Engine coolant;?

i have a 2001 saturn sl2 and i recently changed the radiator and hoses and drove it from about 150 miles on saturday got to my destination and level was fine, drove back home and next day the level way low so i filled it up? could it still be finding airpockets? there are no leaks under the car except for a.c run off
Engine coolant;?
I'd guess an air pocket. The car has to heat up and cool down a few times to find them all. There may be a bleed valve (as someone above said) and it would be in the Chiltons or Haynes manual.
Engine coolant;?
You may have an air release on the top of the engine block somewhere. Sometimes it's just a little machine bolt and sometimes it looks like a grease fitting and you can release air with a small tool like and awl or a nail.
Just keep an eye out for leaks -for few more days (or a week or two).. It sound like an air pocket, but you never know.





Good Luck...
Your suspicion is right on the money.



Your coolant found all the air pockets and the level was a bit low.



If it continues to occur, something else is wrong.