Hello all,  anyone have any info and how to make or were to buy "cap" needed to pressurize the system and looks for leaks?  My 91 has been running hotter than normal for a while and I smell coolant at times but haven't found any obvious leaks.  I had the cooling system pressure checked in May and it came back negative but I don't think he did it long enough.  I want to pressurize it for a few days and look for leaks.   Thanks, Marcus