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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
A cooling system pressure pump needs to be used to see if it leaks down the pressure over a 30 minute period. If there is an external leak, this will help you find it. If there is no external leak and you do lose pressure then your going to a misfire on startup from coolant getting into the combustion chamber through a warped or crack head, or from a head gasket weak. The coolant is going somewhere we just have to figure out if its being lost internal or external.
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It is written on the coolant cap. I show 18 psi max.
That looks like at some point there was something in the coolant other than just coolant like oil or gas. Glad I could help and thanks for leaving me a rating.
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