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Old 03-14-2019, 11:19 AM   #1
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Air Dryer Maintenance Question

It's been 36 months since I changed the AD9 Air Dryer Desiccant Filter cartridge on my 2011 Meridian. Last time I simply replaced the cartridge and called it good, now I wondering if the purge valve needs to be replaced or rebuilt? As I look through Amazon for a desiccant cartridge I see purge valve rebuild kits as well as purge valve/heater replacements. What are the thoughts on this?

Thanks,

Albert
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Old 03-14-2019, 12:20 PM   #2
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If it ain't broke, don't fix it. The valve can be replaced with a pipe plug on the road until you get a new one, and if you don't do a lot of cold weather travel (below freezing) the heater is a waste. I traveled 3/4 of the Alaska Highway with a plug replacing the valve when mine wouldn't seal.
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Old 03-14-2019, 01:46 PM   #3
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Don't have the same coach, but do you hear it purging when you initially start up, after camping? If you hear that, you may also see some "wet" under the valve. If it's working and not leaking, I'd just leave it alone...
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Old 03-14-2019, 07:02 PM   #4
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the valve can be had from NAPA. $20
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Old 03-17-2019, 08:51 AM   #5
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Quote:
Originally Posted by NMBluept View Post
It's been 36 months since I changed the AD9 Air Dryer Desiccant Filter cartridge on my 2011 Meridian. Last time I simply replaced the cartridge and called it good, now I wondering if the purge valve needs to be replaced or rebuilt? As I look through Amazon for a desiccant cartridge I see purge valve rebuild kits as well as purge valve/heater replacements. What are the thoughts on this?

Thanks,

Albert
I forget the maintenance cycle but itís a short one; I replaced mine because it was leaking. They operate in a plastic/composite housing that seems almost designed to wear out; if you hear any air leaking after the system has filled and purged you should for sure replace it, otherwise itís just a case of following the routine maintenance, or not. My guess is most people wait for a leak. The maintenance kit is easy enough to do and not expensive.
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Old 03-18-2019, 09:26 AM   #6
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Thanks for the replies. Since the air dryer is working just fine I think I'll pull it off, clean it up, replace the desiccant cartridge and put it back on. I'm all about if it ain't broke don't fix it, but the coach has just over 36 K miles since the last desiccant cartridge change so it is due.
Hey Pigman, gotta wonder if you had replaced or rebuilt that valve maybe you wouldn't have been crawling under your coach somewhere on the Alaska Highway - could have been drinking beer and enjoying the scenery :-)
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Old 03-18-2019, 03:48 PM   #7
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Quote:
Originally Posted by NMBluept View Post
Thanks for the replies. Since the air dryer is working just fine I think I'll pull it off, clean it up, replace the desiccant cartridge and put it back on. I'm all about if it ain't broke don't fix it, but the coach has just over 36 K miles since the last desiccant cartridge change so it is due.
Hey Pigman, gotta wonder if you had replaced or rebuilt that valve maybe you wouldn't have been crawling under your coach somewhere on the Alaska Highway - could have been drinking beer and enjoying the scenery :-)
Yep, might have, but if I was able to predict the future I'd be in Las Vegas on the craps tables. LOL Actually, it only took about 10 minutes under the coach to replace the valve with the plug, so it wasn't that we lost a lot of time. I'd known it was leaking in Ft St. Johns and had been tapping it slightly to seal it. Worked fine for 2 more days then gave it all up (in a construction zone, of course). I had already contacted Tiffin and knew what I was going to replace it with and had the plug made up out of my this-n-that bin of small parts. Tiffin had said that I could have proceeded on just the plug indefinitely just by draining the tanks daily. Only issue would have been if I was running when outside air temps were constantly below freezing. We still don't carry a spare, but the plug is back in the parts drawer. My valve failed at 45,000 miles but I've run an additional 55,000 on the new one and have not had a whisper out of it. As I said, for this type stuff I'm all for OCM (on condition maintenance). I do just about all the work on our Bus.
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