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Old 07-08-2013, 02:32 PM   #1
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2001 Holiday Rambler Endeavor

My 2001 40 foot Diesel pusher over heats on long hill climbs. Does Someone have an idea on how to fix the problem?

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Old 07-08-2013, 03:29 PM   #2
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Welcome to the forum. On my setup, I have a rear radiator and it was clogged from the motor side by gunk coming from the slobber tube, comes from the vent out of the valve cover. To fix I re-routed the tube so that the gunk no longer collects on the radiator fins. And of course I cleaned the fins of the radiator. I also downshift the tranny to keep the RPM's up to keep the radiator fan spinning fast enough. Others here have more experience and can add to my suggestions. Best of luck.


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Old 07-08-2013, 03:34 PM   #3
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Old 07-08-2013, 03:54 PM   #4
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Like Ron had posted make sure there is a clean flow of air to the radiator, now if that is not the problem, maybe its the way you're driving the rig. Never ever lug on it, (Low RPM)you want to keep it at a good amount of rpm's right at thee power level but not much as to keeping it near the red line(Max) This is just MOHO here. Good Luck! Check coolant level as well!
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Old 07-08-2013, 04:11 PM   #5
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A lot of times overheating is due to a dirty radiator as the others have said. To clean it use Simple Green Extreme which won't hurt aluminum. Spray it on with a garden sprayer and let it soak a while. You need to spray both sides of the radiator for the best result. Then rinse well with water - not too much pressure because those fins will bend way too easy. Start your engine and let it blow through the radiator. Rinse again as needed until you get no more bubbles coming through. I do mine once a year unless I have traveled a lot of dirt roads, then I will clean it as needed. My coach has access to the backside of the radiator through a door in the bedroom floor so I can clean both the CAC and the radiator. Don't know about your access but it should have a way to get back there.
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Old 07-08-2013, 04:31 PM   #6
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What are you using to define overheating? My dash temp gauges are very inaccurate so I go off my data from my Alladin Jr.

How are you driving your DP? Lower gear and higher RPM are better for cooling our rigs due to their design (turbo, fans, etc.). Driving to save fuel works opposite for maintaining engine performance.
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Old 07-08-2013, 05:43 PM   #7
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I have a 2000 Endeavor and experienced same issue. First, the advice you already received concerning the Simple Green is a must to do. I didn't know about the problem and ended up paying a truck repair 2 hours of labor to do the exact same thing. I watched and the junk that came out was scary. You can do it yourself, it just takes a while and you will get messy. Decide whether you want to pay a couple hundred bucks or do it your self. Second, extend the slobber tube at the bottom of the engine about 6". Just get a section of the same size rubber hose and find a connector and a couple of clamps. This will stop the engine from clogging up your radiator and everything in the rear. Third, on long slow climbing grades you are probably driving in 6th gear and don't really notice the engine in working really hard as it will maintain speed. The problem is that you need to down shift to 5th and maybe even 4th depending on the grade. The engine will run faster which is not a bad thing as the fan and water pump are flowing much more coolant through the system. I didn't down shift until a wiser person explained it to me and I would overheat the engine causing the gauge and the warning light to go off scaring everyone onboard. Slow down if you have to but don't lug or overload the engine as more RPMs means more cooling capacity.
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Old 07-24-2013, 07:03 AM   #8
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Just got back from the rockies and my 01 38' endeavor did it to, even downshifting had to keep an eye on it. Also my "Warning" light would come on which I guessed to be exhaust temp from the way it acted, slow down a little and it would go off.
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Old 07-29-2013, 11:43 AM   #9
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I cleaned the rad with Zep degreaser it worked real well lots of crud came out. extended the oil breather tube. We drove from Lubbock TX to Phoenix AZ stayed cool all the way. Thanks for all the info. PS down shifted on the long hills.
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Old 07-30-2013, 08:18 AM   #10
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Cleaned mine this weekend and extended slobber tube out the back.

David and Sue
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