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Message: <blockquote data-quote="wayneswann" data-source="post: 48131" data-attributes="member: 4311"><p>I've hooked up an aftermarket heater in this 246 cat and can't figure out why I'm not getting heat. Hooked it up the same as a 236b machine...one line right out of the water pump and one into the radiator where the sight glass is...that machine worked great. So my question is...in the pic where I have the one hose hooked up...is this the output or return? I'm thinking it's the output, but when I unhook the hose - it's not putting out antifreeze. Thought I have an air lock, but have tried to get all the air out of the system. I'm baffled.  <a href="http://img.photobucket.com/albums/v85/barndwellers_md/002-2.jpg" target="_blank">http://img.photobucket.com/albums/v85/barndwellers_md/002-2.jpg</a> <a href="http://img.photobucket.com/albums/v85/barndwellers_md/002-2.jpg" target="_blank">http://img.photobucket.com/albums/v85/barndwellers_md/002-2.jpg</a></p></blockquote><p></p>