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I am not at all a car expert, not even a little. I am a girl who just happened to run into this exact same problem less than one week ago. I took it to the service station and $89.00 later they told me the problem was the car had no antifreeze left. So they topped it off, handed me a high bill, which comes with being a girl who knows nothing about cars, and now the heater works perfect, running and when it is in idol.
Maybe that's it. If it is you can check it yourself by looking right under the hood. Antifreeze, according to my bill costs $6.00. Save yourself the money and fill it yourself.
I think 73happn'd hit the nail right on the head. You need full coolant for proper heat.
A continuous flow without air pockets is one of THE most important things.
When's the last time you had a cooling system flush and pressure check??? Very easily neglected.
...and life73, you need to find where the missing coolant went. Water pumps and radiators sometimes only show up leaking when the engine is fully warmed up. That's a good place to start looking.
Good luck, ya'll.