I seriously doubt your core would leak without pressure, otherwise you would have a blown engine and a gallon of coolant under the gas pedal.

Yes, there is a screw holding the pipes to the core and it is not fun to reach. Nor is it fun lying on the floor of the car for an hour. But a job well done at home beats paying a mechanic everytime.

To others who read this, use a plastic bag to catch any coolant and newspapers make the best sponge.

Klaus
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Always willing to listen, just not able to take direction.