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Old 09-30-2016, 06:50 AM   #1
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2000 36' Land Yacht XC Diesel
Gaffney , South Carolina
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1st Time Climbing Hills

So since I've owned my first RV (5 years), we finally took a trip up 81 and beyond, to D.C. First thing I noticed climbing hills was that my temp gauge skyrocketed. My on-the-road solution was to force the transmission down which of course reduced my speed and engine temp. Is this "normal"? Or should I have my mechanic look at the cooling system?
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Old 09-30-2016, 08:32 AM   #2
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It is time to get some things checked.

If equipped would be the clutch fan to see if it is engaging. if an electric fan is the thermostat that controls it working and is the fan working.

Radiator may need cleaning, inside and outside.

The thermostat.
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Old 10-03-2016, 03:52 PM   #3
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2005 39' Land Yacht 390 XL 396
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Quote:
Originally Posted by JourneytoRet View Post
So since I've owned my first RV (5 years), we finally took a trip up 81 and beyond, to D.C. First thing I noticed climbing hills was that my temp gauge skyrocketed. My on-the-road solution was to force the transmission down which of course reduced my speed and engine temp. Is this "normal"? Or should I have my mechanic look at the cooling system?
I have the same problem with mine in the mountain passes, and whenever climbing long grades when the outside temperatures are high (90+), and everyone else that I have talked to has the same problem with similar rigs. I down shift to keep the engine RPM above 2000 and it seems to help a bit.

I have cleaned the outside of the radiator, and previous owner told me the cooling system had just be serviced a year ago. So, I don't know.

If you find the solution, please post back here so we will all know.
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Old 10-03-2016, 04:23 PM   #4
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Currently we are in New Mexico, coming from Texas. Slow climb most of the way, I had installed a new radiator and thermostat along with change trans fluid and filter. So far temp is good thru Albuquerque.


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Old 10-04-2016, 06:11 AM   #5
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2000 36' Land Yacht XC Diesel
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Replaced thermostats (2) last fall. I have an appt. with my mechanic and he will look it over. I'll report what he finds and if it helps the issue.
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Old 10-04-2016, 06:56 AM   #6
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1989 34.5' Airstream 345
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Kota found a source of his overheating issue in his D P classic. To be built up oily gunk between elements of the radiator assembly.

Couldn't be seen till they were separated.

He shared good details in his posts in the classic Moho thread, And is very helpfull. Send him a pm
Or look thru his old posts.

Temps skyrocketing does not sound good.
Hope this helps.

Cheers Richard
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Old 10-05-2016, 12:30 AM   #7
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1966 26' Overlander
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1st Time Climbing Hills

I am not totally up on diesel engines, but it used to be that the optimum rpm range was from about 1800 to 2300 rpm. This was (is) the power range, and is when the engine runs most efficiently.
To go along with this, at least 2000 rpm is best for an automatic transmission as it locks up and doesn't slip. Slipping creates heat which the trans cooler in the radiator has to try to dissipate. On a long hill, at low engine rpm and under load, the cooling system WILL heat up. Dropping down to the next speed range so the engine turns faster will definitely help.
The addition of an external trans cooler would help also, if you don't already have one.
By the way, the same goes for gasoline engines as well.
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Old 10-09-2016, 08:47 AM   #8
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When I owned the 2001 390XL with the Cat 330, it was plagued with constant overheating issues....a bad cooling system design to say the least. I changed the water temperature regulators (2) (thermostats), re-tensioned the water pump belt, simple greened the radiator and still had the overheating issue. The grill for the radiator is way to small and the hot air gets stuck up top because there is no way for it to get out. If you look at a 2006,2007 you will see that they have an additional grille above the one that the older ones don't have. In addition on my 2007 it has the 400 Cummins, which is much nicer. Also on the 330 Csts you have to buy or make on your own an oil breather extension kit to drop the oil breather tube down 8" or so, so that the oil doesn't get picked up by the fan and clog the radiator. Regards, Bob
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