I too use the expansion pressure cap on the recovery tank method, although, there are many who will tell you that is wrong and the pressure cap should always be on the radiator. Air bubbles are prevalent in this era of Morgan cooling and the above method is a good way of dealing with them, it also means all the fluid filling and checking of levels is done at the recovery tank. The system will burp air and fluid out of the recovery tank finding its level, works a treat.
| 
