Originally Posted by "SI"ngle Cam

I am thinking of purchasing a truck from my parents to help me with my move. The heater core is leaking, so I have two questions and yes I know the first one is stupid.
1. If the heater isn't running does the coolant flow through the core?
2. Anyone had to switch one out in one of these trucks before? How big of a pain is it? I haven't had a chance to go look at a manual yet.