You could always pressure test the coolant system to 10psi and see what happens. If you have leaks you will find out, and if you have a bad head gasket well... you might be pulling the glow plugs to get coolant out of the cylinders
Also, does one of your heater hoses run to the head on the passenger side? Could it be the hose happens to leak when it got warm? The one above / between cylinders 1 and 3.
Also, does one of your heater hoses run to the head on the passenger side? Could it be the hose happens to leak when it got warm? The one above / between cylinders 1 and 3.
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