Flyinhy

Yes sir! Painted just like mine.....lol, thanks for the info

Thomas, can you take pics of those? I've got an idea which ones they are but not positive

I'm curious to what you find out. The only difference is my high idle works as it should.

Ray, my system is exactly the one in the picture posted in the email I received from REV with the 2 fan setup. The a/c condenser is mounted on the front of the charge air. None of the paperwork I have with the coach details this system. All of mine says it is supposed to have the Sauer Danfoss electric/hydraulic controller. I believe what Ivan detailed in his post is exactly what's going on with my system. I have a signal coming from the ECM telling the 12v fan controller to spin faster because something is either programmed wrong or I have a bad sensor that I'm overlooking. The wax valve is connected to this 12v controller and that might be the solution in the end. I may end up just installing a new wax valve from source eliminating the old wax valve and the 12v coil system but will that cause higher pressure in my a/c system? I'm not going anywhere for the next 6 months or so until this job ends and that gives me plenty of time to figure out what's going on. I truly appreciate everyone's input, you guys are top shelf!

Ivan that was the first thing I checked and changed. I also bought a new intake temp sensor just to eliminate that. I think you guys are right about the a/c. Without a computer and Insite, I can't check the parameters of each function as described in your previous post. I will go home this weekend and bring back my a/c gauges and 134 bottle. That way I can make sure my high pressure is correct and not triggering that ECM function. Just one step at a time. Thanks for all the input from you guys......

David.....That's my question. The wax valve in Ivan's diagram is called "temp sensor" and the solenoid valve w/ 12v coil is "F3". Why would it have both? A failsafe maybe?

Thanks Ivan, saved the day again. I'm sure there's more involved , intake sensor, water sensor , all signals come through the ECM , that makes sense.... I wish I had access to insite to look at everything but unfortunately I may have to call cummins for this one.

The email I received today. Unfortunately, we have limited information regarding the construction of this RV, as it was built by the previous Monaco Coach Corporation which closed under bankruptcy in 2009. However, according to our service manager: Should have a thermovalve MCC # 2136 (#11 in picture) that is controlled by an electric thermo solenoid kit MCC # 07010906 (in picture #1 down low at the left corner) which is then controlled by the ECM of the engine. If the engine has been re-flashed then the programming has probably been set incorrectly. The other thing is that valve kit could be bad and needs to be replaced. Okay, so according to them, the "wax"(#11) valve is controlled by the thermo solenoid mounted on the side of the radiator (#1)which is controlled by the ecm. Which makes me even more confused. If I take the coil off the single action valve (#1) and the fan goes to idle, shouldn't the wax valve keep the hyd oil from flowing if it's not up to temp.....unless it's stuck open? What would be the downside of installing a separate temp sensor that activates the single action valve on the side (#1)? There The only tmhim g we can suggest is to bring it to Coburg to have us check the ECM parameters and the valves. Attached are the prints we could find.

I bought my coach in a similar way. I knew it needed tons of work from the start. The coach is 20+ years old and nothing worked as it should. I've made a list and I work on that list everyday. Mine had been abandoned and was acquired by a dealer who was going to part it out. I suspect someone was using it as just something to live in and not driving it for years and when some of the systems stopped working , it was just left to die a slow death. Along with people living in it , it had a family of chipmunks also living in it and to this day I still find nuts and traces of Chip & Dale. You can't buy a 20+ year old motorhome and not expect to spend a chunk of cash to keep it road worthy especially if you're not doing the work yourself. Good luck 👍

Congratulations on your new purchase. Plenty of knowledgeable guys on here with decades of experience with these coaches. I haven't had my executive too long but with the advise from other owners on here and a little blood, sweat and cussing , I have brought my old abandoned bus back to life. Make sure you go through all your systems and make a list of all the potential problems. My list grows everyday...... Tires were my main concern. Happy motoring 😉

Yes, One hose comes off the wax valve to the 12v coil. I can take the coil off and the fan runs at idle. So that tells me that valve is working. That also tells me I have flow through the wax valve .....correct? I think I have some sort of experimental system because I haven't seen or read anything that describes my system exactly. What turns on the 12v coil ? The million dollar question.

Okay, I'm officially confused on how this system works now.

Okay, I've spent most of the morning looking for this sauer "fan controller". Does anyone know where this electronic box should be? If I have it, it's well hidden. I see the wax valve. I see the small electrical valve with a 12v coil on it that controls the flow and its not what is described In my schematics. it says engine compartment......that's it. The small valve has two wires coming off the coil not the 6 wires that are described for the FDCA.

I read the whole thread and I'll do some more research. I found this in my second set of schematics.

Hi guys and happy New Year. I'm slowly but surely fixing things on this old coach. I've moved on to the hydraulic fan now and I'm scratching my head a little. Maybe someone can point me in the right direction with this one. Okay.....2001 sig Exec 500 ISM hydraulic fan. Runs at full speed all the time. I went to check flow at the wax valve yesterday and noticed a small electrical coil on a valve before the wax valve itself ....that I've overlooked before. I took the coil off and boom, the fan goes to idle. I looked at my schematics and I can't find the wiring for this coil. I traced it back to a relay in the rear run box on the left. As far as I can tell it gets +power from battery and the ground is the "excite" signal from either the thermostat sensor and or, the intake sensor? I unplugged both sensors and still have full speed fan. What am I missing?

Hi guys and happy New Year. I'm slowly but surely fixing things on this old coach. I've moved on to the hydraulic fan now and I'm scratching my head a little. Maybe someone can point me in the right direction with this one. Okay.....2001 sig Exec 500 ISM hydraulic fan. Runs at full speed all the time. I went to check flow at the wax valve yesterday and noticed a small electrical coil on a valve before the wax valve itself ....that I've overlooked before. I took the coil off and boom, the fan goes to idle. I looked at my schematics and I can't find the wiring for this coil. I traced it back to a relay in the rear run box on the left. As far as I can tell it gets +power from battery and the ground is the "excite" signal from either the thermostat sensor and or, the intake sensor? I unplugged both sensors and still have full speed fan. What am I missing?

Now I'm curious if I have one......I've never seen it if I do.

I haven't had my coach very long but for the last 2 winter seasons I have to "bleed" my heat exchangers when that happens. Especially the living room. The fans will come on but no circulation from the pumps.

Merry Christmas 🎅 Yea, the head unit will have to be replaced with a newer unit. I found one with a remote plug for the rear but I will lose the CD player. The Bluetooth adapter wired right into my bose surround sound unit, so all is not lost. Merry Christmas and a happy New Year to all.....

After a little research I found a basic Sony head unit with the remote feature so if my "MacGyver" fix dosent work, I have a few other options

Sorry guys I've been so busy at work I haven't had time to do much. I finally have a rain day where I can piddle around with this head unit. Yes, the remote is wired in at the back and the picture above is the remote on the side of the cabinet. I've looked a little for a replacement but not seriously. My head unit works with the exception of the CD player. I have it apart now and I think I'm gonna try and add a bluetooth receiver internally before I drop 400 on a new unit. It's worth a shot. The inside of this unit had 20 years of lint on some of the components.

I have the original head unit on my dash. The sony wxc 570 and I was wondering if I replaced it with something more modern with bluetooth, will I still be able to operate it with the bedroom remote? When it comes to computers and tech stuff I'm clueless and not ashamed to admit it. I'd love to be able to use my Iheart on Radio. The bose surround system is something I'd like to update too.

How old is your unit? I just purchased a splindide a month ago. Seems like they would produce enough parts to cover past models....at least 10 years worth.

Most people don't realize how much we depend on trucks. Everything we consume is delivered in some way by a truck. I'm not against the whole renewable energy movement but we rely on diesel too much to just turn the spigot off.

We discussed a diesel shortage last May on this forum and I kinda put it out of my mind until yesterday. I went to fill up and I was told I could only buy 100 gal. I read an article where we are down to a small amount in the whole country. Something like 30 days supply. With winter coming and my main source of heat will be diesel.......this is kinda scary. Is anyone else seeing problems with rationing or finding diesel?