Chevrolet: antifreeze, psi test, rad cap

Question
I had an intake manafold gasket replaced and pressured tested 3 times and everything is fine . now i need to replace antifreeze maybe a litre every 6 weeks . can you help, thanks.

Answer
HI Richard;
     Well you had a psi. test and you had no leaks thats good,  how is the rad. cap ?.it might be leaking when you get warmed up, or is it the wrong size ? if you think you might have a small leak you can put in a can of BARS rad. sealer as I use it , its great stuff for small leaks. and it will not hurt anything.That should do the trick ok.
Good Luck