Will adding a thermostat increase my heating airflow.

[sidtheleaper28]

I've owned 2 beetle in my life and seen many others. Not once have I seen a beetle with the cooling thermostat. If in place, it should while closed increase airflow, you would think through the heater and defrost system?

[mukluk]

If you're talking about the 1965+ flap-style thermostat setup, then yes, airflow through the heater boxes will likely be increased to some extent while the thermostat flaps are closed. The earlier throttle ring thermostat reduces the amount of air permitted into the fan while cold.
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1960 Ragtop w/Semaphores "Inga"

[gt1953]

I will say one thing, the air will be a lot warmer/hotter. You will get more air flow when the the flaps are closed.
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Volkswagen: We tune what we drive.
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72 type 1
72 Squareback
({59 Euro bug, 62, 63, 67, 68, 69, 73 type ones 68 & 69 type two, 68 Ghia all sold})

[wcfvw69]

I've found reinstalling the thermostat and flaps makes a substantial difference in the heated air getting hot faster.

The other key factor is ensuring you're running the VW heater boxes, not the aftermarket ones that are about 1/4 as effective.
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[FL-Frank]

I added a correct thermostat to mine about a year ago, and it starts and runs so much better now! Definitely worth it!
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“Tinker Toy” 1967 Savannah Beige Beetle Sedan...........Mostly Original Survivor
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[Cusser]