No Heat

Mike, It is possible that the thermostat is stuck open. Other possibilities include low coolant level, bad head gasket, a bad heater core, or your heater controller might not be getting vacuum from the engine. Miles on it and what engine is in it will help in diagnosing it and also knowing of any problems that are more likely with some engines. I'd check the coolant level first and be sure that if you add coolant that you do it with the engine cool and bleed the air from the cooling system.

Hope this helps some. If it causes more questions don't hesitate to ask because someone here will know the answer.

Tom