Why do I feel hot air and smell engine fumes when I open the windows of my 1997 Tahoe?
Mainly because you're about to experience a break-down.
The smell of antifreeze is very strong and distinct, it does not take much of a leak to smell it. The radiator could still be full and have a small leak. I would check for antifreeze dripping onto the exhaust or on the engine block because when it is hot the smell is much more noticeable from the fumes.
A "smell" is added to propane the same as a "smell" is added to natural gas. Some people describe it as being like old cabbage. I can attest that it is not pleasant and unless you have very poor sense of smell you will notice it. Don't ignore it if you do. Propane is heavier than air and will lie in a low area and is very combustible.
Why would a 1998 Ford Contour with 2.5L V6 engine that has no visible signs of a fuel leak smell like gas all the time?
Why you can smell gas fumes from my 2002 Yukon Denali fully loaded after driving and when Iam driving with the windows down or up?
i HAVE AN 2005 YUKON XL, & IT DOES THE SAME THING, BUT ONLY WITH THE WINDOWS DOWN. HAVE HAD IT IN THE SHOP FOR THE LAST 3 WEEKS. 4 DIFFERENT PLACES. NO ONE CAN TELL ME THE CAUSE, THEY ALL SAY THERE IS NOTHING WRONG WITH MY TRUCK!!??? WELL I'VE HAD IT SINCE IT WAS BRAND NEW AND JUST STARTED SMELLING FUMES A FEW WEEKS AGO. MY NEXT CALL IS GM.