Not enough heat

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quandoomniflunkusmoritati
Ever since I've had the car, the heat has never been that great. The blower is not that strong but that seems to be a problem a lot of people have. Since it has been sub zero temps out for the last week my interior has not gotten comfortably warm. The engine warms up fine, and the gauge reads nominal but there never really is hot air coming out.

I had the coolant system flushed when I first got it but other that no other work has been done to the cooling system.

My question is how do I properly burp the system? I can hear the coolant cavitating in the heater core when I'm accelerating so I'm thinking there is just air in the system. Thoughts?

2001 town car signature series 198000 miles.
 
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