Technically you should join the pipes together as you will end up with dead legs in the cooling system, ie areas where the coolant is stagnant and not moving.
If this stagnant coolant is in the rubber pipes then all you risk is a burst pipe, if the stagnant coolant is in the head or block then perhaps local overheating in that area is a risk with bigger consequences.
Real world it probably doesn't make any difference on the throttle body heater, but i think youd wanna be careful doing it on the heater hoses. Alot more stagnant coolant there.
If this stagnant coolant is in the rubber pipes then all you risk is a burst pipe, if the stagnant coolant is in the head or block then perhaps local overheating in that area is a risk with bigger consequences.
Real world it probably doesn't make any difference on the throttle body heater, but i think youd wanna be careful doing it on the heater hoses. Alot more stagnant coolant there.
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