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Hope the opportunity comes up that the truck is maxed on GVWR or durned close to it at some point that we can "see" what the ambient temp / truck work "slope" appears to be. Same for EGT's. Where the blocks need to be altered or removed.
As an old RV side note, one of the reasons Chrysler added a power steering cooler to the Trailering Package and Police Pursuit TNT-440's (plus Marine & Industrial 440-3 engines) in or by the early 1970's was that horsing a trailer around to back into a tight spot in sub-freezing would cook the PSF without airflow, but even a bit of rad fan operation would bring it back down.
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