Given that your buddy isn't sure on this one, I'd just run some antifreeze through it. I've done this one of two ways. 1. I just popped the intake hose off of the through-hull fitting, and rigged up a fitting to a bucket of antifreeze. 2. Now I have a fake a lake, and it simply sucks antifreeze through a short hose out of a bucket. I've never been comfortable that I was getting the trans completely drained. Before I run antifreeze, I drain the block, manifolds, and trans cooler. While I have the hose to the trans off, I stick my shop vac in there to suck out what I can. I know it's probably over the top, but it beats the alternative.
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