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Old 07-30-2007, 09:55 AM   #21
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Because I have the exact same problem (go figure..), I just didn't want to sound redundunt

There's another thread concerning this that I started a little over a month ago, and still need to chase mine down as well. On thing I have noticed is that when the A/C is on Max, that there is very little air out the vents. Hopefully this is related and not yet another problem.

Thanks for the chart!
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Old 07-30-2007, 10:08 AM   #22
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I just noticed in the past two weeks I have what sounds like the pump problem too.

Also, similar to Jeff sometimes when the A/C is set all the air goes to the defrost vents and stays there no matter the setting. If turn the ignition off and back on the problem will go away.

With the good informatio here I'll take a look later today and see which version of the problem I have.
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Old 08-05-2007, 07:04 AM   #23
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Finally got around to fixing my version of this problem. It's kind of like having HMO's or an ER. If it isn't broken and bleeding then it takes a long time to see the doctor.

Jeff posted a picture of the vaccum pump previously but no one has posted pics to of the vacuum lines/connections. So here's my contribution.

Here's the "green" line (coolant mix control).
Here's the "blue" line and "softball" (outside air vent control).
The green line connection was the source of the leak with a split hose.
I had some Viton tubing with the right ID which will now probably outlast the coach. Cut it a little long for a better fit/seal of the off-angle metal tube connector.
I ran the AC controls through the different settings to verify operation and listen to the pump come on now and then as vacuum was used up.
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Old 08-07-2007, 02:00 AM   #24
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A little late to the party but I had the same issue and the tech at my dealer told me to get a piece of fuel line and make the same repair described by VICSRYD. He said it is very common and proved it by going immediately to the spot pictured above and pointing out just what is shown. If you are on the road and need to, a short piece of electricians tape will also repair the existing hose so that it can be reinstalled till you get a replacement.
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Old 08-09-2007, 11:08 AM   #25
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Just fixed mine today. Bought a small piece of vacuum hose/windshield washer hose from Advanced Auto. $.75 a foot. I have a little extra now I used about an inch. Pumped stopped running. Thanks for the Pics. Great job IRV2
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Old 08-10-2007, 05:23 AM   #26
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I don't have this problem yet. However I think the photos provided by vicsryd are outstanding and very very helpful. Great information to put in the memory banks.
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Old 08-11-2007, 10:26 PM   #27
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(sure wish I could remember how to make these smaller and clickable. Oh well..)

Well lookie here.....


Thanks to Jon & Tom, this was a no-brainer. I didn't see the damage right off, but could feel it. The pic above was taken around the backside. This was a simple fix, I removed the damaged tubing, the tiny little pipe and installed the elbow boot direct. Like this (wht the heck didn't they do this at the factory?):


I also discovered the <span class="ev_code_BLUE">blue</span> pipe was looped and wrapped around the wire harness below. I unwrapped it and installed a couple of pieces of Slitwrap that hold it much nicer than factory. It's also a nicer sweep to the modulator now:


Here's the modulator:



I'll probably go back in there at some point and clean it up a bit.
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Old 08-12-2007, 04:18 AM   #28
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Jeff.Thanks Thats it. Now all I have to do is find the leak. The other pics must be newer Rigs.

Tom Thanks for the PDF


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Old 08-12-2007, 11:47 AM   #29
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DOH!!! Why didn't I think of just removing the stupid metal tube.
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Old 08-15-2007, 02:30 PM   #30
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Looks like this must be a common problen. Checked mine today and found the connector cracked at both ends. Thanks to all for great pix.
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Old 08-15-2007, 03:04 PM   #31
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Whoops! Hold the fone...Both ends? What did we miss?
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Old 08-19-2007, 03:19 PM   #32
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Well, here's yet another example of what a fine resource IRV2 can be. I discovered my vacuum pump running all the time, so I did a search on IRV2 & found the solution within a few minutes - with great photos of the exact problem. I went to the local parts store & 71 cents later had the problem fixed. Great job forum members. Thanks for sharing.
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Old 11-09-2007, 12:54 PM   #33
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Wow, what a great forum. My vacuum pump was running all the time on "Off" and "Max Air". Using the suggestions on this forum I found the green hose completely disconnected from the water valve. I reconnected it and the problem is almost solved. The vacuum pump still runs about every 30 seconds, so there must be another leak somewhere. I checked the blue line, that is tight and no leaks. I can't find the vacuum modulators located on the plenum, does anybody know how to access those??
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Old 11-10-2007, 06:28 AM   #34
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Check all those little 1/4" hoses up under the "hood". I'll bet one of them has dry-rotted and cracked.
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Old 11-11-2007, 08:11 PM   #35
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I just had to jump in and make this thread even longer. I just wanted to thank "vicsryd" and "SEVJeff" for the great pictures. I had the same problem a few weeks ago and with these pictures, I was able to find the problem right away. What a great site!!

Note: Just retired this week and heading out in two weeks to spend the winter in Arizona. Yea!

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Old 11-12-2007, 01:25 PM   #36
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Wowser. We had this problem crop up a month after we got our unit. No one in our Winne caravan (in September) knew what the problem was. Now we do and will pass the info on ~~ DH fixed it today. The guy at the hardware gave him a 2-inch piece of rubber tubing.

Thanks for the pics and tips....agreed, this is a terrific site.


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Old 11-13-2007, 07:30 PM   #37
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Unless yours is different than mine you don't need the tubing or the little metal 'L' tube. Chuck both and plug it in direct.
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