Windows fogging up

it's the same thing i was saying........humidity in the air.....

 

I was assigned to a Penske tractor that had rolled breaking the windshield. It was fine during the summer, but on the first frosty day I used the defrosters and the entire cab filled with smog. Nobody would believe the seriousness of the problem. There were days when I had to stop on an exit ramp and operate the heater and defroster for 15 minutes with the side windows open. This usually happened after a night of rain when the truck was parked. Mechanics kept trying to seal the windshield. They finally took an air nozzel to the rubber tube that drains the fresh air intake box below the heater/air conditioner. That tube is flat on the bottom end to allow drainage but not intake. I think broken glass entered the defroster outlets.

 

might be the 1st sign that you have a bad heater core, smell antifreeze too?

 

You need fresh air in the cab. If you are on recirculate with the heater on the moisture in the air is not being taken out. Just turn on the AC and let it run with the temp all the way up and it will heat just as good as the heater or turn on the fresh air selector.

Also if you are a new L/P or O/O you should at least once a month or twice during the winter turn on the AC for a few minutes to circulate the oil in the system to keep your seals from drying out. Company drivers do this also so none of you are setting in the shop waiting for them to find the leaky seal, replacing it or waiting on it to get to the shop and then recharging the system!

 

that was a good idea, running the a/c in the winter, to prevent the seals from drying out....

however, that's not the case nowadays.....because the a/c DOES come on when we use the defrost and sometimes the heat settings. it's all been incorporated into the "fresh air system" we all have in our cars, trucks, SUV's, and even big rigs.

but yep, you were right, the seals would dry up, and oil from the compressor would run out, ruining the compressors (a/c compressors).

 

The thing is younger drivers will use the "defroster" and as soon as the windshield is done turn it off wearing the switch out! LOL

I did forget one simple trick.....crack a vent, or window and allow the fresh air in this way! It also creates an air current or flow inside the cab also!

Also with the APUs I've used unless they added a fresh air duct then leave a window cracked to allow a little air in as sleeping or sitting in the cab all day with the windows rolled up with an APU, moisture builds up and one of the weirdest places is UNDER or actually over the head liner of the cab! Then when the moisture starts to drip off the ceiling or roof of the cab onto the headliner and then runs down to a crack or hole to drip out, it will as Murphy's Law will dictate, drip onto your head or next to the privates and you roll over onto the "wet spot" waking up wondering where she went and what did you do and if you had fun, or if it's time to get the adult diapers

Fresh air is the best answer to getting rid of the moisture.

 

i always crack the passanger window about an inch or two, and i'll put the heat on the defrost/floor setting but not full blast, usually on 1 or 2 just to keep the air circulating. never have a problem. i also drive a freightliner too so give that a try.

 

Check to be sure your heater core isn't leaking...

 

if i am doing lots of cooking in the truck --i get the running water problem--it usually waits until i am sitting in bunk doing logbook then pours onto the table
not sure--i always put on the fresh air--have windows cracked--cause i hate heat--heter on defrost/floor and i still cant keep the freezing crap off of the window--