Why did you take the heater boxes off ? You will be looking for them next winter. Every little bit counts in the heat department
BLOCK THE OUTLETS OFF AT THE FAN HOUSING . NO RAGS NO DUCT TAPE Unless you sign a contract with me to rebuild you engine when it melts down.
Those ports in the housing are outlets not returns.
If left open about 60% or more of your cooling air blows outdoors and not over the Cyl.'s . Not a Good thing.
