You need to add a header tank into the system, it's the onlt way forward
A good location (if you don't have ABS) is the spot where the ABS pump would go.
A simple closed header tank goes here. To this you connect the top "vent" of your swirl pot as well as a connection from the radiator overflow hose (the overflow bottle is ditched)
You then Y the bottom of the header feeds bacl into the bottom radiator tank
If you have an alloy rad then there are other possibilities, as demonstrated on the WRC cars
They use the (metal) radiator and a 'slightly modified' metal piped cooling system routing to provide natural air collection points without using swirl pots. This still requires a header tank however
There are other spots that the tank can go but the ABS pump location is favorite as it's a convenient connection spot for the feed back into the system. The other requirement is that the top of the header tank needs to be above the highest point in the cooling system (top of the rad)
Other options would be on the bulkhead somewhere - the tank does not need to be huge, a liter should suffice but bigger is better
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