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Old 09-17-2012, 04:49 PM   #1
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Air Dryer

Where can a new air dryer be purchased from and how difficult is it to replace?

Larry 2004 40' MDTS

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Old 09-17-2012, 05:56 PM   #2
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Quick answers:
1. Most anywhere that carries truck parts and supplies will have them or can easily get them. Haldex offers two different types, so know which one you need. A knowledgable parts guy will be able to help.
2. If you have the tools and are fairly strong it's not too bad. As they say, "It ain't rocket science".

'99 Alpine Coach
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Old 09-17-2012, 08:24 PM   #3
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Here's a thread w/more info.
You can find more on air dryer stuff using the search feature from the forum home page.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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Old 09-18-2012, 03:59 PM   #4
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I purchased mine online from NAPA and picked it up at my local store.
Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy
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Old 09-18-2012, 04:45 PM   #5
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Not much can go wrong with them. Filters can be changed. Heater can be replaced.
Air Plunger can be replaced.

Still using the 14 year old OEM on my MH.
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Old 10-18-2012, 12:05 AM   #6
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Originally Posted by alpine4us View Post
Where can a new air dryer be purchased from and how difficult is it to replace?

Larry 2004 40' MDTS

Larry, what kind of problems are you having??? I have a 99 Alpine, the former owner put a drain valve on the air system located in the far rear compartment. I am a retired trucker, accustomed to dealing with air systems, If the filter is full, it will not absorb any more moisture. You can determin this by draining your air system, if it spits out more than just a very breif spray, you may need to replace the filter. If you can access the dryer, its no big deal to replace the filter and or purge valve. When the compressor reaches its max air pressure, the purge valve will spit, and the compressor will shut down. An air governor regulates the compressor cycles. On an 04 model, unless you have alot of miles, your filter should be ok. On my trucks, they were usually good for 300,000 miles or more, dependding on weather conditions. Hope this helps, old trucker
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Old 10-18-2012, 07:29 AM   #7
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A year or so ago, I tried [repeat] tried to order a new dryer filter from a sales tech at Bendix [think the 03s have a bendix filter]. Anyway, the tech asked me what symptoms I was having [eg, excessive water or oil in the daily air drain]. I told him neither so he said he would sell me one if I wanted but it didnt sound like I needed it. Sometimes you have to resist temptation to "fix" something and leave well enough alone--a lesson I relearn almost everyday.

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2003 40' MDTS
Garden Ridge, Texas
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