JohnC3

If you have a blocked check valve, it would be full of cold coolant when4the pump started. If the hose is blocked, the heated coolant cant enter the hose to heat it.

The Aux Compressor is controlled by a pressure switch that the pump plugs into. I believe this has power all the time. When the pressure drops (to 80 I believe) it activates and fills the ping tank (about 3/4 gallon) You could probably put an automotive 12v relay with the pressure switch to allow you to turn it off. I just replaced mine a few months ago once I got the air leaks under control.

We had Conitech (sp?) air bags, and when we looked up the part number we found continental had a good cross reference list. 4 of the 5 manufactures were out of stock everywhere. So we went with Automann and ordered them from an outfit in PA Stengel Brothers (www.stengelbros.net). BTW, our bags LOOKED fine but several were leaking through the rubber (the shop took me out and showed me). Found the replacements for ~1200 for 8 and then ($100/ea) to install at 75 service in Florida. REV Quoted me ~450/bag for the part. Hope this helps,

Hello Everyone, On my Class A (2008 Monaco Camelot 36PDQ) my Air dryer has developed leaks 4 times in less than a year. The 1st OEM (Wabco 006110500 1200 System Saver Air Dryer, Formerly Meritor R955205) started leaking from the regeneration valve in 01/21. We replaced the complete unit with one from amazon. It lasted 4 months and started leaking from the purge valve. We got a free replacement from Amazon and installed the replacement, That lasted about 6 weeks and started leaking from a pin in front of the front air hose. We then got a refund from Amazon and got Wabco OEM. That started leaking after 3 weeks before it started leaking from the regen valve. I replaced all of these myself. These units are located about 2 ft from the engine on a separate mounting pillar. I understand that some units had issues with hoses overheating (some were mounted close to the engine and the hoses were 2-3 ft long). I don't believe mine is that type as it is about 7 ft long (Leaves the dryer travels back around a pillar and connects to what I assume is the compressor.) I replaced all 3 units myself, and am wondering if I missed something in my unfamiliarity with air systems. I unbolted the old units cleaned the threads on the fittings with threads and teflon tape on the fittings. Any thoughts? and Thanks for any help you can give.