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-   -   t600/t800 defrost (https://www.classadrivers.com/forum/truck-maintenance/31265-t600-t800-defrost.html)

rank 12-13-2007 02:22 PM

t600/t800 defrost
 
The heater/AC/defrost fan doesn't seem to blow as much air as it should in my '95 T600 and my '98 T800. The temp is fine, it just needs more air. I need to have the def on full in order to keep the fog and ice off, meanwhile the side windows fog up and my feet freeze.

Is this a common thing?

headborg 12-13-2007 02:27 PM

can't speak for about the t600, but the t-800---you can't get the side windows to defrost( at least I never could )--yep need electric socks...or keep switching from def to floor vent.

rank 12-13-2007 02:49 PM

oh great. :roll:

bob h 12-13-2007 11:50 PM

Re: t600/t800 defrost
 

Originally Posted by rank
The heater/AC/defrost fan doesn't seem to blow as much air as it should in my '95 T600 and my '98 T800. The temp is fine, it just needs more air. I need to have the def on full in order to keep the fog and ice off, meanwhile the side windows fog up and my feet freeze.

Is this a common thing?


If the airflow is truly too low, it is most likely caused by the cabin air filter for the HVAC system.

allan5oh 12-14-2007 05:55 AM

Stop breathing.

Maniac 12-14-2007 08:22 AM


Is this a common thing?



Yes, in KW's anyway, driver side fogs up bad on my all the W9's I have had, there is no cabin filter that I know of, only thing you can check is that all the vent hoses are attached and not kinked behind the dash.

I have the passenger side floor heat vent blocked off, so I can get more heat on my side, I keep the center vents on the dash closed in the winter, and the side ones aimed at the side windows.

headborg 12-14-2007 08:37 AM


Originally Posted by Maniac

Is this a common thing?



Yes, in KW's anyway, driver side fogs up bad on my all the W9's I have had, there is no cabin filter that I know of, only thing you can check is that all the vent hoses are attached and not kinked behind the dash.

I have the passenger side floor heat vent blocked off, so I can get more heat on my side, I keep the center vents on the dash closed in the winter, and the side ones aimed at the side windows.

then buy one of those clip-on tornado fans and clip to the passanger hand hold- aim at your passanger window and pug in the cig lighter and suck some of that defrost and direct it at the window.

bob h 12-14-2007 12:21 PM


Originally Posted by Maniac

Is this a common thing?



Yes, in KW's anyway, driver side fogs up bad on my all the W9's I have had, there is no cabin filter that I know of,


I've had lots of customers that "didn't know they had one"... it's used to filter incoming air before it clogs your a/c evaporator.

COLT 12-14-2007 02:01 PM

Use fresh air, not recirculate, and don't drag snow into your truck from your boots...

Use a "winter front" when it's cold.

headborg 12-14-2007 02:34 PM


Originally Posted by bob h

Originally Posted by Maniac

Is this a common thing?



Yes, in KW's anyway, driver side fogs up bad on my all the W9's I have had, there is no cabin filter that I know of,


I've had lots of customers that "didn't know they had one"... it's used to filter incoming air before it clogs your a/c evaporator.

I couldn't say for sure-but I bet Bob's right--every other truck I've driven had one--usually located just behind the AirFilter in a pull out compartment--there's a place under the bunk for one there too. It's just been too many years since I've been in a KW to remember ...where it's at.

Come on Bob! Don't keep us in suspense......where's it located? So the poor guy can at least pull that dirty clogged one--get some heat going before he freezes his toes and other parts off.


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