<strong>Yahoo Message Number: 11382</strong>Bill,<br/><br/>Could it be the purge valve on your air dryer? I don't have a tag, but my air dryer is located in that area. An air leak somewhere might be causing the purge valve to cycle excessivly - the pumping may be your engine air compressor trying to keep up with the leak.<br/><br/>Good Luck! <br/>Dave<br/><br/>2000 Allure 36'<br/><br/>#30444 Blt. Sept. '99<br/><br/>Bill Harris wrote: