for the help. I think I have either a bad/wrong thermostat or a defective gauge. The gauge tells me I am running at as much as 225 sometimes and yet I am not losing coolant. I suppose I could also have a bad water pump but if so it is not leaking. I have seen that in other applications where the impeller on the pump is erroded and so the flow is not adequate.

hbench


#8

Tester is correct with his reply.

If the vehicle has a 190 thermostat in it, that’s the temperature the t-stat opens at, and will be the lowest temperature the engine operates at.

In practice, engine temperatures will rise much higher than the t-stat rating - often rising to the 220 to 230 degree range (and those temps are considered “under control”).