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Hey guys, I'm new to the site and have a heater question. I bought an 89 YJ a few years ago and the heater worked great. This spring I overhauled the engine. After the over haul my heater hasn't worked. It's blowing cold air and it seems like the hoses to the heater core aren't flowing any coolant??? I had the head rebuilt, new rings, bearings, radiator, water pump, stat and can't figure out how the heater just stopped blowing hot. Any thoughts would be appreciated. Thanks