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some questios, in text.
Okay, some posts here are driving me nuts! Changing your car to a "cooler" thermostat (i.e., going from an 89 to an 82) DOES NOT keep the engine cooler. NO IT DOESN'T!!!! What it does is give the coolant less time to stay in the engine and soak up all the heat.
(((Coolant is running through the engine at all time, is it not? Temperature fluctiation is relative stable when the engine is warmed up. Arte you saying cool fluid cycles through the engine? We're only talking a 7C difference between thermostats, and the operating temperature of the coolant with a car fitted with eiter thermostat will be quite close. remember* it is the thermostat taht OPENS at taht temperature, not necessarily the contant temperature of the coolant. In some cases, the coolant will be the SAME temperature at times during the regular operation on the engine. Fit a water temperature gauge, they don't lie.)))
You want your coolant hot. Cold coolant is not soaking enough heat away from the engine.
((could you explain further?)))
The coolant will keep cycling through faster and faster and temperature can spiral out of control.
(((how do you figure that? I've had both temperatures of thermostats, and notice opening of the 82C only marinable more often than the 89, in heavy traffic. Eventually it STAYS open when hot enough untill the FAN cools the temp down to 82. So in effect the coolant is far from hot, at 82C, and not too much different than 89!)))
(((I also have a cylinder tem gauge and the only time I saw the head temp spiral out of control, is when I overheated from a blown hose. Under ALL conditions the cylinder head temp was marginably cooler than the hotter stat and fan switch. I'm not really understanding your logic. Call me whacko, but my gauges are indicating different than what you state, and go along the line of conventional logic. Has there been research done to back you claims?))) I may be missing something here....
It won't get much cooler than that A "hotter" thermostat lets more heat soak into the coolant and lets the coolant in the radiator cool off longer. This ultimately leads to a cooler running engine. Any questions?!?!?
(((This is wrong, my cylinder head temperatures are higher with 89C thermostat. This is actually a good thing in terms of fuel economy and can be substantiated by Dr. Boost, who is an engineer at Saab. He claim hotter engine is more efficient. If you fit a water temp gauge, you will find that the radiator does NOT cool the temp much more than the thermostat rating, arounf 78C for the 82C and maybe about 85C ofth e 89. HTat is what I've found, but you may have otehr findings))
steve
posted by 24.64.223...
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