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Heater core issue...or is it working fine?

I'm having what I consider an issue with my heater core, but it could also be a known issue with Panteras. As a new owner, I have nothing to reference if this is normal or abnormal.

When I turn on the heater the air blows at ~100 degrees F. After 1-2 minutes the air temp starts to drop and finally settles around 70 degrees F. Now 70 degrees isnt "cold", but it's certainly not very warm in the Colorado winter.

Any thoughts on why this is happening or how to fix it? What happens if the heater input/output tubes are swapped, can that cause this problem?
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