I have a 2003 Monaco Cayman with a Cummins. I have developed leaks (cracks) in my radiator coolant surge bottle. Since it is under pressure and plastic, it is almost impossible to repair. I just found out that a different style replacement made of fiberglass (part # 01806583) costs $208.16, plus another $200.00 to update my hookup from the old style top sensor to the new style replacement with side sensor. Anybody out there experiance the same problem? Any reasonable alternatives or fixes? Thanks.
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Monaco/Roadmaster Coolant Surge Bottle
Posted 01 July 2013 - 05:15 PM
I had similar problems with my Cayman's tank. However, mine isn't under pressure and I just sealed the cracks... no problem now.
2009 Monaco Cayman 38PKQ
2011 Honda CR-V
Posted 01 July 2013 - 07:05 PM
I think the plastic tank from Spartan is around $50 and if it last 10 years I would think that would be OK.
Posted 23 October 2013 - 09:35 AM
Thanks for your reply. The problem is that the cool bottle requires plumbing on the bottom and sensors inserted in the top. To complicate the hookup, the bottle is pressurized. Monaco designed the bottle and will not release it for other manufacturers so that Monaco can charge their unconscionable prices. Even worse, they changed the design from top sensors to side sensors which requires new fittings, new sensors, and a new wiring harness. The total to replace the plastic bottle is just a few dollars less than $500, which is so ridiculous that it is hard to even consider without trying a million other repair strategies. Monaco went bankrupt in 2009, so they nearly quit supporting any of us that have models before 2009. The support they do give with parts are a classic case of "gouging." Needless to say, I would never ever purchase another Monaco RV.
Posted 23 October 2013 - 10:28 AM
Duke, is it a overflow tank?
Should that be the case, then it's not under pressure like an expansion tank. The coolant is forced out from the radiator at the cap area when things heat up, into the overflow tank and is drawn / sucked beck into the radiator when the system cools down.
There is a sensor, I think supplied by the company on another page of there catalog and could very well work. I know I read some info. on them in the catalog. will check it out in the meantime.
Posted 23 October 2013 - 12:01 PM
It is called a 'radiator coolant surge bottle.' It has a 15 lb radiator-type pressure cap on the top of the bottle and definitely is pressurized. It has electrical lines that come from the coolant level sensor in the top of the bottle to the warning light on my RV dash. The only replacement bottles currently offered by Monaco have different sensors that are mounted on the side of the bottle requiring new plumbing and wiring. The coolant fittings are on the bottom of the bottle. It is a pretty large bottle, more like a tank. There is a picture of it on my original post above. I appreciate your interest in my problem. Thanks.
Posted 23 October 2013 - 04:00 PM
Andy, that being the case, then you might try these two links. Think race Car surge tanks might work and they are less then the one you are looking at.
One needs to be creative and these tanks are made out of aluminum and might be adaptable, need to see how to attach the sensor.
My surge tank is above the radiator and then an overflow line runs into the overflow tank. keeping the level at the desired level and then the surge tank is always full.
After thought ! could the coolant level sensor be mounted in the overflow tank ?
Posted 23 October 2013 - 05:03 PM
The Canton Coolant Expansion Fill Tank was really interesting and has some possibilities to consider. The Howe tank might not be adaptable due to the locations of the fittings, however, both are better than any alternative I have found to date. I do like the fact that they are metal. They may not contain enough volume or be tall enough to accommodate the top mounted sensors on my current bottle, however, I will need to study my current bottle for adaptation. I wonder what other metal coolant tanks these two companies have that might be adaptable? I have heard of some owners having more than one failure of the plastic bottles. I have read about Monaco owners having metal tanks custom made for them as a substitute for the plastic ones offered by Monaco. They are prohibitively expense to have built ($800?). I am definitely encouraged by your research and findings. You have found more than I did in all my research so far. I have a lot more research to do. I patched the bottle by using a hot putty knife to 'smear' the melted plastic over the pin holes in the bottle and then covered the areas with auto tube patches with a strap around the tank to hold the patches in place under the bottle's pressure. A real Rube Goldberg job! It has held for several months so I can't complain.
Posted 24 October 2013 - 09:33 AM
As a temporary fix I used JB WELD on my tank I sanded the surface and cleaned with acetone. It held with out leaking under pressure. I finally changed mine but it was not as expensive as you have been quoted.
Allison 3000MH tran.
Towing a Honda Civic on a Acmey tow dolley.
Posted 24 October 2013 - 08:42 PM
The price I stated for the parts was given to me by Monaco parts department within the past 60 days. I have the part numbers and cost per item. I will be happy to quote the prices and part numbers if someone is interested. I posted this thread in hopes that someone could point me to a cheaper source or alternative to replace my bottle. If your replacement was cheaper, where did you get it and how much did it cost? Tell me about your rig and what you had to do to replace it. Thanks.
Posted 26 October 2013 - 08:06 PM
Not trying to miss lead you. I don’t have a Monaco product-- see my signature. I bought my tank from the local Freightliner shop. I don’t remember the exact price but it was around$150.00. The problem with the plastic tanks is they are not supposed to be exposed to sunlight. The sun shines right on mine through the lovers in the back. I am going to make a cover that will shade it and hopefully protect it.
Mine was a direct replacement. Had to move the sensor from the old one to the new one but not that big of a deal.
You might look at some of the web sites catering to big trucks. Many carry parts at a discount.
Allison 3000MH tran.
Towing a Honda Civic on a Acmey tow dolley.
Posted 27 October 2013 - 12:11 AM
Being in Phoenix AZ, the sun destroyed mine, I could scrape the plastic off with my finger nail!!! After I put on a new one I protected it with an 2 aluminum pie dishes (they came in packs of 2, didnt have a use for the extra one so I used both), the tank cap holds them on. Since I have to park the coach (96 Monaco) always with the rear facing South (and the vents just let the sun pour in, it was also eating the ducting to the air filter) so I decided to use an old political sign to block the vents...works great; I leave it on for short trip but plan to remove it when I get on the Hwy. If you want pictures, PM me via IRV2...handle, arvowl Good Luck Paul
Posted 27 October 2013 - 03:15 PM
I live in upstate NY and use my Monaco for many weekend trips and two one week trips in May and October, all dry camping, so I don't have the same problem as you do. My RV faces west when parked, so the back does get plenty of sun every day. When I finally replace the bottle I may add a shield to protect it if I ultimately use another plastic bottle. I appreciate all the replies, information and suggestions. I guess I have my work cut out for me to continue to research my bottle replacement project and replace my bottle in the spring.
I have winterized my RV and put it away for the winter.
I am leaning toward finding and modifying a metal bottle/tank when I start looking in the spring. I would appreciate more information or experience that anyone has regarding my bottle replacement.
Posted 27 October 2013 - 06:58 PM
Try this link:http://www.nwrvsuppl...ategory_Code=05
Scroll to near the bottom of the part list. This is what I used for my 2000 Diplomat. There is a difference in the low coolant sensor relocating to the side. I got this Keith Puckett in Indiana (574-612-4722). MH is in shop now so don't have address. You will have to lengthen the 1/4" line and the elec. wire to the sensor. The part to lengthen are hardware store parts. Hope this helps. Less than $225 total.
Posted 28 October 2013 - 04:00 PM
That is definitely the bottle for $175.00 versus from Monaco for $208.16. How about the the side sensors? Where did you get them? Right now I have top sensors. Monaco has the side sensors to replace them at $49.50 plus shipping. They claim a new wiring harness for $131.65 is needed to change from a top sensor to a side sensor. You said all it takes was to extend the wires, which makes sense to me. Get back to me about the replacement sensors. Your process and references cuts the cost in half. I can live with that amount. Great info and help! Thanks.
Posted 29 October 2013 - 05:15 PM
Try this: Keith Puckett in Indiana: 574-612-4722. This is where I got mine from. Hope this helps.
Posted 04 November 2013 - 09:25 AM
This may help, go on u-tube and check out Source Engineering, they show a tank they have developed for Monaco motorhomes. The tank is made out of Aluminium and has a site window in it. Hope this helps, smokeater75
Posted 04 November 2013 - 10:59 AM
Here is a direct link: https://www.youtube....h?v=XCv8M-q80Lc
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1997 Safari Sahara 3540
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