Air flow in an HVAC system is always circular. In the return air grills and out the supply registers. If the unit is upstairs and the ductwork goes down stairs then the supply would travel down and the return would travel up.
Air in the system. Bleed the cooling system and remove any trapped air pockets.
It can prevent coolant flow, which can cause a catastrophic overheat.
The air conditioning is a separate system from the cooling system and will not be affected by overheating, however if the overheating problem is associated with an inoperative cooling fan or a blockage in the air flow through the radiator and evaporator then the system will not cool properly.
Return air vents in a typical HVAC system are usually located on the walls or ceilings of a room, allowing air to flow back into the system for heating or cooling.
Ceiling fans are great for upstairs in the winter. As one reverses the switch after being used in the summer to whirl the air for cooling. Reverse the switch to tell the fan to push the whirling up so that the heat at the ceiling will flow downward to give some heat to the room upstairs or downstairs. Happy whirling.
Engine cooling system is not a closed system you can't remove the air.
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Lack of coolant, lack of coolant flow, air in cooling system, lack of airflow over radiator,........
Engine cooling system is not a closed system you can't remove the air.
Air bound means that there is an "air bubble" in the cooling system that is preventing coolant from circulating in the cooling/heating system. (air can be compressed fluid cannot)
I have two separate systems, one up and one down. The downstairs unit does nothing to cool the upstairs. It is probably because cold (heavy) air sinks and hot (light) air rises. To have any effect on the upstairs, you would need a very well insulated house with few windows, and you would have to make it extremely cool downstairs. Inversely, you can use your upstairs system to help cool your downstairs, for the reasons explained above. Since hot air rises, your upstairs system has a larger cooling capacity than your downstairs unit to take care of the larger demand.
air will flow through across cooling tower