Fogging Windows

[rhino1]

I have a chevy silverado, and the windows are always fogging up really bad in the inside.It takes a long time to defrost them. Just wandering if it that happens to anyone else.

[PGDriver]

I have a chevy silverado, and the windows are always fogging up really bad in the inside.It takes a long time to defrost them. Just wandering if it that happens to anyone else.

 

Yes it has happened to me once (I have only had my new truck 3 weeks).

I checked behind the glove box and the fresh air intake flap was working

as it should and it hasn't happened again, so I think the flap must have

become stuck closed that 1 time.

[bbwb]

One thing to do is to keep the fan speed up to dissipate the moisture. Also, if you have wet floor boards/mat, and are using the heater function, the heat will vaporize the water and allow it to condensate on the cooler/cold glass.

 

bbwb

[gstarko]

One thing to do is to keep the fan speed up to dissipate the moisture. Also, if you have wet floor boards/mat, and are using the heater function, the heat will vaporize the water and allow it to condensate on the cooler/cold glass.

 

bbwb

 

what year is your truck? there is PIT5056A for 2010-2011 silverado and sierra's With RPO C67 or CJ3

Manual Hvac System

 

to reprogram the hvac module for this concern, have only seen one truck with this concern to date.

[PGDriver]

Seems window fogging is all over the forum....

http://www.gm-trucks.com/forums/index.php?...&hl=fogging

Sure hope GM comes up with something soon.

[IainDaniel]

I picked up some Rain-x glass defogger. seems to be doing the trick.

[jdubya]

try turning the AC on and the temp dial to hot. This works for me to clear the windows quickly...

[bradpell8]

If your feet are wet and you have it on bi level (floor and defrost) it will fog up till the moisture is gone. Try putting it on vent and floor and turn your outer most vents to the window till the floor is dry.

[PGDriver]

Its not an internal moisture problem.

Just got back from the dealership, I was told that mine was the second one they fixed since GM came out with a software recalibration of the HVAC. They said the other person has had no trouble since the fix, so I'm hoping that is the end of my cab fogging up.

 

When I went in I handed them this and they new all about it.

 

 

Subject: Excessive Cabin Moisture/Reduced Window Clearing

Models:

2010-2011 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2010-2011 GMC Sierra, Yukon, Yukon XL

With RPO C67 or CJ3

Manual Hvac System

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

CONDITION/CONCERN:

In rare cases, some customers may comment of excessive cabin moisture or difficulty keeping the

windows clear in low ambient temperatures.

RECOMMENDATION/INSTRUCTIONS:

If normal diagnostics do not lead to a correction, inspect the HVAC recirculation door by lowering the

glove box. The door should be in the "Fresh Air" position, which closes off the recirculation opening

behind the glove box when the HVAC controls are in the floor to defrost position. If not, then follow

the procedure below:

1. Turn the vehicle ON.

2. Set the HVAC controls to a Vent/Panel position.

3. Press the Recirculation button on the control head.

4. Move the HVAC controls back to a Floor / Defrost position

5. Verify the Recirculation door has moved to the Fresh Air position by visual inspection.

6. Return the vehicle back to the owner and instruction them NOT to use the recirculation button and

that Engineering is working on a software update.

7. If the vehicle returns with this concern and the recirculation door is again in the recirculation

position then Contact GM Technical Assistance.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition

exhibited is resolved without completing every step, the remaining steps do not need to be

performed.

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