Get a thermostat , cooling requires time!
Bubbles , you either have air in your cooling system or headgasket problem , feeding back crankcase pressure into cooling system. Start the car cold with the rad cap off get up to operatiing temp, holding throttle around 3k rpm , once your thermostat opens you should get a flow , throttle the engine and watch for bubbles , burp the cooling system of air you should have a bleeder screw on the neck 10m open it wait for fluid and tighten. Let cool down remove rad cap ,start car hold throttle at around 2.5 rpm and if you get bubbles you have Mild HG problem that could blow a rad , hoses and more.
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