It is necessary to drain the engine coolant before replacing
A) the blower motor.
B) the heater core.
C) the vacuum diaphragm.
D) all of the above.

Question

Quizplus · Accepted Answer

The heater core is a part of the engine coolant system, therefore it is necessary to drain the engine coolant before replacing it. The blower motor and vacuum diaphragm are not connected to the engine coolant system and therefore do not require draining of the coolant.

It Is Necessary to Drain the Engine Coolant Before Replacing