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sounds completely normal to me. plug the line not the AD9 and test again. you will have to vent the air somewhere else to trigger the governor, it should turn on compressor near 90 and then turn it off near 120. that looks like a wrong gauge to me since normal is 90 to 120 gauge should read...

why does the other small line not go to the control port on the AD9? i looked it up and that is what is called for, pressure on control port when compressor is shut off to tell the dryer to purge. that pressure stays there until governor on firewall removes pressure on unloader. of course if...

you cannot make any kind of decision just guessing!! you need to know exactly where 3 and 4 go.

OK i thought maybe that dryer sent signal to compressor to unload. i see it does not. it works exactly like mine, only accepts pressure to cycle. so that diagram is correct for yours and mine.

i think the diagram is correct. that is exactly the way mine is. the control valve on firewall now has dual purpose. 1 to put pressure to compressor un-loader valves to stop pumping air. 2 to signal air dryer to cycle and vent air first in a burst then in slow manner to expel all water. you...

thermostat is built in mine

just remember that line is not fused at all, so add one at the drier.

well, this may only help a little, but go the the website listed below and click on 'our trucks' and click on the m-621 page. i have not drained the tanks in 8 years because the drier gets it all!! unit is from a UD (nissan) box truck. tom

but we are talking about vehicle air dryers and neither of these are used. the only common type is the pressure cycle type where beads readily absorb moisture from pressurized air and release almost all of it when the pressure suddenly drops. tom

the drain area is usually heated on the pressure drop type of dryer but i have never had a problem with no heat on mine.. it just keeps the moisture from freezing on really cold days. you should bve able to find a used unit for $50. tom