LLY: pressure testing twins question???

[dieselboy04']

I made a pressure tester for my twins to chase down leaks. while trying to do so I noticed a bubbling sound. why would air be getting in to a liquid while pressure testing? head gaskets? spun gear in the water pump? I'm at a loss but wanna get this fixed.

 

[DAVe3283]

Can you track down where the bubbling sound is coming from? That might help you find what liquid it is getting into, and then how it is doing it.

 

[dieselboy04']

it's hard to really pin point. sounds kinda like the center of the motor more towards the front.

 

[cafryer]

Mine does the same thing but i never payed it any mind.