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If the heater has a sweet smell it could be that the heater core is leaking engine coolant. When the leak gets worse you will have a wet floor on the passenger side and the windshield will fog up when you turn on the defroster.
Did you ever have a coolant leak?
The "antifreeze smell out the AC vents" would mean only one thing, you have a small leak in the heater core.
Here are a few reasons, low on coolant due to a leak in the cooling system, plugged heater core due to poor cooling system maintanence and temperature blend door or temp blend valve not functioning properly. Also a stuck open thermostat could cause this.
that is the heater core that is leaking which is located behind the radio.
Broken or split hose Radiator leak heater core leak
not any oil in your heater core although the heater core uses coolant coming from and returning to the engine so when damaged or being worked on coolant can leak under the dash and into the floor
heater core has a leak replace heater core
heater core
Leak in heater core
No it wont. The heater core is just a small radiator inside the cabin that when the fan is turned on heats the air. A bad heater core will cause you to have no heat inside or will leak coolant on the carpet.
possible leak in heater core.
Leaking heater core
Your heater core is probably bad.
A coolant leak on a 93 cavalier could be anyplace where coolant flows. Check all hoses, connections, the radiator, and heater core for any possible leak spots.
coolant leak inside car underdash on pass. side
The heater core is located in the same place.If you have coolant coming from the tube,your heater core is bad and needs to be replaced.