If a car is missing a heater coil, would it make the car use more antifreeze?

A car shouldn't use (consume) any anti-freeze at all. The coolant (anti-freeze) circulates in a closed system.

It sounds like you may have a leak, if you need to add anti-freeze. Also, please make sure it is mixed with water per directions. Typically this is 50/50, but can be different on some types of anti freeze.

if the heater coil is missing that means someone must have bypassed it by either connecting the heater hoses together or blocking them check for leaks only a shade tree mechanic would do this it could be that it would use more antifreeze if no leaks it would actually take less to fill the system

Hi well it uses less antifreeze, less space, the only time uses more antifreeze is when the engine block or head gasket cracked or torn inside, another place radiator and freeze plugs leaking, also it could be mixing with the oil due to head gasket leaking, the time you will notice in the cold morning steaming really good, more than usual.

I hope this answer your question.

Pedro R

no you can run without heater coil .however you would have to tie the two pipes leading to the heater coil together and make sure they are sealed t5eight .their wouldn't be a significant difference in the amount of antifreeze need

Heater Core?? No, a correctly running car "uses" zero coolant. You can bypass the core and typically go problem free.

No. It would require less antifreeze to fill the system.

No. It must be leaking somewhere either internal or external to the engine.

dang!Paul took my answer.lol