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Try a piece of 1/8" black rubber sheet from a hardware store. Block the front of the oil cooler and tack it on with a little black duck tape. It was recommended to me and works like a charm. 
Blocking Air Flow to Oil Cooler
It also blends in so you don't even notice it.
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Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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