The Windows Fog up ,Side windows ice up in winter. [/align]

 

I assume you mean the inside of the windows? If that's the case, it only can happen if there's moisture inside the van. Perhaps you have a leak and water is getting in somewhere.

 

What type of Ram Van/Wagon do you have? B1500, B2500 or a B3500?

Also, is it a regular Ram Van for cargo or a Ram Wagon for passengers?

The cargo types (work vans) really don't have this problem at all since they are an enclosed box shell of a vehicle.

If a passenger Ram Wagon, is it 8-, 12- or 15-passenger.

All of this makes a big difference dealing with the fogging of the windows.

It seems that the B1500 and B2500 conversion vans have less window fogging than the typical Dodge 8, 12 or 15 passenger Wagons. The reasoning behind this is that the conversion companies take the Ram Van (cargo type) and convert them with their own seats, plushness, and carpeting.

As for the basic Ram Wagons or 8, 12, or 15 passenger using the typical Dodge carpeting and cloth bench seats, fogging is very plenty.

The more the heat is turned up in the van, the more the fogging happens as things defrost on the boots, clothing, carpet and seats. Plus, breathing adds mositure too!

You'll have to play with the temp control setting at just above the middle range and no higher. Next, get some rubber floor mats to place over the carpeting. I've known in some cases people have removed the carpeting and took the Ram Van (cargo) rubber floor and swapped out their Ram Wagon carpeting to greatly reduce this fogging problem.

As for the seats, you can spray a Scotch Guard coating onto them to prevent the fabric to breath. But make sure the seats are clean and low in moisture first.

Much of this problem of fogging is with the 1998 and newer Ram Vans/Wagons when the HVAC system was refreshed to a different design.

If you have a B2500 or B3500 with the rear HVAC unit, try to run it less. In my B2500 2000 12-passenger with cloth seat, and carpeting, I took the rear unit apart and disconnected the electronic actuator. Then I manually put the valves to blow the air to the chest and headliner and not the feet. If air is past to the floor, more mositure is picked up to evaporte to fog the windows !!! The rear unit is made by Denso and the front unit is made by Valeo or Berhe for our model years.

So, this time of year, keep the feet cold to prevent the moisture from getting up to the windows.

Also, there is an outside air valve to the front HVAC system that opens and closes depending on what mode level the air blows to (feet, chest, head). I took off the vacuum actuator that controls this and placed it in full outside air mod. This way, it prevents further fogging of the windows since the air isn't in any recirc.

I live in a very humid mostiure location down the raod from Niagara Falls. So, I can relate to the fogging of the windows and the cold outdoors. Having five or more passengers can make fogging a real challege to control. I would need to crack open the drivers side window the space of an average pencil to aid in the control.

Hope this helps some.

 

BTW, the 1976-1997 Ram Vans/Wagons could get an aftermarket product that helped reduce the fogging. It was called VentGard.

 

Heater core leaking?

 

The van Is a B1500 Conversion van. Stev What you said about the air recirculating and not taking in fresh air makes sense.
Could a vacuum leak cause the vent to not open?

 

Just the opposite. The outside fresh air vent is closed by a vacuum actuator. Lack of, or failure of, any vacuum parts will keep the door from closing and all you will get is fresh air.

 

Now that is really odd why a B1500 conversion will get really fogged up. Our 2000 B1500 PrimeTime conversion rarely had a trace of fogging.

One area to look at is the front passenger floor location where the feet rest. You will see what looks like a metal bar grill. This is the HVAC interior air intake. On my B2500, I've place a sheet of carboard over that open 2/3rds high along with the outside air valve open for only outside air.

I really don't mind the fogging on the rear side windows unless the kids are writing all over them.

 

I found out the fresh air intake vent was stuck in the closed position.
I moved it to the open position and the fogging has stopped.
Although that worked the problem of the sticking Vent doorhas not been solved.
It will not open or close on its.

 

When I changed my heater core a few weeks back I figured I'd clean and lubricate that fresh air door and all the linkage that goes to it. I glad I did that because I found a bunch of dirt and junk inside the front opening of the vacuum actuator. This stuff was keeping the door from operating it's full swing. You might want to pull that actuator out and inspect it.