air dryer purging every 5 minutes

Bad air compressor head,purge your air tanks and check for antifreeze or take the air dryer cartridge off and check there

 

If you are losing coolant and you do not have any visual leaks I would suspect the EGR cooler as the culprit.

 

When you lose coolant, and you pop the top the next morning to refill it. Is there air escaping from the resivour or the radiator cap?

Have you looked in between your fuel tank and tractor to see if the bunk heator core is leaking?

Is the anti freeze starting to Change color?

Can you smell anti freeze randomly?

Are the braided lines coming off the air comperssor soiled in oil?
Do you have a side cap on you resoir tank if so is it all the way tight?

 

Hmmmm looking for simple fix the air dryer only purges when the governor cycles. Simple explanation is there is an air leak oh and filter changes will not change the rate of air loss.

 

Every five minutes? Sounds normal. Every minute, not normal.

Keep in mind, though, idolatry is bad.
Idling your truck is not as bad.

 

Did you watch the air gauge to see the air leak. Set the trailer brakes and see if air loss slows down. Air dryer cycles when the governor shuts off (redirects air flow)you got a slow air leak.
Don’t throw money at a new dryer it won’t fix anything

 

Mine did that a few weeks back. Only while idling. I suspected the governor. Wasn’t cold enough to be ice forming in the spitter valve. It did it a couple times, for a while each time, before quitting. Hasn’t since.