Radiator cap 1.1 or 0.9??

[rasmeidirt]

Updating: Test drive with the 0.9 bar rad cap with no problem at all. Just be watchful with the overflow bottle to add up!!!

Update: By chance. I come across a rad repair shop and see the 1.1 cap and grab it to change it!! You know just one cap from rockauto.com is only  more than 2$ but the shipping is 45$. That is why I decide to use the 9.0 cap now I found it in the country just for 2$.