There is a pressure release valve....take note...this can be very dangerous!!!
I had done the same thing as above with the fix a leak kind of stuff for the a/c. Car got hot one day and the AC oil blew out the valve....when it did this, it hit my manifolds and all I saw was flames coming out my hood. Luckily I had an extingusher and no damage was done. So if you have a leak don't use that fix a leak stuff...if you saw the pin hole the oil has to go through...you would understand the pressure that is involved.