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Message: <blockquote data-quote="Tazza" data-source="post: 9459" data-attributes="member: 82"><p>The core in my car did that, hot in cold out. The core was blocked inside. If you can get it out, you can try hooking up the garden hose to it to remove as much as possible. You may even be able to do that without pulling the core just attach it at the engine, try different directions too to try and dislodge the gunk (if there is any). Hopefully it doesn't have a 1 way valve.</p></blockquote><p></p>