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Garage high humidity floor wet vehicle inside. #5218946 09/21/19 03:34 PM
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littleant Offline OP
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Days when humidity is high (summer or winter) my garage floor will be wet and my 2010 Mountaineer will have beads of water in the body but not always depends how high the humidity is.

My concern are is moisture getting inside the running gear -frame-door and fender panels.

Always garaged never driven in the winter. Just did front and rear differential fluid change and all looked good not milky. I see no water droplets in the oil dip stick. Your opinion would be appreciated.


I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0
Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5218950 09/21/19 03:39 PM
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Ventilation is a good place to start.


2015 F150 2.7
2018 F350 6.2
Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5218958 09/21/19 03:46 PM
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I run a dehumidifier in my extra garage through the summer months. I don't open the doors very often and it stays very comfortable throughout the summer. I am insulated very well also.

Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5218979 09/21/19 04:08 PM
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littleant Offline OP
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Keeping garage door open or closed makes no difference. Open the 2 windows no change. Using a box can does help but takes a long time to dry out.I

Using the box fan before it gets wet helps but it will eventually get wet. It's a one car garage.


I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0
Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219002 09/21/19 04:27 PM
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Fitter30 Offline
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Slab gets wet because it's cooler than the dew point. Garage must be very well insulated to keep slab cooler than dew point.

Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219003 09/21/19 04:27 PM
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wings&wheels Offline
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Hi dehumidifier and a condensate pump


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Re: Garage high humidity floor wet vehicle inside. [Re: Fitter30] #5219032 09/21/19 05:03 PM
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Originally Posted by Fitter30
Slab gets wet because it's cooler than the dew point. Garage must be very well insulated to keep slab cooler than dew point.


It's the way my house is, too. Just sucks. Cold comes out of the ground.

Garage is uninsulated and has semi-open soffits, but the cold concrete trumps all of that. I could run the dehumidifier 24/7 but the electric bill would be worse than the rust on my tools and vehicles.

Inside your axles is probably safe-- I'd worry about the floor pans and brake lines.

In winter, if I were you, I'd consider parking outside during the freeze/thaw cycles with high humidity. Only inside for snow prep and real cold snaps (under 10'F). There's more of a breeze under the car outside vs in a clammy dank garage. And salt is worse at the freezing point vs dry crystals at 10'F.

Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219036 09/21/19 05:06 PM
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I also have been running a dehumidifier when it is really humid for over 20 years in my garage. I just keep it close up, things don't rust, and it almost feels like it's air conditioned when it is hot, and muggy out. I also keep frozen cars covered in snow and ice outside in the winter to keep the moisture under control. I do not ever get any rust on all of the bare steel I have laying around, or my precious tools, and cars.

Last edited by Traction; 09/21/19 05:10 PM.

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Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219112 09/21/19 07:12 PM
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littleant Offline OP
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Some good advice. Winter is worse then summer believe it or not. I think I will put it outside in the winter when humidity is high. Vehicle has never seen a salt road. I did coat all the brake lines with fluid film. Vehicle is 100% rust free (so far)


I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0
Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219162 09/21/19 07:50 PM
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atikovi Offline
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Originally Posted by littleant
My concern are is moisture getting inside the running gear -frame-door and fender panels.


Running gear is coated in oil so no problem. As long as the frame door and fenders have solid paint, no problem either. I'd be more concerned with mold on the interior. I've had a few cars with all the plastic and vinyl covered in green fuzz after a few months.

Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219182 09/21/19 08:08 PM
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littleant Offline OP
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Thanks atikovi . That's what I was hoping to hear about the body and running gear. Vehicle is a 2010 and the interior is mint (show room). Still smells new.


I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0
Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219208 09/21/19 08:37 PM
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You still need to get some ventilation in that garage. It’s not just your vehicles that are getting damp.


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Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219278 09/21/19 10:02 PM
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Had this problem in the barn. turned out to be a high ground water. Fortunately the ground slopes away out back so a perimeter drain installed about 4 feet down took care of most of the problem. Wet weather in Dec will still cause moisture on the inside of windows and tools like drill press etc.


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Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219330 09/21/19 11:35 PM
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I dealt with a similar issue. My summer camping vehicle is stored in my garage over winter. Last year’s winter, the brake disks were covered in rust. Worse yet, rust had creeped all over the vehicle, the valve cover, random nuts and bolts. I was so disappointed. My spotless camper car was showing its first signs of rust. I tackled the issue here on BITOG.
With the help of forum input, I determined it was due to condensation of cold bare metal with warm humid air. So all exposed metal was rusting. The solution? I thought about dehumidifiers, but the garage isn’t sealed. I considered leaving the daily driven car outside the garage, but that sure isn’t worth it in the peak of winter.
Turns out the solution was something called Car Jacket. It’s basically a sealed tarp cover. You drive the clean, dry vehicle on top the jacket, then wrap and zipper up the entire thing, like a bubble. You throw in some carbon bags to absorb any residual moisture and lock it up. I was absolutely ecstatic with the results. After 6 months of storage, the brake calipers were EXACTLY the way I left them. Tiny little rust spots from washing the car. The car Jacket is the ultimate car storage solution to prevent moisture damage without outrageous electric bills.

Re: Garage high humidity floor wet vehicle inside. [Re: littleant] #5219335 09/21/19 11:42 PM
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Originally Posted by littleant
Some good advice. Winter is worse then summer believe it or not. I think I will put it outside in the winter when humidity is high. Vehicle has never seen a salt road. I did coat all the brake lines with fluid film. Vehicle is 100% rust free (so far)


You could try a window air conditioner for summer, and install a gas heater for the winter. Both will help mitigate moisture.


I use the overseas manual to choose my viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 154k, SS 5w30/Amsoil

His: 2015 4Runner 60k, SS 5w20/Amsoil

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