I have antifreeze smoke coming out my heater vents. I just replaced the heater core, and its still happening. Yesterday the problem actually quit altogether. But today, the same problem came back, so I had the heater core changed. But its still smoking from the vents.
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Sounds like a bad heater core. You will get steam/vapor out of vents from this. If you are referring to the over flow tube being the evaporator drain tube at the firewall its because the heater core shares the same case with the A/C and its filling up with anti-freeze.
This sounds like a blown heater core or heater hose. If you smell antifreeze and/or see a puddle under the car or on the floorboard, you would most likely have a heater core gone. This can be a time consuming repair due to the fact that the core will normally have to come out under the dash area towards the floor.
The fluctuation in the temp gage indicates a low coolant situation. The smoke you see from the defroster vent is actually antifreeze that is leaking from the heater core somewhere and as the antifreeze evaporates from the heat it causes a vapor to produce. You should smell a very sweet smell when you see the vapor. If so it is definitely antifreeze. Find the leak and fix it. Then refill your coolant system to specs and you should be good to go.
You have a coolant leak most likely in the heater core. Try disconnecting your heater hoses and coupling them together, then running the engine to see if the leak goes away. If it does, I would have the heater core replaced.