f438921 Report post Posted July 26, 2023 (edited) Hello, on my 2005 Dynasty the ac was low on refrigerant and I charged it up but the hydraulic cooling fan isn't cutting in when the high side pressure goes up and the high pressure cut out will engage and shut the compressor down and it continues the do this. If I put the fan into failsafe mode by unhooking the module the fan runs continuously and the ac works good. I need to know where to find a wiring diagram or where the fuse or relay is for it or if someone else has had this problem, what was the issue with yours? I just found the problem and it needs a new cooling fan control module, part number is 1090822 and its made by Sauer-Danfoss but not having much luck finding one, apparently its made out of unobtainiam.... Let me know if anyone knows where I can find one please. Edited July 26, 2023 by f438921 update Share this post Link to post Share on other sites
rayin Report post Posted July 26, 2023 From what I understand about the hydraulic-driven fan, there is an alternative to rebuilding/replacing the very expensive Saur Danfloss unit. It's called a wax valve modification. That's all I know about it, an internet search results in many line items and videos. Share this post Link to post Share on other sites
monacoman06 Report post Posted Monday at 09:04 PM I had the same problem with my 2006 Dynasty. I replaced one Sauer Danfoss unit. Monaco has a patten on it and the only place to buy them is from Monaco. I had a second one go bad and the unit did not shut the compressor down in the A/C system and wound up blowing up the evaporator. That was approximately 3 years ago and at the time the Sauer Dan Foss unit through Monaco was over $1500.00. I was fortunate enough to find out about a unit installed by Source Engineering in Veneta, Oregon that cures the problem. It is called a "THERMAL VALVE CONVERSION KIT". My Coach runs cooler now and no more problems wirgth the old Sauer Danfoss unit. It contains a wax valve in it. You can find out more information by visiting their web site at sourcerv.com or Calling them at (458)207-9442 and asking for Jim. As a side note the two owners are old Monaco employees. One is Scott Zimmer who actually designed the Roadmaster Chassis and the other is Jim Walls who was in the Monaco Customer Service department. They have helped me with a number of items and I visit them whern I am in Oregon. Try them out! Jim Rodolph Share this post Link to post Share on other sites
