Guys think about it a while... Even if the heater core was leaking it would put out HEAT! There is coolant flowing thru the core all the time. Unless the core is stopped up..which is highly unlikely in a modern core. So if no heat either the engine is cold.. which would be a thermostat, or the heater temp gate isn't working as designed..
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist