This is potentially a carbon monoxide problem. There may be a leak from
the exhaust system that is bleeding through the air conditioner.

Take the vehicle (with the windows open and a/c off) to a dealer or
maybe your local fire station. They can check the air quality fairly
quickly and it should be free.

Then you need to find the problem. A diagram of which air vents open
with the a/c may help identify the source of a leak. Check exhaust
manifolds and pipes.

You will NOT smell Carbon monoxide BUT if it is an exhaust leak you
should smell the other combustion products.

Hairy wrote:
> "Daniel J. Stern" > wrote in message
> .umich.edu...
> > On Thu, 16 Jun 2005, tailpipe wrote:
> >
> > > i have a 91 chevy cal 2.2 litter how come the other day wen it was realy
> > > hot i truned on my A/C AND IT FELT LIKE I WAS GOING TO PASS OUT I DROVE
> > > MY WIFEY CAR THE SAME DAY AND I FELT FINE THE NEXT DAY I DROVE MY CAR
> > > AND WEN I USED MY A/C ONCE AGAIN I FELT LIKE I WAS GOING TO PASS OUT I
> > > DONT SMELL ANY THING THERES NO LEAKS IN TAILPIPE R HEAD GASTETE R
> > > MANTFOLD PLZ HELP
> >
> > Wow. I have no idea. I sure hope you find and fix the problem in a hurry
> > -- it's making you look like an incoherent, illiterate, snivelling moron.
> >
> > DS
>
> I think maybe "Tailpipe" has been huffing his namesake.:-)
> H