Newbie question. 555 radiator pressure test

Me again folks

Strongly suspect that the rad has a leak in the bottom of the upper tank. Radiator is removed and am rigging up to pressure test it. was wondering what pressure i should take it up to.

Thanks again

John
 
Since its a 4 psi system I wouldn't go past 6 psi. If you have trouble locating the leak there is a UV dye that you can put in the radiator with the water. Most auto parts stores should have a UV kit for cooling systems.
 

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