Does anyone else have a bad cold draft on the passenger side floor during the winter? What is causing this?

 

what year is the truck? and is the draft when the heat or defrost is on?

 

Mine and my old one do the same thing. Mine is when youhave both theheat and defrost on. I tried to have the wife drive it so I could look at it while going down the road but didnt come up with anything. I would be very interested to fix this, I have to have the heat on soo high to keep the passenger warm that I sweat right out of the cab!

 

Nobody? This is a pretty useless forum!

 

I have no idea about the GM trucks but my mothers 4 runner had a similar problem. It happened all the time dispite the heater being on. It was a grommet on the firewall near the duct that had fallen out.

I would mess with all the settings on the ac/heater and see if it gets better or worse. What happens when you shut it off completely? Maybe the blend door the goes between pulling air in vs. recirculating the cabin air?

 

My truck is a '99 Z-71.

It seems like it happens when the heat or defrost are on. I never hear any complaints from my wife except in the winter.