The only time I have seen a cap not open and what it did the system blew a hose because of to much pressure. If you put a cap on there with a little higher tension then it will run a little hotter but once it opens then it go to the over flow tank. The hight the rating on the cap means it lets the system build up more pressure which allows the coolant to get to a higher temp before boiling.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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