Coolant coming out of the radiator cap!!

[Juggernaut]

I'm once again turning to you guys here on the forum for some advice. I had to drain some coolant out of the radiator (aluminum)to have a small pinhole leak repaired, I guess it was from a small rock.

After the leak was fixed, I filled it up with coolant by adding coolant through the filler neck until I could see it. Then I started the car with the cap off & when the thermostat opened & I could see the flow, I topped it off to the bottom of the filler neck. I then put the cap on & filled the overflow bottle about 1/3 of the way up. This worked good the very first time I did it.

The car was okay idling but when I would drive it would run a little hot. So I decided to bleed it again. This time, after the thermostat opened I would see coolant flow nicely then all at once I'd get a big "tidal wave" of fluid puking out. It would then go back to a steady stream & then the tidal wave hit again.

Out of frustration I just put the cap back on & called it a day. Today I let it warm up, drove it for maybe 10 minutes & it puked coolant out from the radiator cap. It's a brand new 13 lb. cap. The engine is a basically stock 289 & I never had any problems like this before. I alwaays ran a 13 lb. cap & had no problems at all.

I'm thinking there's some air pockets in it, am I on the right track??

Thanks!