I smell antifreeze when I run my heat and/or defroster…but BOTH still WORK fine! There is no leaking of coolant into the cab of the car or through defroster vents. It’s a 1995 Isuzu Rodeo with 155K miles on it

Smelling antifreeze when I run heat

missileman January 8, 2011, 8:36pm 4

I too agree that the heater core is probably leaking. Don’t breathe the fumes very long as they are very toxic especially to small children. I would avoid running the heat for this reason.