2001 Dodge Neon Heater Stopped Working

I have a 2001 Dodge Neon
While taking my son to school the heater stopped working blowing only cold air. Got to work and then drove to get some lunch on the way back it started dinging and thermostat went to H. I got it home took a half day and taking it to a mechanic tomorrow. Any thoughts of what it could be?
While taking my son to school the heater stopped working blowing only cold air. Got to work and then drove to get some lunch on the way back it started dinging and thermostat went to H. I got it home took a half day and taking it to a mechanic tomorrow. Any thoughts of what it could be?
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Comments
Hopefully, no serious damage. Next time, when the gauge goes to Hot, shut the car off and call a tow truck.