Dry Coolant System Pressure Test Had Anyone Done This?

[Trevin]

I just got my motor assembled and I want to make sure nothing is leaking. I hooked up my radiator and hoses and pressure tested it. I cannot get it to build pressure past 9psi. When I test for leaks I get micro bubbles when I spray soap and water in some areas around the thermostat housing gasket and some areas around the water pump gasket. Is that normal? Or will having coolant in there make the gaskets seal better? Just wondering before I put the motor in the car.

 

[jcgafford]

Fill it with water and retest.

 

[7991LXnSHO]

I am afraid the water will bubble out if air leaks. You might as well replace that gasket and use sealer before making the job messier.