Quote:
Originally Posted by particlewave
Where did you read that nonsense? 
Yes, it affects both and that is likely your issue.
Look through your center vent with a flash light and you'll see the heater core flap. Cycle from cold to hot and watch it to ensure that it has a full range of movement. If it does, fix your missing flap foam.
Interior vent debris
. |
If that’s the issue that’s good to know. I looked through the vent and I don’t see any movement from the flap. I’m guessing that’s a separate issue I’m going to have to resolve?