do you have a pump to move the coolant?
either way i dont think it would cause to much issue other that your heater wont get as much flow as it used to.
example 1" pipe carries 12 gpm and 3/4" pipe carries 9 gpm.
notice i said example because there are variables that factor in for specific fluid,pressure and bends ,turns, heater connections, heater core itself but at a minimum in a perfect world your heater will not be as efficient as it was.
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