Core was replaced along with new radiator and upper and lower hoses last year. Two months ago, smoke from vent and then nothing - no heat, no water under dash, and blower appears to be working. Water is circulating
Any ideas why no heat? Oh yea, themostat was just replaced as well

 

Kinda stupid question, but did the smoke smell burnt at all? If so I would go with the blower motor.
Does the blower motor still blow like it did before?
Was the smoke more like steam?
If so bad heater core.