Hey guys, the answer to this is probably obvious but I want to double check before I begin the work. On my 2001 XJ Sport, when I turn on the heat or defrost I get the smell of antifreeeze immediately until its almost overwhelming. I assume the heater core sprung a leak and is leaking into the heater box or vents?? I have looked up under the dash on both sides and checked under the hood but I do not see a leak. I am assuming it is just leaking into the heater box. Am I right or could it be something else? I need to fix this ASAP as the fumes make me sick just driving 5 minutes to work and its getting pretty cold to have the windows down. Thanks..