As I was driving my 2000 Expedition today, I noticed a very light smoke coming from the vents. I checked under the hood and didn't see any visual damage. Also the truck didn't overheat. I can't smell, so I asked my partner what does it smell like and he thought it was antifreeze, although he wasn't sure.
Any thoughts what it may be?
As always,
Thank you,
Brimis

 

If it is anti-freeze coolant the heater core may have sprung a leak in which case it will need to be replaced. One way to confirm this would be to turn on the defrosters and if it fogs the windshield right away , the core is leaking.

 

I'll check now.
Thank you