----- Original Message ----- From: [email protected] that is true of the heat, but the temperature will not change and if the antifreeze is able to prevent freezing at ambient temperature, the amount or air through the radiator should not make the temperature lower than the ambient temperature
REPLY Nobody said the temperature changed. Wind chill refers to heat transfer rate. As the temperature gets lower, anti freeze becomes more like a sludge. But it does retain some heat until low enough temps completely removes all heat contained in the liquid. Remeber it started out as hot liquid while engine was running. Left undisturbed long enough and it will chill enough to become solid assuming the ambient temp is low enough. At ambient temps close to, but slightly below the gelling point, the liquid inside the radiator remains liquid for a while after the engine stops. A short overnight stop is fine but leave it long enough and you have a problem when you start up again. The block will retain heat longer than the rad. The water jacket will still hold liquid coolant. So the engien starts. However if you now start forcing cold air through the heat exchanger, you will strip off the remaining heat of the liquid contained in the radiator real quick. Then you have a situation where the liquid has lost all the remaining heat and it gells. Now the liquid circulation path is blocked. If I had left the vehicle sitting until the sun warmed ambient air, it might or might not have happened. If the heat is added faster than the air flow can remove it the anti freze remains liquid. If heat removal exceeds the rate at which heat is added the liquid gels and eventually freezes solid. Boats with Frigo-Boat freezers have a similar but opposite problem. Under way the movement of the boat brings along enough cooler ambient water. But if the boat is anchored for a long time in still water, the heat dumped overboard by the keel cooler will gradually heat up the immediate surrounding water adjacent to the keel cooler. This reduces the effectiveness of the fridge/freezer system. Boats anchored in tidal waters with good water flow do not experience a problem but boats anchored in quiet lagoons with still water can. Its all about transfer of heat. how fast; how much. Arild
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