Front defroster problems

Just because there is not any anti-freeze dripping on the floor yet does not mean the heater core is not leaking. It is probably the heater core and it has a small leak and the fluid that comes out is already a vapor if so you do need to have the heater core replaced.

But it sounds more like you have a mode door actuator that is out. #2

Here is a guide that will help you see what you are i for when doing the job. Even though this is for the blend door, the process is the same for the mode door.

https://www.2carpros.com/articles/replace-blend-door-motor

Here is the location for your car (below) I gave you all of the actuator locations for future reference.

Please let us know what happens.

Cheers, Ken

Check to see if there is power to the defroster. It should have 12v. If it doesn't, you need to trace the wiring from the defroster to see where the power is lost.

The antifreeze has to warm up and circulate through the heater core in order for you to have heat, it takes a vehicle a while to heat it up on a cold morning.

Make sure the coolant level is full. If it is full, you may need to flush the heater core.

You may have an actuator not working causeing this. There are two n the heater unit that control air flow. Check to see if they are gettting power.

To find out you have to open it up and check all the doors operation could be a vacuum or an actuator problem

It sounds like what you smelled was coolant. You may have a leak somewhere resulting in the smell. Did your windshield get fogged up when you turn the defrost on? Do you have liquid on the floor on the passenger side? If the leak is inside the engine compartment, it's possible the coolant leaked on a hot part of the engine which resulted in the strong odor you smelled. Have the car inspected for leaks. A coolant leak will result in lack of heat inside the car and eventually result in your engine overheating.

Could be your ac compressor clutch is grinding. Can you look down by the compressor and see if you see metal shavings on the pully

Sometimes they do offer parts to replace the clutch. But you might have to replace the compressor. I think I would take it to a shop and have them repair it. Either way both repairs require special tools to finish the job. Let me know what you find out

But is the system full. Sounds like there is a leak somewhere causing a air pocket in the cooling system