Quote Originally Posted by Turbocharged400sbc View Post
on a 3800 and most non mixer style cooling systems the upper hose is hot water discharge from T stat to radiator, lower is cold water supply to engine.

this is not always the case with newer mixer style thermostat engines, in this case it could be either way depending on packaging constraints
Yes, that's what I thought, but there is a few people I know that want to debate with me about this. They say I'm wrong and that it's the other way around.

I googled it and I got both answers for this question!