[geeteeohguy]

Also, 100 psi pressure is a bit much to pressure test. Normally, 50 psi is used. Another trick is to use a smoke tester, which generates smoke into the system and will exit through the leak. VERY easy to detect system leaks this way.

[buddy in texas]

Originally Posted by geeteeohguy

Also, 100 psi pressure is a bit much to pressure test. Normally, 50 psi is used. Another trick is to use a smoke tester, which generates smoke into the system and will exit through the leak. VERY easy to detect system leaks this way.

Thanks for your help.

[LATECH]

Hard to pressure up smoke to 50 psi, let alone 100 psi.Not sure how this would be done.
You can as suggested, pressure the core to 100 psi which is the pressure a fully charge system has when it is not running . When the system runs, the low side dips to around 30-40 and the high to around 225-250 .
Plug one end, Hook up one end to an air supply and dunk it like a tire...in a tub of water, or spray it with soapy water and look for bubbles. Slow leaks will make real tiny bubbles.
Smoke machine is very good for checking airflow leaks in your ductwork as it is safe, leaves no odor and is easy to spot. Ductwork needs to be sealed tight , especially in the underhood evap case as loss of airflow is a complete step backward.