Keep the radiator cap loose to help the air move out during this process.
Air cooling system diagram.
The cooling system used on the most known air cooled engine the vw beetle air is drawn into the ducting by the fan and passes through an oil cooler before flowing over the cylinder heads and barrels.
The air is sucked into the engine compartment through a tunnel that runs beneath the rear shelf.
This puts your radiator higher than the rest of the cooling system and helps force the air pockets closed.
Open the valve and bleed the air trapped in the upper portion of the radiator.
You can also jack your car to bleed the air from the cooling system.
The system needs topping up from time to time.
A radiator pressure cap is designed to maintain pressure in the cooling system at a certain maximum pressure.
Once the engine has cooled off a negative pressure begins to develop in the cooling system.
An air handler is usually a large metal box containing a blower heating or cooling elements filter racks or chambers sound attenuators and dampers.
Another air cooled engine design this from the fiat 126 and fiat 500 engines.
In a cooling system of this type there is a continual slight loss of coolant if the engine runs very hot.
If the cooling system exceeds that pressure a valve in the cap opens to bleed the excessive pressure into the reserve tank.
As this liquid passes through the hot engine it absorbs heat cooling the engine.
Air handling unit ahu.
Later cars have a sealed system in which any overflow goes into an expansion tank from which it is sucked back into the engine when the remaining liquid cools.