why does my rig fog up inside when i blow the heat at high ? (1 Viewer)

Joined
Nov 27, 2009
Messages
163
Location
Santa Cruz, CA
my 91 LC fogs up inside whenever its cold outside and i put the heat on high, all the windows fog up even the rear, ??? all my windows are closed. some help please
 

PabloVTA

beside La Caja China
SILVER Star
Joined
Sep 30, 2005
Messages
2,480
Location
Ventura Ca. USA
 
 
 
only use recirc until it gets warm, if it gets too warm, you build up humidity.

Are your carpets wet? like from snow melt or plugged drains?

you can do what my dad always tried...."Quit breathing! yer foggin it up!"
 
Joined
Oct 8, 2010
Messages
169
Location
Albuquerque
Anti-fog

If those things don't work,

I had the same problem with my '91. I found a bottle of "Anti-Fog" by 3M at auto zone for $4. just clean your windows on the inside really good and apply this. Works a lot like Rain-X for the inside and it works great.
 
Joined
Jan 20, 2009
Messages
392
Location
Rigby, Idaho
 
 
In Flagstaff Arizona you probably don't have a lot of humidity in the air. My guess would be your heater is in constant recirculation mode--pulling "wet" air from the cabin and recirculating it. If it were pulling dry, Flagstaff air from the outside, you should probably have clean windows whether the heat was on high or not.
 
Joined
Sep 15, 2006
Messages
2,002
Location
Vidor, TX
Running the A/C should be enough to keep the truck fog-free. We have really high humidity here and I have the same issue if I don't run the A/C and I never run it with fresh air, always recirc.
 

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