My recent purchase
If you have sufficient pressure to blow a core plug, but no pressure at
the radiator cap, there are perhaps two reasons
One .- excess pressure from a head gasket/block.
Two:- Blockage to or at the radiator.
Check the thermostat and the bottom of the radiator. If both are blocked the
core plugs take the brunt of the pressure.
Hope this helps and happy digging.
David
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