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RE block test.
Starting the engine cold with the cap removed. You should see the coolant slowly expand and over flow, that's normal. That over flow normally goes into the recovery bottle and the level rises. When the engine cools off the level drops.
Totally normal.
Abnormal is not being able to bleed the system until there are no bubbles and-or bubbles in the recovery bottle after the system has been completely bled. Those bubbles indicate a failure in the head gasket and those bubbles are from the combustion chamber.
regards
mech
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