Ideas to prevent fogging in 4440 cab

KYpatriot

Member
Using the heat in the winter fogs my windows so fast I dont hardly use it unless it is very cold. Any idea how to prevent thus or mitigate it?
 
Hum ? Wonder if it has a leaking heater core ? Had that happen in pick up trucks a couple of times.
 
Mike has a good idea, hopefully heater core is OK, also, there's 2 drain lines down the cab posts for the AC drain pan, make sure those are open so there isn't any water puddled under the airflow.

Also, you can run a bit of AC along with the heat to remove humidity, that's how automotive heat/AC systems work, automatically when in "defrost/defog".

Next trick is to use a fan or two to keep air moving past the windows.

<img src = "https://images-na.ssl-images-amazon.com/images/I/41HkoCS50AL._SY355_.jpg">
 
Run the ac switch on a little bit these cabs seem
to have a little moisture buildup in the air ducts and
running the ac will keep the windows from fogging
 
Run the AC like svcummins said. The drains and heater core are good in
my 4430, and if I don't run the AC at the same time it fogs the glass
in no time. AC equipped cars do the same thing when you run the
defrost it cycles the AC compressor to act as an air drier.
 
(quoted from post at 23:56:38 01/18/19) Run the AC like svcummins said. The drains and heater core are good in
my 4430, and if I don't run the AC at the same time it fogs the glass
in no time. AC equipped cars do the same thing when you run the
defrost it cycles the AC compressor to act as an air drier.

Thanks to all I will try the AC running at the same timeand maybe add a fan.
 
Sounds like your have moisture up top.
Make sure drain lines are clear and
heater core isn't leaking. I have never
had to run the AC with the heater.
 

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