Generator drive B737CL

[techno]

4 Generator Drive Oil Temperature (GEN DRIVE OIL TEMP) Indicator
Displays the temperature of the oil used in the generator drive.
IN scale (inner) - Displays the temperature of the oil entering the generator drive.
RISE scale (outer) - Displays the temperature rise within the generator drive.
•Higher than normal temperature rise indicates excessive generator load or
poor condition of the generator drive
Вопрос здесь:
•Lack of adequate cooling will generally cause the temperature RISE to decrease.
Как оно устроено, что при отсутствии достаточного охлаждения оно остывает???:confused1:

 

[310]

May be this means that with insufficient cooling of incoming oil temperature difference between IN and OUT becomes smaller. This may appear if RISE shows not absolute value but percentage.