98 Navigator Transmission radiator replacement

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Stan

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Hi Guys,

I found, that my transmission oil radiator and it's neighborhood is a bit wet (think it is fluid). I washed it with the engine washing solution and high preasure water jet, and now I'll be checking if it returns. If so - then I would have to replace the cooler.
I found of ebay, the Derale universal coolers in various sizes, and they also have a fitting sets for specific cars (including Navigator). So i presume that I can use it right ?
Any of you had problem with such leak ? Is it any other solution (like maybe hoses/fittings seals replacement or so?) I can't tell at the moment where is it from (radiator it self or plugs/hoses).
Mechanically I will handle but - how do I remove air from the new mounted radiator afterwards? And I suppose I would have to add the oil to the right level (manual for the cooler doesn't say so)... What fluid should go there - I thing ATF but it is red and my leaking fluid is very light yellow (similar in color to the olive oil:) - so should I replace a whole fluid?

Also - when starting with worm (hot) engine, for the first minute or two I hear strange sound coming from the passenger side from under hood. It rises with RPM's, and shows when RPM is higher than 1500... After minute or two it disappear. This happens only when warm - on cold engine there is no such problem. Could it be related to my suspected transmission radiator leak?
 
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