You want it going through the rad if you live in a cold climate. The fluid should be at operating temp. and the rad. can help warm it up in winter. Some say in hot climates its better to just use the aux. cooler by itself.
Citing leaks as a reason not to run to the rad. is lame. That would however be a good reason to do a better job next time you install something.
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2002 GT
1993 GT (SOLD)
'93 Mustang GT
RHC member #142
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