how many psi should that cap hold? the had a 13 and a 16psi and they gave me the 16. reason i ask is my upper radiator hose has so much pressure in it it looks like its about to explode. i dont knopw if thats normal or not but im thinkin its not. could my water pump not be pumpin or did they give me the wrong cap?? kinda havin the opasite problum now befor i would pinch the hose and thered be nothing in it now i cant even pinch it cuz it looks like it will burst.