My 2010 Dodge Caliber has been leaking anti-freeze very slowly. I notice it when I start the car up and for the first minute I can actually smell the antifreeze coming through the vents when I have the air on. If I park the car and go in to the grocery store for a few minutes and start it up again the smell doesn’t re-occur. I imagine I have a leak somewhere that is dripping onto the engine and when the car starts up from cold it burns it which is sending that smell through my vents.
I was told a while ago it could be the heater core, however I would assume that if it was the heater core I would have had a fog up on my window or a constant smell, not one that dissipates after a minute.
I had this problem last year except I was losing a lot of antifreeze (about a whole reservoir in 3 - 4 days. The problem was found to be a broken clamp on one of the hoses. This time however I cannot find any broken clamps or a source of the leak for that matter. I did notice that when I shut the car off the one time, and checked under the hood of the car I seen one air bubble spring up from the reservoir tank. I cannot see any signs of a leak from under the hood. However under the car I can see it is dripping from the frame, but not where it is coming from.