05-18-2018, 02:29 PM
The only way I could conjure is is the converter is active, as I described above, otherwise heat generation in the transmission will be no greater than it would be under power going up a hill of similar slope to the one being descended.
However, there is one other way it could potentially happen. If, as Chester suggests, the engine is coasting in no fuel condition it will generate little heat from combustion, but there will be heat from repetitive compressing of air in the cylinders from the Jake activity. All that heat, approximately equal to the heating of the brakes if they were used instead, has only one place to go, out the radiator via the coolant. That could mean the coolant could get hot and the trans temp would rise. But, if it did that the fan should kick in due to the controller reading a high temp in the coolant. I think I just talked myself out of this one.
2nd however, if the trans is equipped with a retarder then a long descent would produce a hot trans. I couldn't talk myself out of that one because the heat is being generated in the trans itself.
However, there is one other way it could potentially happen. If, as Chester suggests, the engine is coasting in no fuel condition it will generate little heat from combustion, but there will be heat from repetitive compressing of air in the cylinders from the Jake activity. All that heat, approximately equal to the heating of the brakes if they were used instead, has only one place to go, out the radiator via the coolant. That could mean the coolant could get hot and the trans temp would rise. But, if it did that the fan should kick in due to the controller reading a high temp in the coolant. I think I just talked myself out of this one.
2nd however, if the trans is equipped with a retarder then a long descent would produce a hot trans. I couldn't talk myself out of that one because the heat is being generated in the trans itself.
Jon Kabbe
1993 coach 337 with Civic towed