2000 Chevy Venture heat
My Venture blows cold air. It is not the thermostat? How can I tell if it is the heater core or a cracked head?
Have the cooling system pressure tested by a mechanic you trust. This will eliminate the possibility of a cracked head or internal leak. Most likely it is not the heater core, but perhaps a blend door in the system, or an improper mix of antifreeze/coolant. How do you know it is not the thermostat? The climate control systems on newer vehicles are quite complex and you will likely need to have a mechanic diagnose this problem to be certain.
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