ADDING COOLANT

if you drained the radiator it's a long process. you need to remove all the dress up around the engine, unbolt the reservoir and remove the air filter cover until you can remove the bolts holding down the hose that goes under there. you should be able to put the reservoir on the hood latch, remove the bleeding valve on the reservoir. it's a long annoying process. from there you just fill it up to the full line and turn the car on, filling it up while the engine takes the coolant down-

Sure it sounds like you have a blown head gasket or the water pump is leaking which can come and go. Here are two guides to help you see what's going on.

https://youtu.be/GSE9skKnOgY

and

https://www.2carpros.com/articles/car-is-leaking-coolant

and

https://www.2carpros.com/articles/head-gasket-blown-test

Please let us know what you find. We are interested to see what it is.

Cheers, Ken