Found a factory 91 C K shop manual. No mention of any aux cooler. Did have
some info on the in-radiator engine oil cooler:) The thing I originally read
was a packet of amendments. Had stuff about installing a trailer hitch,
trailer brakes, how to run the wires for two way radios and so on. The
chapter I tried to quote was in the towing stuff. When I get some time I'll
see if I can find it again.
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