air dryer purging every 5 minutes

So after pulling my hair out doing the same thing, I found the governer itself leaking at the compressor, new gov/gasket with a little sealant and went from 18 minutes between purges to an hour and 2 minutes, I know I’ve got one small one at my glad hands on the trailer but that’s a slight project right now

 

Dryer is most likely about to take a ####.
Coolant issue will be a pita, pressure test it.
If dealer part it on back order get part number and order aftermarket online.
Good luck

 

I agree, pressure test ASAP. Don’t keep guessing. Could be the beginning of an eventual blown head gasket. If it’s building excess pressure, could be showing up in weak points. Waterpump weep hole for instance. What’s next? Weak spot on the oil cooler? Weak hose? Chasing Demons. Each time thinking it’s fixed. Same Shop then says Oh! now the head gaskets bad too!! Pressure Test system, look for leaks, start it up, see if it builds excessive pressure. At least rule out major issues first. Hope it passes the test. Other things are minor issues.

 

Why.?