by Richard Miller » Wed Jun 08, 2016 3:52 pm
hi Gord .. now that I think about it I am pretty sure that your problem is just trapped air ,, picture a side view of car and any where the coolant goes up and back down there is a high spot that can trap air ,, top of radiator ,, high spot of engine (if it is tipped back , angled down toward rear , that should be at front of manifold) .and both pipes where they go over the gas tank ,, now if there is a radiator cap on the radiator and on the stand pipe there is one other consideration ,, crown used to say solder the one on the radiator shut ,, don't know if yours is ,,, the return to engine where it goes over the gastank does not have a bleed as I understand it,,so you can fill at top of radiator , at standpipe and bleed at top of engine ,, but that leaves that one high spot in the line going back and because the pipe dips down the engine bleed wont get it ,, adding a small fitting at that spot will allow you to clear it out , now if you have two radiator caps realize that whichever one has the lowest pressure setting will open first and set system pressure ,, get two different ones say 16 and 22 ,, put the 22 on the lowest spot and the 16 on the highest spot ,, that the high spot will be the one to open and hopefully any air trapped there will bleed out when system pressurizes ,, but here is the important part of having two caps ,, they are not calibrated for when they open (at atmospheric ) as the system cools down ,, recovery may not be at the same cap that opened to let out pressure ,,, so they all must be connected to a recovery tank with coolant in it ,, if possible all to one tank ,, that way all fluid vented will be returned on cool down ,, realize that every time you run the car and the system heats up it will vent fluid ,, and cools down it will want to recover that fluid ,, it breathes in and out with every heat cycle ,, get your leaks fixed ,, the caps set and all connected to a tank ,, and bleed that high spot , you should be good,, and if I am wrong it wont be the first time ,, but good luck ,,waiting to hear that you are successful
Richard Miller
West Covina, Ca
'65 V8 Vair