Rick, based on what I have read you would have to really heat that baby up to get hot oil to circulate through the cooler. The oil filter housing has a thermostat that will open up and circulate oil through the cooler when necessary. The wording in the manual is: "At an oil temperature of 110 dC or 95 dC, depending on thermostat installed, a distinctive increase of oil temperature on oil cooler should be noticable (manually)". It goes on to describe how to test the oil cooler thermostat but you have to have something called a Telethermometer (p/n 116 589 27 21 00). I imagine that during this time of year your oil is probably not getting hot enough to require the cooler.

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Jim