Hmmm...air leak.

[dhirocz]

So I have an air leak that seems to be driving me nuts.

This is what I know: it leaks down from both the primary and secondary side at the same time. It will leak down fairly quickly (down to 50 psi overnight). It is not audible nor have I found it with the soapy water spray test.

In the last couple days, sitting in the truck while getting unloaded/reloaded, I hear a gurgling sound after the truck has been off for about 20 minutes. Sounds almost like air bubbles in the coolant but it is coming from the driver's dash/firewall area(where the bulkhead for the air lines come in to the cab) Turn the key back on and I went from 120 psi down to 70.

I have recently also heard this walking away or to the truck lately as well. Sounds sort of but not quite like the dryer...which has already been replaced and would have been off anyway.

Since it's not constant, I doubt it is a line itself, probably a leaking valve somewhere in the air system. I'm wondering if maybe air is leaking back towards the compressor...what do you guys think?