It sounds like you have air in your cooling system - lots of it if the engine is revving as you describe. Search for "bleed cooling system" for plenty of info on the procedure - it only takes a 10m wrench and a few minutes.
The bad news is that air is getting into your system somehow. You need to remedy this quickly before you overheat and get a blown head gasket (if you don't have one already)......for lots of fun on that subject, search for "BHG"...
It could be something simple like a radiator cap, leaking hose, busted radiator, leaky water pump or other such simple things....I hope that is the case for you, but please get it checked out ASAP.
Don't think because your temp gauge is normal that you can sleep. Once your temp gauge starts sketching out - that can mean you already have a serious issue.
The bad news is that air is getting into your system somehow. You need to remedy this quickly before you overheat and get a blown head gasket (if you don't have one already)......for lots of fun on that subject, search for "BHG"...
It could be something simple like a radiator cap, leaking hose, busted radiator, leaky water pump or other such simple things....I hope that is the case for you, but please get it checked out ASAP.
Don't think because your temp gauge is normal that you can sleep. Once your temp gauge starts sketching out - that can mean you already have a serious issue.