No air at the dryer control line?

[caz]

Got my new AD-9 installed and it didn't purge. I ran it with the control line off and got no air out of it at any time or pressure. I can add air at the port and it purges just fine. I cracked the line at the governor and sure enough, right around 120psi, it started hissing so it's working like it's supposed to.
Is there a solenoid or something that might be stuck? The schematic I looked at doesn't show anything in between the governor and control port on the dryer. My next test is to tap in at the governor and run a hose out the bay directly to the dryer to see what happens. I'm just trying to make sure there's not another point I should check before I call it an obstructed line and replace the line.

Thank you in advance 

[bevans6]

can you blow through the line?  Absolutely no question you have the right line at the dryer end?  Did the old dryer purge?

Brian

[caz]

Blew air in the line, nothing, air came back out where i blew it in. Definitely the right line.
Never heard the old one purge, which I'm now finding is probably why the desiccant in it turned to sludge, froze, and blew the factory dryer up last winter.

[bevans6]

that line is most probably a pretty straight run of 1/4" copper.  Maybe you can run a fish tape through it, if you had one small enough with no hook on the end?  No obvious blockage point that you can see?  You checked the flex line at the governor end?  I don't know if the air dryer end is a flex line or hard line all the way to the air dryer port.  But I guarantee that changing that hard line is a non-starter...  so clearing the blockage is the way to proceed!

Here is an idea outside the box - get some fittings together, fill the line with water, when full switch to a grease gun full of water and hydraulic the line clear - a grease gun with water can develop several thousand PSI.

Brian

[caz]

Flex hose at the governor is good because it's getting air into the rear copper lines, I checked that. The hose on the dryer end is a new one that I just had made so it's good. If it's supposed to be a straight shot from the governor line then it's blocked somewhere. If I could isolate which line it was in the bays I could check at each fitting point but there's no telling with 10 or more gray painted lines running through there like they are. I could fish another copper line down the center just fine, there's plenty of room and I have the know-how, but it's a time consuming prospect so I want to explore all other options before I do it.

Never thought of the grease gun thing... I might try that

Thanks!