Thanks for the reply 'Greasel. I figured it was logical that the radiator had a temperature drop between its top and bottom. It's also logical to assume coolant is pulled from the bottom and filled from the top; why fight gravity if you don't have to?
I've also noted that the radiator fan is always spinning. As thought the fan clutch isn't "clutching" as one would expect.
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Jim
1985 Volvo 740 GLE turbo diesel 
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