I smell anti-freeze is this the heater core

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your LS. The symptoms you're describing—fogged windows, the inability to defrost, and the smell of antifreeze—strongly suggest an issue with the heater core. When a heater core develops a leak, coolant can escape into the cabin, causing a sweet smell and moisture that fogs up the windows. To confirm, check if the carpet is damp or if you notice a drop in the coolant level in the reservoir. If this is the case, the heater core likely needs to be replaced. Running the car with a leaking heater core can reduce the coolant level, leading to overheating and engine damage, so it's best to address this soon. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!