coolant loss

[stockers 1]

hi all, got a coolant loss.

40min journey on the motorway and lost the coolant reservoir of coolant, not overheating, no warning lights.

ran the engine while stationary and couldn't see a drip or leak anywhere !dodge

i've had the head gasket replaced recently but had no loss after that, then last week i had the oil water heat exchanger changed and i've had to top up the coolant a couple of times since that was replaced, might they not have sealed something or should have replaced an 'o' ring and didn't?

i'm not sure what is supposed to be replaced along with the exchanger.

any thoughts?

[stockers 1]

sorted, pin size hole in coolant pipe

[57ORM 0]

I ain't no expert but this is what happened to me on a corrado

Like you left the car running looking for the leak no sign. Started to rev the engine and the leak was not visable untill it hit 4000 rpm and water started to spray out of the coolant hose from the heater matrix to the top of the head.