Is it possible to have a pressurized air leak from a coolant line?

With it being back of the motor area.. kinda makes me think of coolant lines going to cab/bunk heater.

Still, shouldn't have air bubbles coming from a coolant line.

Are you sure its coolant and not DEF?

 

DEF lmao that goes to exhaust, not engine.

 

coolant leaks coolant.

Air leaks air. If you got bubbles after spraying Mr Soapy water on a questionable line it's air.

If you looked at a leaking coolant line its either coolant coming out or steam after the level of it has leaked out enough to be below the leak. You will also see evidence of coolant all over down below the leak area.

Coolant pressurizes itself against the radiator cap up to a certain amount. It wants out. Cap keeps it in. Nothing air about it.

I can go on but I think we understand air leaks here.

 

If it's a DD15 and the air compressor is leaking you can get air pressure in the coolant. Would explain air and coolant loss.

 

Had a FLD? with a air controled water valve in the sleeper. It was putting pressure in the coolant and swelling all the hoses.

 

I had a cummins that had a bad aircompressor head gasket. It would pressurize the cooling system. So yes air can pressurize cooling system for those who said it can't. Im not saying thats your problem but its something to think about

 

If I remember port side is Drivers side, Starboard would be Passengers side. And a nautical mile is? And a knot equals? Lol. Anyway maybe it’s the coolant line to compressor. 1 in /1 out.

 

That’s often overlooked, My 92 WS had one on the firewall also for cab. Bunk valve went bad, turn key off, with radiator cap off, it shot coolant 15’ into the air, like a volcano. Lol, Luckily figured it out, before I let them pull the head. Everyone said I needed an OH. My 99 Freightliner had one on bunk only. Current 2000 doesn’t, Thank God. It was a bad design, cause of many unnecessary repairs.