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Old Jan 5, 2019 | 06:49 PM
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Windows frosted

03 f350. Just wondering if anyone could tell me why all of my windows are frosting over on the inside? I haven't driven or started the truck on a couple of weeks. Tonight it's about 45 outside so no frost but the windows are all frosted over inside.

 
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Old Jan 5, 2019 | 06:59 PM
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That's because you obviously have water in the cab causing moisture buildup. The windshield is a prime suspect as they are known to leak.
 
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Old Jan 5, 2019 | 08:18 PM
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Originally Posted by ford390gashog
That's because you obviously have water in the cab causing moisture buildup. The windshield is a prime suspect as they are known to leak.
It was raining last week quite a bit. I haven't noticed any water in the cab but I guess I'll take a look under the dash tomorrow and see what I can see. Thanks for the info.
 
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Old Jan 6, 2019 | 07:47 AM
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I'd say definitely excess humidity in your cab either from wet boots or a leak. If you cant find the source right away, think about putting a container of DampRid or a small bucket of calcium chloride (ice melt) in the cab to absorb some of that moisture. It will help temporarily.
 
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Old Jan 6, 2019 | 09:00 AM
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Originally Posted by Juneaudave
I'd say definitely excess humidity in your cab either from wet boots or a leak. If you cant find the source right away, think about putting a container of DampRid or a small bucket of calcium chloride (ice melt) in the cab to absorb some of that moisture. It will help temporarily.
Thanks for the info. I noticed some paint flake on one of the cab marker lights , I'm going out in a few minutes to see if I have a rust hole around the lights.
 
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Old Jan 7, 2019 | 06:09 AM
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The carpet may ‘feel’ dry to the touch but the underlying insulation may still be damp. By the look of your windows I would think there is something fairly wet someplace. Was the back center window left open? Do you have a back seat? If so might try taking it out to see what the carpet and underlying insulation is like there.
 
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Old Jan 8, 2019 | 12:11 PM
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Originally Posted by Chuck-B
The carpet may ‘feel’ dry to the touch but the underlying insulation may still be damp. By the look of your windows I would think there is something fairly wet someplace. Was the back center window left open? Do you have a back seat? If so might try taking it out to see what the carpet and underlying insulation is like there.
It's a single cab, no back seat., It started pouring down rain when I was going to check out the water. I couldn't find anything wet inside, I will have to pull some molding and pull the carpet back to see if it's wet underneath. There wasn't any water coming in from the rear slider that I could see, also I don't see any water stains on the headliner. Today is sunny out, I'll see what I can see when I get off work today. One other thought is, I have rusted cab corners and rockers, could this let enough moisture into the cab to cause this?
Thanks.

 
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Old Jan 8, 2019 | 02:01 PM
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Rusted surfaces alone won't allow water to enter, unless they're weak or have pinholes.

If you get some nice sunny days with low humidity, put a box fan in the cab on one side with the doors open and leave it all day at full blast. Might help pull some moisture out.
 
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Old Jan 8, 2019 | 04:24 PM
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I have taken a look under the dash and water is there all the way into the floor insulation. I believe it's coming in from around the cab light, it's pretty rusted around the front if it.
 
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Old Jan 8, 2019 | 05:38 PM
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That is ugly. Were those factory or added later?
 
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Old Jan 8, 2019 | 05:41 PM
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It's an 03 I bought it 3 years ago so I dont know if they're stick or not.
 
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Old Jan 8, 2019 | 06:00 PM
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I wouldn’t discount some water getting in there but sounds more like a windshield leak I wouldn’t be a bit surprised if you were getting water from both places. I had one truck with cab lights, never again. I didn’t have any leaking yet but there were starting to rust along with everywhere else good riddance to that rot box luckily I dump it before it got to bad.
 
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Old Jan 8, 2019 | 08:16 PM
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Originally Posted by Mike189677
I wouldn’t discount some water getting in there but sounds more like a windshield leak I wouldn’t be a bit surprised if you were getting water from both places. I had one truck with cab lights, never again. I didn’t have any leaking yet but there were starting to rust along with everywhere else good riddance to that rot box luckily I dump it before it got to bad.
when the weather gets warmer I'll check it with a hose. In the meantime, I can use some silicone around the lights and windshield. Springtime, I'll pull the cab lights sand down the roof line and run a TIG weld to seal up any holes. Probably won't put the lights back on.
 
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Old Jan 8, 2019 | 08:23 PM
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Even if you don't have a leak, you can get moisture in your cab through snow on your boots and even just from a big change in the weather. The OP says he hasn't driven it in a while, so that may be it. Any time it's gets truly cold (like -20 or worse) you should do your best to get fresh cold dry air into the truck by leaving a window cracked open as much as you can.
 
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