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07-13-2023, 09:57 PM
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#1
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Junior Member
Join Date: Jul 2023
Posts: 5
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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.
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07-14-2023, 01:17 AM
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#2
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 8,300
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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
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07-14-2023, 10:27 PM
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#3
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 32,253
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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.
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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
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07-15-2023, 03:09 PM
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#4
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Junior Member
Join Date: Nov 2018
Location: San Diego, CA
Posts: 22
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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
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07-15-2023, 03:26 PM
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#5
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Senior Member
Freightliner Owners Club
Join Date: Nov 2014
Posts: 1,185
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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.
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Zeb
2005 Mandalay, 2013 Ford Edge
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07-15-2023, 03:44 PM
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#6
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Senior Member
Join Date: Oct 2014
Posts: 8,841
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Quote:
Originally Posted by Ray,IN
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.
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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
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07-16-2023, 11:14 AM
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#7
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Senior Member
Gulf Streamers Club Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,810
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Quote:
Originally Posted by znt1186
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.
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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.
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(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
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07-16-2023, 11:28 AM
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#8
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Sep 2019
Location: Thornville, Ohio
Posts: 4,091
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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.
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Art & Joyce
Thornville, OH
Kia Soul pushing a 36' DP Endeavor
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07-17-2023, 07:32 AM
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#9
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Senior Member
Freightliner Owners Club
Join Date: Nov 2014
Posts: 1,185
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Quote:
Originally Posted by THenne1713
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.
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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.
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Zeb
2005 Mandalay, 2013 Ford Edge
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07-18-2023, 06:10 AM
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#10
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 8,300
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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
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07-19-2023, 12:56 AM
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#11
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Senior Member
Gulf Streamers Club Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,810
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<<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?
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(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
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07-19-2023, 05:25 AM
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#12
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Senior Member
Damon Owners Club Freightliner Owners Club
Join Date: Feb 2019
Location: Minnesnowta
Posts: 501
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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
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07-19-2023, 02:02 PM
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#13
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Senior Member
Gulf Streamers Club Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,810
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<<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
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