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Old 11-24-2017, 10:35 AM   #1
ExPatNW
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Problem winterizing 3790RD

Wondering if I can pick some of your brains...

I have winterized our old Montana (with convenience center) for the last 6 years with no problem.

This year is the first time with our 3790RD. I have emptied the hot water heater, drained the tanks and low points.

Now I attached a short hose to the winterization entry hose point, and turn the hot water bypass to bypass and the fresh water tank bypass to winterize.

I put the hose into the tank of RV anti-freeze fluid and switch on the water pump. The pump seemed to have problems sucking in the antifreeze fluid. When my wife inside the rig open a faucet, she got a dribble of anti-freeze and a lot of air.

We could easily use 2-3 tanks of anti-freeze on our old rig (but it had 3 sinks, 2 toilets, shower etc). While this rig has less, it should easily have used a bottle or too of fluid right? We used next to nothing.

I will take the unit to Camping World tomorrow to fix, but I am concerned I am just doing something wrong and if I knew what it was I could save myself a trip...

Any ideas?

Thanks
Chris
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Old 11-24-2017, 10:51 AM   #2
BB_TX
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This has been a common problem getting the pump to pull the antifreeze. Someone recently posted about it, contacted Keystone, and they apparently agreed it was a problem and is having the dealer winterize it for free.

Make sure you have a very good seal at the hose connection. The least air leak will prevent the pump from pulling the antifreeze. Sometimes the rubber gaskets have little ridges on them and sanding them smooth will help. Sit your antifreeze bucket near the level of the hose connection to reduce height of lift. And try opening a low point drain first to see if you can get flow established before moving on to inside faucets.
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Old 11-24-2017, 10:54 AM   #3
ExPatNW
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Thanks - this makes sense and is worth a try.
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Old 11-24-2017, 11:11 AM   #4
topjustice
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The other thing I discovered besides having a good connection is to NOT empty the water from the lines before starting the antifreeze pumping. It seems that the pump works better when it is pushing out the old water while sucking the antifreeze in. Just a thought.
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Old 11-24-2017, 11:19 AM   #5
RichR
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doing mine I have to hold the antifreeze container up high above the intake- a pain but it works well that way.
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Old 11-24-2017, 11:38 AM   #6
ExPatNW
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Thanks all - sounds like I am not the only one to have problems. will try these ideas this morning.
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Old 11-24-2017, 05:50 PM   #7
Md.FireFighter 3791RD
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Turn the screen around backwards so the point of the screen pushes the valve in were you hook the pink stuff hose up to it. Had the same problem with mine 2016 3791rd my first time doing it and it did the same thing yours is doing so called the dealer and talk to a service guy, told me to do the screen /filter thing backwards and worked perfect. Dont forget to turn screen back around after being done or water will come out of the winterizing port when hooked back up to campground water again. Hope this helps.
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Old 11-26-2017, 11:33 AM   #8
ExPatNW
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I will try this for sure. I am convinced the problem is at the point the hose attaches in the convenience center as there is a lot of "air" type sound there when the pump is trying to pull in the fluid. Thanks - if this works as you say it will it will make a big difference.
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Old 11-26-2017, 11:54 AM   #9
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ExPatNW, Your not the only one having issues with this. There are a couple other threads already on the subject. We had the EXACT same issue on our brand new 381TH. There has been some discussion that Keystone may actually be about to recall the check valve on the "winterize" connection as it doesn't work well. I think some of the suggestions about turning the screens around on that connection are working toward holding that valve open? This is on our list for the dealer when we take our rig in for its first inspection.


The other three suggestions are:
1. Leave water in pump so it is primed.
2. Make sure connections are tight so you don't suck air into pump and air lock it.
3. Keep the anti freeze above the pump level so that gravity will help feed the pump. One person even suggested using a 5 gallon bucket with a connection on the bottom of it sitting on a tall ladder. That might be overkill but it should work for sure!
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Old 11-26-2017, 01:09 PM   #10
Jeff_filipiak
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Winterizing our 3731fl

Thank you to everyone who provided solutions for Keystones work around. My pump was not pulling from the anti freeze bottle as well. I added a screen to the connection and it depressed the valve just enough to pull. Buy a screen that's deep enough to depress the valve and it should work. It did for me.
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Old 11-26-2017, 01:17 PM   #11
mtlakejim
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You know I wonder if removing the factory valve and just installing a shut off valve on the outside would work?
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Old 11-26-2017, 02:13 PM   #12
rohrmann
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Instead of draining everything prior to adding antifreeze to the system, just drain the water heater, switch the valves into the correct positions, and then with water in the lines, start the siphoning process and you will not be sucking air, but will have water at the pump to actually be pumping antifreeze through the system.
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Old 11-26-2017, 02:35 PM   #13
Jeff_filipiak
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Honestly I believe the problem is with the spring valve. The pump was barely pulling but once I pressed the valve in with the screen filter it worked perfectly.
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Old 11-26-2017, 02:44 PM   #14
mtlakejim
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I thought the water pumps were self priming? If that is the case then it has to be an issue with loose or blocked connection right?
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Old 11-26-2017, 02:51 PM   #15
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Honestly I'm not an expert. I just read the threads and posted what I experienced. I suggest following all the suggestions starting with the easiest then going from there. Hope this helps
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Old 11-26-2017, 03:34 PM   #16
mtlakejim
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Sorry Jeff, was not referring to your comment but others. I work in the oilfield which makes me an expert on everything LOL just kidding....
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Old 11-26-2017, 04:15 PM   #17
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No worries. Never took it to heart. Trying trying to learn and share when able
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