I read a thread and said that if one would run an electric fan on all the time, the engine will be over cooled. (Temperature wise not style)
Is there such a thing as over cool?
What are the draw back of over cooling?
Someone please help. Thanks

 

As long as you have a thermostat, I can't see how you could overcool an engine. Years ago, on a piston engine (BB Chevy), I got caught when the weather dropped and didn't have a thermostat installed. Driving home I didn't have any heat and the gauge wouldn't come off cold. Naturally, if you installed a 4 core huge radiator and increased the volume substantially, it would take a lot longer to heat up the complete water system, especially on a cold day. The thermostat would keep opening and closing to adjust. My '89 TII has never, never gone over 1/2, hottist day with a/c on. I would say the factory cooling system satisfactory if in good condition.

 

Just wanted to add, if you did run without a thermostat, or a much lower stat, I feel wear could be more significant, and also the engine would be running richer.

 

Well, from what I learned in Mech class, it IS possible to overcool your engine.

Overcooling may be indicated by slow engine warm up, insufficient warmth from the heater, low fuel economy, sluggish engine performance, or a low reading from the coolant temperature sensor.

Overcooling can cause increased part wear. Because parts are not at full operating temperature, their clearances will be too great. The parts will not expand enough to produce the correct fit.

 

also, an engine acheives greatest effecienccy at a certain temp.