Hi speedy266, All

This might help.

If we were to put a pot containing 1 gallon of water on a stove with a high flame under it, it would take at least several minutes reach 212. If we then turned off the heat and poured a gallon of 32* water in with it, we would be able to put a finger in the mixture in seconds without fear of being burnt. If we left the heat on, the difference would be minimal.
Is this what has been described?

Or we can leave the fire on and remove a small amount of the 212 water at a constant rate, then by adding enough 32 water to replace that which was lost we can maintain the 212 temp.
This is what I believe should happen.

Possibly a combination of the two?

Regards, Norm

Still waiting for Hans to explain himself.

this is about chemistry and physics and science related stuff now. Of how water equalizes, heats up, cools down. One thing though the thermostat is a cheap mechanical device. Not computer controlled, in the future it might be, and than temps will be controlled very well. Mechanical thermostats can be tricked or by passed. At idle or low rpm speed when the stat opens not much coolant will flow through it before it closes. With the engine rpms higher more will flow by it before it closes because of pressure and turbulance related stuff.

If you agree with that than, different amounts of really cold fluid getting in will have different effects on engine temp.

Hi speedy266, All,


It's how the cooling system is designed to work with these variables.


When the thermostat is no longer up to the job, its function will be given over to the computer.


Once it begins to open, it should not close until well after the engine is shut off.

Regards, Norm

With the heater on full blast, do you think the thermostat would still be able to keep the engine temp around operating temp or would it be less?

it will take a little more time to get the engine up to normal operating temp with the heater on (if you're starting with a cold engine)... but if the stat is working properly it should have no problem maintaining normal operating temp, even if the heater is on.

Hi speedy266, All


In theory, if the stat is rated at 180, the system is supposed keep the temp at 180 and under normal condidtions it does. In hot weather with the stat fully open, temp can go way above 180 and in cold weather with it nearly closed, temp can stay well below 180, heater or no heater.

Regards, Norm

Hi Speedy266, 73Delta88, All,


That too.

Regrds, Norm

Ok well on an astro the operating temp is like 195F as the thermostat is, with the heater one full blast, rear and front, when first turned on with cold coolant in the core temps will drop down 150F than once all the coolant has a chance to heat up it will stay at a temp of 160F or so, and with the heater on full blast it can probably only rise to 170F before the stat opens (needle moves down to 160F again.

In the ciera with the heater on full blast the change is minimal probably only notice a lower temp of about 5F. Heater isnt as powerful as the astros heater, if i keep my hand near the astro vent when on full blast it burns my hand, i guess its needed to keep that huge box warm in the winter.

Hi speedy266, All,


As discussed before, temps will vary according to those outside. Adding two heaters to the system will, in effect, add more area to the radiator and the engine will run cooler than it would have with the heaters off.


Smaller heater doesn't add as much area to the radiator.

Numbers can also vary, depending whether coolant circulation is stopped when the heater is turned off.

Regards, Norm

Am I wrong? I'm not sure what to make of you're "laughing" emoticon... Who or what are you laughing at?

Hi 73Delta88, All,


Not at you, at myself.

You were correct and you answered his question more accurately and in less space than I did. If you had been wrong, I would have explained why.

I guess I need to learn the correct use of emoticons.

Regards, Norm

I figured that's what you meant, but I had to be sure

As for the proper use if emoticons, I don't think there is one right way to use them, it's just that sometimes people interpret things differently.

ok, back to the thermostat conversation...