air dryer purging every 5 minutes

i hope you find a good lonely spot for your 10

 

Ain't that the truth! I pulled in to one of my favorite hidey-holes the other day which has room for about 3 trucks. Dead end in the back of an industrial park. There was a clean looking Cascadia sitting there idling. As soon as I got shut down and dinner on I started hearing the sound off every freakin' minute.

 

I've also got a 2017 t680 with an isx15, used Melton truck. It's always used a little coolant and sometimes when I shut it down for the night the next morning the coolant levels look pretty low until I turn the truck on for a few minutes.
If you have an APU you could be losing coolant there. Especially check the hoses as they come out of it and have a near 90 degree turn, I found those leaking a little.
As far as the the air dryer cartridge goes if you've never changed it then it's probably going to be a mother ####er to get off. Whatever you do, do not try and do the screwdriver trick on it because the desiccant will go through your air system if you do. If you can get the cartridge off and changed you'll probably want to go ahead and change the purge valve. They are about 100 bucks and you'll need to take a tension ring off that can also be a pain in the ###, use safety glasses.

 

I thought you said you were losing coolant but didn't see any leaks? So, was it actually the water pump leaking but you couldn't see the leak?

 

Well we did ask questions along the way. To try n help narrow down some stuff. Some of us are trying to help you figure it out and we only have four mins to read thru every thing

 

Paccar air fitting all leak. They suck.

Go piece by piece and replace the plastic crap with brass fittings.

I paid a shop 2 hours to find leaks, they found exactly 1. Truck still loses all the air in 30 min, without any hiss. I think the cab air ride must be leaking, but this setup for air is ####.