[Bob]

Agreed! I will continue to pursue and probably have a “duh” moment when I figure it out. I will try Prevost next.

[Bob]

I have 3 gauges, front/rear and Aux, the front and rear is hold at near 120, the aux gauge stays on zero. Even with the engine running you can hear a loud air leak noise coming from what I thought was a pump above the rear drive axle. On the bottom of this device in the center of the housing is what could look like a diaphram with an 11mm nut on it, the air is strongly coming from that spot, when i turn the nut it changes the sound of the leak and if I push up really hard on it I can almost make the leak stop. When i use the brakes the front/rear level drops and I get a low air pressure alarm. Thank you soo much for the help.

[Bob]

Obviously Tom trades everything he owns often. Buses, cars, homes and planes.

I don’t believe he has traded wives. Nancy is a keeper.

[Bob]

Jon: What do you THINK I meant?!

[Bob]

Sure sounds like a grounding issue. I would check the transfer switch, grounding on both inverters, grounding at the battery to frame connection(s) and grounding at the 120vac breaker box.

Jerry

[Bob]

There is no doubt asking a question here for example is an easy way to get information.

Having said that however there are certain things to keep in mind. Not everyone is aware someone else’s coach may not be like theirs and may provide an incorrect answer. We have a lot of helpful and smart members and we try as a group to not mislead, but when it comes to supporting a coach the information has to be correct. Your life is at stake.

But very few members ever take advantage of the Prevost Car web site for information and I want to keep reminding members that information is a few key strokes away. The more members use that site, the more correct information gets posted and that is a good thing.

I was not being critical of your response but just wanted to point out some things are so critical a forum response, no matter how valid it seems just has to be verified, and supporting the bus is one of those critical things.

[Bob]

Damn. You just used 100% of what i thought I knew about making the A-B work again.

[Bob]

Learned valve is the Prevost factory installed at time of original chassis build that opens or closes aux air to the slide out controller.

[Bob]

If an expansion valve goes bad it can do a lot of stuff being discussed. You need gauges on that system because they will tell the story.

I have never heard of system venting to atmosphere unless something was a really high pressure, such as an expansion valve not allowing flow, and that could also contribute to what seems like intermittent refrigerant levels in the receiver.

Gauges. Watching them as a stabilized system cycles is probably going to reveal the whole story.

[Bob]

gmjdw,

Not sure if you have the same setup as my 1999 w/OTR but it sounds similar. To access the driver side fan motor you will have to remove a substantial portion of the dash and go through the floor if you want to go at it from the inside. Joe Camper, after going through this process, suggested that it might be much easier to remove the center exterior skin and get to it from the outside. After looking at both possibilities I decided to go the exterior route. This requires drilling out all rivets holding that panel in place in addition to removal of all trim. Be advised that Prevost used double sided tape to secure the exterior panels in addition to the rivets. I fashioned a 4′ long piece of 1/8″ x 2″ flat bar into a tape cutter by sharpening one end and pushed it between the skin and the frame to cut the tape. It was much easier after using a heat gun to warm the stainless. Be aware that it is possible to put a permanent kink into the skin if you rush this process. Being the first time (and the last) I worked real slow. Once I was able to remove that panel I was able to stand up and work on the fan motor. I still had to cut a small metal bracket out of the way in order to get to the hose clamp that was holding the fresh air intake hose (4 inch) blocking the motor and mounting bolts. Once all was opened up I cleaned and touched up everything knowing that I was not going back in! Removing the tape still attached to the frame and backside of the skin was simply a lot of elbow grease using a putty knife and heat gun. Replacing the skin I used 3M double sided trim tape (online and at some auto stores) and rivets that I ordered from Prevost. These are SS and will require more than a one-handed rivet tool to install. I used a pneumatic rivet tool. Work slowly and from the middle outwards. It helps to insert a dozen or so rivets ahead of where you are riveting to keep the panel aligned. I also put a dab of Sikaflex on each rivet to help waterproof the connection.

I apologize for the tomb but this was an involved process even if it was not particularly technical in nature.

Doug

[Bob]

Looks the same as my 02 Marathon, but yours has some compression fittings, so someone has changed out the push in fittings which is good.

[Bob]

Thank you Dick , Yes we take the coach everywhere . Wife fears we might be stuck far from home . me Home is where my coach is , she on the other hand feels safe here . I will check PC often and take note of any travel updates. We are stocked up and ready to roll . Thank you for the feedback . You enjoy your trip also , i did your run 2 years back look forward to doing it again .

[Bob]

Di and I are going no matter what the decision.

[Bob]

Out web guy is checking this out.

[Bob]

I think this is what happen to me, I can’t seem to find any leaks, can that valve fail and open up? Or maybe the fans didn’t kick on 🤔 but it is exactly as you describe. What Freon is used on our rigs and how much to fill the system since now mine is empty? Also what should the pressures be on the high and low side?