Coolant spraying... What is going on?

[snailexpress]

(10-25-2017 )Waterloo Wrote:  I have not tried with the cap off. I start the motor cold, cap on, she sprays, I shut her down, and immediately restart, no issue on the restart with cap on or off. The system itself does not seem to be building any pressure other than what would normally expect, a bit of water cavataion in the bottle. I put my hand over the coolant jug top for a few minutes, I felt no pressure on the palm of my bare hand at all.

You didn't read Cummins coolant fill instruction.
What it says -
Close the bleed valve on the upper radiator pipe, or install the
pipe plug. Do *not* install the coolant pressure cap at this time
* Start the engine and allow it to reach an operating temperature of
85°C [185°F], or until the thermostats opens.
* Shut the engine off and check the coolant level. Adjust the coolant
level, as necessary.

If any drained coolant remains after filling, there is an air pocket in
the system which *must* be purged. Allow the engine to reach operating
temperature and top-off the system with coolant.


NOTE: Proper fill and deareration of the system is critical to
EGR cooler life.