the pump head is in contact with the motor frame only at its mounting flange, difficult to understand how the heat could be transferred to the coolant
??
in any case, the pump should not be hot to the touch - a bit warm at the most, but certainly not 'hot'
- stick a thermometer on it ? (what does 'hot' mean ?)
a pinched line ?
agree something is wrong, not convinced the pump is the cause at all
perhaps a radiator would help ?
not gonna dissipate much heat from a tank !
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