I was running car to get it warm... smoke... yeah probably from the oil left over from the original leaky head gaskets. I can’t see any further leaks. But back to the coolant. The engine is hot - it’s the first time I let it idle so long and it seems very hot. But the heater core hoses were still cold and so I wasn’t getting bubbles from the bleeder hole. After stopping, the heater core hoses are finally hot, so I guess the thermostat finally opened? Anyway, any tips on this please help! I’ll start the engine again and see if the now hot engine spits out some air... it’s normal to get hot enough to see old oil burning off, right? The rad hoses also finally feel hot.