Just reading this after working on one of my Freightliners and wanted to comment that it has a York compressor running 134a and cools quiet well. They have a very large engine fan that does have to kick in a lot to keep the head pressure down. The engine fans on large trucks free wheel when not needed to cool down the engine or a/c.
The Yorks hold up well IMHO. I do like R-12 in my cars rather than 134a.
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1980 300SD Manganese Brown Metallic Clearcoat 248k
1979 300SD White 148 k
1984 300D Silver project car for daughter
1982 300D wrecked
1980 300SD 310K not running
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