The heat exchanger is clogged
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Pierced with a drill, but it’s not connected
A high-pressure water gun cannot generate 200 kilograms of force
Previously, the problem was clogs in the shell side; a clog in the tube side like yours is relatively easier to deal with. One can use a drill to gradually clear each section, and then use a high-pressure water gun to wash away any remaining residues.
Try heating it up, but remember: it must never be cleaned with water when it’s hot, otherwise it will be damaged. You should know about the principle of thermal expansion and contraction
For cleaning equipment, there are drills that use water for rinsing; it’s necessary to work on each one individually