I pulled off the rear backing of the seat and there seem to be two vents, one on either side of the cab....i was wondering was are those for and is it ok if i sealed those up because i am going to put sound deadening mat all over the back of that wall

 

they are there to let air out of the cab when you close the door or turn the air on.... I covered mine up and I can feel the pressure change when I turn my air on or off. its a small price to pay tho as those things would flap with my exhast note and got on my last nerve

 

You do NOT want to seal them up. They serve a few purposes related to air-tightness (or lack of)... For example, if there we no vents, then it would be harder to close your doors with the windows up. There'd be no place for the air to escape. Also if you run your a/c on "fresh" (not recirc), that actually introduces new/fresh air into the cab. There has to be an outlet for the air to get out. I'm sure there's more reasons... But no, don't seal them up.

 

anyone one else have an opinion on this?

 

Having the vents closed off can cause a window to shatter on a really hot day when you shut the door with all the windows up.

 

i have a cb radio in the truck so there is a hole open by the driver side kick panel...would that be enough air flow to keep the windows from shattering on a hot day if i did seal up the back (that would suck so bad, and i know it would happen to me when i was in a hurry)

 

I would think so, but I have seen alot of shattered windows in the summer here in Arizona. Most of the time I keep my A/C set to vent, and sometimes also put a window down just a bit. Keeping the A/c on vent maybe enough to allow the pressure to escape.

good luck.

 

The vents keep you from getting asphyxiated as well as letting pressure out of the cab.

 

if you seal them up, drive with the windows up on long trips... ever heard of "Insufficient environmental oxygen" (asphyxiated)

have you ever drove on long trips and got real sleepy all of a sudden, roll the windows down and now you are fine... wonder why.... CO2 build up in cab..

 

CO2 only builds in the cab if you have an exhaust leak. The main purpose for the vents is to let the pressure out when you shut the door.

 

If you cover them up, be careful not to Fart in the truck..... Could be deadly if you are a smoker.....

 

This is especially dangerous on burrito night!

 

An exhaust leak builds up Carbon Monoxide, not Dioxide.
And if you just keep your air on recycle, with no fresh air CO2 will build up enough to set off a CO2 warning in about two hours with a regular cab and two people.
We tried it.
By an hour and a half the air was lousy, and we were both yawning and getting sleepy. Middle of the day, long drive. At just shy of two hours the CO2 alarm went off. That indicates dangerous levels of CO2.

Oddly, the CO2 detectors don't react at all to carbon Monoxide.

If you cover the rear vents you will have to slam your doors to close them. I covered near the vents and the doors became much harder to close.
And with the two vents even partially covered you get much less air from your vents. Noticeable on hot days.


Chris

 

Ooops! I forgot to correct that by removing the 2 from the CO.

 

I covered the back wall entirely with dynomat extreme. I did all but half of the passengers side vent to let the air pressure release a bit easier. This greatly reduced noise from my magnaflow and the road. Now I just have to get the roof and floor done. I've had them closed up for a few months and took a few long trips with no problems.