I keep haveing to add anti freeze to my car and I never see anything leaking. Today I pressure tested it and found that it wasn't looseing air but it was adding air. Could this be a blown head gasket?

 

If the head gasket was blown you would have known by now because there would be oil in the coolant and coolant in the oil.

 

O damn. Does anyone know what it could be?

 

Go to your local gas station and pick up some radiator stop-leak. Add 2 bottles of that stuff and you'll be money. I just had the same problem as you and this fixed it!

 

>>Today I pressure tested it and found that it wasn't looseing air but it was adding air.

It's not clear what you're saying. Are you referring to using a compression test gauge and the reading is increasing?

Irregardless, I wanted to add that yes...most times you get cooling/oil mixing when a gasket blows or develop a head or block crack, but it's not ALWAYS the case....

It comes down to what part of the gasket gives up - My Silverado blew the gasket between the exhaust port and coolant jacket. It never leaked, much like yours, but would 'burn off' the coolant and push it out with the rest of the exhaust gases....

It would also 'bubble' in my radiator and eventually blew the radiator tank seals, since it was also pushing hot exhaust gas into the cooling system...

HTH....