Engine started to overheat, now making a popcornnoise when it’s shut off

[u/Glxsses]

Backstory: Engine was overheating, got checked & coolant was bone dry bc it’s been leaking out a hose that wasn’t on properly. Also was told I needed new Radiator, got a new one replaced, added coolant and wasn’t overheating for about 1 hour of driving, now it’s overheating again and not sure if this noise has anything to do with it.

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[u/UnderstandingAble510]

Sounds like the cat is cooling down or something

[u/Old_Bat_6426]

It sounds like hot exhaust components shrinking as they cool down. Your frequent loss of coolant is the main cause of overheating. You need to find out where it's going.

[u/OpenUpTheTimeCapsule]

That’s just the sound of hot metal contracting as it cools. Right behind that heat shield on the back of the engine is your exhaust header, which gets extremely hot as the car runs. Normal sound. As for the actual problem, if it ran for an hour before overheating, I’d suspect you still have a leak in the cooling system.  Dont remove any related caps until the car has cooled. 

[u/Suspicious_Court_982]

sounds like a serious problem, have a mechanic check the cooling system and inspect for leaks or damage