Thanks for the info Paul! Both lines to the heater core are hot. Its not that it never gets warm....it does, then after a few mins gets cold and stays cold until I turn off heat and restart the process, or turn car off.

Im wondering if I have air in the system, bubble maybe? If I squeeze on rad hoses, I get heat. If I stop squeezing, air turns cool again. How do I 'burp' the system?