Hi guys i have a old Cal Spa 1992, I just replace the spa pack with new motor. I filled the tub and turned everything on and you hear the heater click in and all these air bubbles come out of the jets and then the heater turns off. It does this about every 2 min. I know I have an airlock but I can't seem to get all the air out. I open the the bleed valve and air came out, i have done this some many times i can even count and I still can't get the water to flow and the heater to stay on. Need some help!!

Thanks
Nick