Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 07-13-2023, 09:57 PM   #1
Junior Member
 
Join Date: Jul 2023
Posts: 5
Blog Entries: 1
Over heating

I have a 2005 Mandalay Thor 40b with a 400 Cummins.I have replaced the temperature control sensor and it is still overheating on grades. I tried unhooking the ground wire. This had previously work and caused it to go to high speed, but now it will not go to high-speed it stays at low speed . any advice would be greatly appreciated. Thank you.
Todd Sissom is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-14-2023, 01:17 AM   #2
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 8,300
What type of fans elect. hydraulic,are we talking electric clutch fan ,is side radiator or rear. Few more facts can help those not familiar with your exact coach but plenty of knowledge.
Cleaning the stack especially on rear radiator is needed sometimes.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 07-14-2023, 10:27 PM   #3
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 32,253
I agree, when was the last time you cleaned the radiator "sandwich"? If you haven't cleaned the radiators recently, buy a few cans of aluminum-safe coil cleaner and follow directions. If you choose to use Simple Green, be sure to buy the aluminum-safe formula. Simple Green Extreme is the name, I think.
Do not use a pressure washer, it will bend the fins and increase over-heating.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;GS Life member,FMCA" My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 07-15-2023, 03:09 PM   #4
Junior Member
 
Join Date: Nov 2018
Location: San Diego, CA
Posts: 22
Overheating

I also have a 2005 Mandalay model 40e
I had the same problems l found out that it had a bad ECM which was replaced by my warranty. It kept the hydraulic pump side draft pump fan from speeding up. Also those years they undersized the radiator. You can turn on the heater valve on to add the extra cooling from those 40ft water hoses.(the old truckers method )
I have cleaned the stack. Keep the engine at 2000 rpms in lower gears. I even took the air conditioner condenser and put 1" spacers to give the stack better airflow. My coach does ok but when it gets in the 90's / lows 100's you just have to take your
time and don't push it. I've had the coach now for about 6 years and it's been a nice rig and comfortable. The driver's side living room slide can have a few issues which l have had corrected
Mandalayman is offline   Reply With Quote
Old 07-15-2023, 03:26 PM   #5
Senior Member
 
znt1186's Avatar
 
Freightliner Owners Club
Join Date: Nov 2014
Posts: 1,185
I have a 2005 Mandalay 40e and also have to keep an eye on the temps. Keeping the rpms up around 2000 is a necessity. I did have to have the radiator replaced last year. The end caps on the old one let go. It does fine now, but I still keep an eye on the temps and down shift as needed to keep rpms up.
__________________
Zeb
2005 Mandalay, 2013 Ford Edge
znt1186 is offline   Reply With Quote
Old 07-15-2023, 03:44 PM   #6
Senior Member
 
Join Date: Oct 2014
Posts: 8,841
Quote:
Originally Posted by Ray,IN View Post
I agree, when was the last time you cleaned the radiator "sandwich"? If you haven't cleaned the radiators recently, buy a few cans of aluminum-safe coil cleaner and follow directions. If you choose to use Simple Green, be sure to buy the aluminum-safe formula. Simple Green Extreme is the name, I think.
Do not use a pressure washer, it will bend the fins and increase over-heating.

Exactly. And you need to clean the FRONT of the CAC from the front-- whatever access you have from the bedroom, closet, etc. You can NOT clean the front of the CAC by cleaning from the back of the coach-- that only cleans the radiator and the vast majority of any dirt/debris will be on the front of the CAC which acts as a "filter" for the incoming air.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
wolfe10 is online now   Reply With Quote
Old 07-16-2023, 11:14 AM   #7
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,810
Quote:
Originally Posted by znt1186 View Post
I have a 2005 Mandalay 40e and also have to keep an eye on the temps. Keeping the rpms up around 2000 is a necessity. I did have to have the radiator replaced last year. The end caps on the old one let go. It does fine now, but I still keep an eye on the temps and down shift as needed to keep rpms up.
I maybe wrong, but (sounds like) maybe you have a FAILING FAN CLUTCH? Which might also explain radiator history? No expert, but I know you should hear the fan roar with moving air when fully engaged hot.
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 is online now   Reply With Quote
Old 07-16-2023, 11:28 AM   #8
Senior Member
 
ArtJoyce's Avatar
 
Monaco Owners Club
Freightliner Owners Club
Holiday Rambler Owners Club
Join Date: Sep 2019
Location: Thornville, Ohio
Posts: 4,091
On a rear radiator unit. I found that my slober tube bottom was about 4 inchs above the bottom of the fan strode and about 3 inches ahead of it. It was ideal to suck the oil drops as they fell out of the tube and blow them through the CAC and radiator. I ended adding a 10 inch hose to the slober tube.

Been sprying the CAC with aircraft simple green and letting it soak and hosing it out. It been three times. It's getting better. But next time I think I will let it soak and use the presure washer with hot water.
__________________
Art & Joyce
Thornville, OH
Kia Soul pushing a 36' DP Endeavor
ArtJoyce is offline   Reply With Quote
Old 07-17-2023, 07:32 AM   #9
Senior Member
 
znt1186's Avatar
 
Freightliner Owners Club
Join Date: Nov 2014
Posts: 1,185
Quote:
Originally Posted by THenne1713 View Post
I maybe wrong, but (sounds like) maybe you have a FAILING FAN CLUTCH? Which might also explain radiator history? No expert, but I know you should hear the fan roar with moving air when fully engaged hot.
Thanks for your advice. Had the system checked out by Freightliner in Gaffney in January when it was serviced. All systems are functioning as intended. It does fine most of the time, but on some long steep grades, the temps will creep up if I let the engine lag too slow. Keeping rpm's up to around 2000, it runs fine. It is a side radiator with a hydraulic fan. This coach has always ran a bit warm, around 202 to 204 degrees. With the fan over 30 feet behind me, I don't hear it running, but I can see the temps come down when it kicks into high speed.

On my previous side radiator coach, I had to have the fan controller replaced to correct an over cooling issue. The fan ran on high speed constantly causing the engine to run too cool. About 185 degrees. It also caused a loss of fuel efficiency. New controller and the engine ran warmer and got better fuel mileage. It ran around 196 degrees to 198 degrees consistently with a new controller.
__________________
Zeb
2005 Mandalay, 2013 Ford Edge
znt1186 is offline   Reply With Quote
Old 07-18-2023, 06:10 AM   #10
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 8,300
Edit ..I may have been more responding to general discussion than to OP as no extra info added or responce.


. The thermal wax valve conversion is popular at least for Monacos that had the electronic control modules. There are some fine tuning for low speed and welding of a bung in radiator pipe for the wax valve . I wouldn't call it painless conversion.
First I would consider the temp. probe and or if high speed fan switch. As well as cleaning the cooling stack.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 07-19-2023, 12:56 AM   #11
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,810
<<the temps will creep up if I let the engine lag too slow. >>

=ANOTHER THOUGHT, you do NOT say Overheat? but... temp creeping up may also be related to TRANSMISSION temp/ transmission cooler/ and higher RPM also put more trans fluid thru the cooler= then cools down trans...more?
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 is online now   Reply With Quote
Old 07-19-2023, 05:25 AM   #12
Senior Member
 
Jzack's Avatar
 
Damon Owners Club
Freightliner Owners Club
Join Date: Feb 2019
Location: Minnesnowta
Posts: 501
Even though you have a hydraulic driven fan it still has a Horton electrically controlled viscous clutch right? If it does, closely inspect the clutch for any signs of fluid loss. It would show up as patches of dust and dirt clinging to the clutch body. If there is fluid loss the fan will never reach full speed no matter what the electronics tell it to do.

This was the problem on our coach and we have since gone to a direct drive Multi-Wing fan. Multiple potential problems eliminated with a direct drive.
__________________
Jeff & Kelly
2008 Damon Astoria 3776 PE
Jzack is offline   Reply With Quote
Old 07-19-2023, 02:02 PM   #13
Senior Member
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,810
<<The fan ran on high speed constantly causing the engine to run too cool. >> Does the engine not also have a THERMOSTAT that should be closing if engine cooler than therm setpoint? Temp CONTROL not usually thru fan control? Fan Control usually just a piece of the pie?
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
THenne1713 is online now   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
v10 over heating jcrowder47 MH-General Discussions & Problems 18 08-14-2007 05:22 PM
OVER HEATING QUESTION Party Barge MH-General Discussions & Problems 21 06-15-2006 05:27 PM
New 400 Cummins Over heating!!! Lucchese1 Winnebago Industries Owner's Forum 8 07-21-2005 08:52 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 03:41 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2025, vBulletin Solutions, Inc.