 | Home > Technical > Visco fan in high altitude |
 
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| bpman Member Since: 21 May 2008 Location: Oslo Posts: 8069  
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IMHO: altitude should not make any difference, the fans speed is dictated by the viscosity of the oil in the viscous unit and the temperature.
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16th Mar 2012 7:38am |
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| mudrut Member Since: 29 Feb 2012 Location: Stourport-on-Severn Posts: 80  
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Echo what the BP-meister says.
I regularly use my vehicle at around 2600m (accompanied by customers in their 2.4 TDCi vehicles) and have not noticed any noise from theirs or mine. Is your vehicle and air-con model? Also, does it make a difference what the external temperature is? Finally, did you notice any fluctuation of the temperature gauge from the norm? regards Ian |
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16th Mar 2012 9:05am |
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| The Boy Member Since: 28 Aug 2008 Location: East Northants Posts: 1459 
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I've done 10,000ft in my tdci and did not run with the fan constanly on.
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16th Mar 2012 9:16am |
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| AlpenAndes Member Since: 20 May 2011 Location: Currently Chile Posts: 128  
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Thanks for the replies so far.
The car got AC, but it does not matter if that is on or off, the fan keeps on turning. I anyway switch the AC rather off. I did not notice a change in the temperature gauge and we are talking about temperatures above 10°C where I noticed it. At least I do not remember right now what it did in winter time when it was below zero. Then I will keep on discussing with the dealer. Although that may mean they will have to an extensive test drive. |
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16th Mar 2012 1:09pm |
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| Eduardo Member Since: 28 Aug 2008 Location: RegiĆ³n Metropolitana Posts: 2110  
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AlpenAndes,
In same conditions in Paso Libertadores (3.000 mts), Los Andes (3,500 mts), Valle nevado (3,000 mts) and El Yeso (2,700 mts) I didnt remember that the fan was working all the time. Cheers Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo"  Click image to enlarge |
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16th Mar 2012 1:39pm |
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| wslr Member Since: 18 Jul 2010 Location: Wellington, Somerset Posts: 581
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There is a barometric sensor in the Powertrain ECU, but this tends to make changes to the way the turbocharger operates.
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16th Mar 2012 5:19pm |
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| bpman Member Since: 21 May 2008 Location: Oslo Posts: 8069
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the viscous unit may be faulty, try changing the fan unit
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16th Mar 2012 5:39pm |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816 
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you can test it. when the engine is cold and not running, contact off, try to move the fan with your hand. if it runs freely all is ok, if it does not, it is faulty. by the way a viscous fan always turns when the engine is on, never sits still, albeit does not turn at full speed if it is not necessary. when driving in the mountains, my personal experience is that the engine needs to work harder, and fan more often than on flat surfaces will keep turning at higher speeds in order to cool everything down. You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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18th Mar 2012 2:34pm |
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| AlpenAndes Member Since: 20 May 2011 Location: Currently Chile Posts: 128
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Thanks ericvv, will check that next time if the fan moves freely.
Guess that also cost some hp of the anyway few the thing carries originally. Eduardo, all this nice places with the fan running as well when crossing Paso Sico 4100, San Francisco 4700, Agua Negra in 4700m this summer before the Bolivian Winter. Had to leave Paso Pircas Negras for another year, Carabineros said it is not recommended after the rain started and saw on Ruta 40 what it means when the rain in the Andes washes away a road. Saludos Oskar |
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18th Mar 2012 10:53pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2455 
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Probably at those altitudes you need to push the gas pedal more than usual which makes the engine hotter and you can not be see any change on the temp gauge. Over 95° or do I can hear the fan spinning. Puma 110" SW
............................................................. Earth first. Other planets later |
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18th Mar 2012 11:12pm |
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