My 04 C230 is req, antifreeze to be added every 2 days, but i dont see any leaks on 2004 Mercedes-Benz C230

I add antifreeze to the resivour every 2 days maybe about 16oz I dont see any leaks but when i drive i do smell it occassionally through the vents. This just started a few days ago.

Asked by for the 2004 Mercedes-Benz C230
you have a leak somewhere, check your heater core if you smell coolant through the vent, find a local good shop to pressure tested.
Thanks I will do that. Its just strange i dont see anything underneath
1 more answer
The heater core is inside the vehicle and has a drain tube that runs outside the firewall. If it is leaking it may only be while driving.