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Old 11-03-2010, 08:50 AM   #1
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Location: Cincinnati, OH
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air dryer haldex

How do I service this unit and the rest of the air system?

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Old 11-03-2010, 09:30 AM   #2
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Check out this thread.

Haldex PURest air dryer - ANOTHER part to service !

Jerry and Judy Davis
Fremont, California
05-06 36'FDDS
toad 2012 Jeep Wrangler Sahara
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Old 11-03-2010, 11:37 AM   #3
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Location: Ontario, CA USA
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Hello & Welcome tjshively:
I am assuming you own an Alpine. It would be helpful if you provided the year and model of your Alpine since they did change a few things over the years. Even if you do not own an Alpine it is relatively easy to change the desiccant cartage. First you must drain the air in the system. The air drain is located in the engine service compartment and has two valves with one which will open to atmosphere. (NOTE: failure to drain the air can be very dangerous) Once you drained all of the air you can disconnect the air hoses at the Air Dryer and remove the bolts around the canister. Once the bolts are removed the canister will lift off and you can unscrew the desiccant cartage. Take a picture of the air dryer or take it with you to a Truck Parts store and get a new/rebuilt desiccant cartage. When I replaced mine I purchased the desiccant cartage first and had to leave a core charge which was more than the replacement desiccant cartage.
Reverse the removal procedure of the desiccant cartage and you’re done.
Dave Fernandez
2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
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Old 11-05-2010, 02:26 PM   #4
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Location: Auburn, CA, Havasu, AZ & Mulege, BCS
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TJ- you should have an air-purge valve by the air chuck which should be the low point for the lines/tank that sets above the rear axle. Drain the valve of any accumulated water which should be minimal, maybe every month.
Jerry's link tells you all you need to know on the air dryer service including part#
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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