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Old 08-31-2007, 03:30 PM   #1
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This is for a 2004 Winnebago Sightseer 30 footer on the Workhorse Chassis.
When you pull down the hood and look to the left there is a heater core with a couple of hoses running off it. One of the hoses contains a sort of valve with a vacumm fitting. Well, this valve is leaking. I am guessing this is a bypass valve to control the flow of water into the heater core. There are only two openings on the valve. One for the coolant to come in and one for it to come out.
Workhorse told me it was a Winnebago part. My Winnebago dealer is having a hard time finding the correct part. He did come up with this number:
103930-23-000, 2 way vacuum valve.
Is this the correct part? I am going to remove this valve and install a piece of copper tubing as a temporary replacement untill the part can be found. Will this hurt anything?

Also need help finding a replacement screen for the windows over the couch. The screen is the same size as the one for the windows over the dinette..
Any and all help will be appreciated.
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Old 08-31-2007, 03:30 PM   #2
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This is for a 2004 Winnebago Sightseer 30 footer on the Workhorse Chassis.
When you pull down the hood and look to the left there is a heater core with a couple of hoses running off it. One of the hoses contains a sort of valve with a vacumm fitting. Well, this valve is leaking. I am guessing this is a bypass valve to control the flow of water into the heater core. There are only two openings on the valve. One for the coolant to come in and one for it to come out.
Workhorse told me it was a Winnebago part. My Winnebago dealer is having a hard time finding the correct part. He did come up with this number:
103930-23-000, 2 way vacuum valve.
Is this the correct part? I am going to remove this valve and install a piece of copper tubing as a temporary replacement untill the part can be found. Will this hurt anything?

Also need help finding a replacement screen for the windows over the couch. The screen is the same size as the one for the windows over the dinette..
Any and all help will be appreciated.
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Old 08-31-2007, 05:43 PM   #3
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If you have a Evans/Temcon unit this may help Evans
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Old 08-31-2007, 05:53 PM   #4
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Try going to the Winnebago web site, "Resources","Previous Model Years", then "Manuals and Diagrams". Select the year and then the model of your coach.
Go to the "Windows and Vents" heading and select the window you need the screen. Good exploded diagrams with part numbers.
Hopefully this will help you narrow the search
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Old 08-31-2007, 10:12 PM   #5
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Think I found the heater core and the assocaited parts on Winnies web page....Anyone else have any ideas for the screen?
They dont even show up on the diagrams
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Old 09-01-2007, 08:18 AM   #6
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Snowwolfe, if you contact Winnebago customer service with your VIN and Winnie number, they can look up the exact part you need. They may even have it in stock to ship, or will be able to refer you to the original supplier. I needed to do this for a couple of parts on mine, they were very helpful.
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