The TCV controls the flow of anti-freeze coolant, not the raw water. The raw water path is pretty simple. Since you have already confirmed that the raw water path is clear to the HX inlet, the next step is to reconnect it and disconnect the hose from the HX raw water outlet. If there's no flow out, the HX is clogged.
I'd say this is likely. One of the two picture links you posted shows a bit of corrosion around the HX top plate, and the zinc and bottom plate, Indicating that they've been weeping for some time without maintenance.
If the HX turns out not be the problem, the next thing downstream is the water injection point. These can become clogged with salt crystals, corrosion, and other crud.
Nice job Edward.
Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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