Froozen up.

Seriously ? The line that goes towards the firewall

I've been up here in Canada for 2 weeks now and my poor truck just isn't cut out for this cold either after spending most of its life in warm weather.
Poor air dryer spits so slooowwwww, but works better after the engine warms up.

 

The intake will come off the intake manifold or air filter with a rubber hose .The outlet will go under the cab to the air tank.

 

outlet should be a braided stainless steel hose

 

I had to tap on the air governor a few times to get the last truck to build pressure

 

Yup, they do that if the discharge line is plugged. Loud popping, almost like a making popcorn, but louder.

 

If you're pretty sure you know where the problem is get a couple of milk jugs filled with hot water and pour the water on that item/area. Worked fine when I had an air dryer froze up.