For the last week I have been smelling a burning smell with no visible smoke. It only occurs after the engine is warmed up and I have the heater pulling in air from the outside.
I can't tell if its oil or something else but it coincidentally started to get noticeable after an oil change.
I popped open the hood and noticed fluid at the seam of the hose with the "F" on it (Pic below). The left side of the engine also looked damp.
To me it looks like it attaches to a compressor (AC) but not sure. There was a small spot on the driveway when I checked the next morning.
Its a 2004 WRX. Any help would be appreciated.