Home > Maintenance & Mods (L322) > Viscous Fan to Electric Fan / Cool running 4.2 SC in testing |
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andyt109 Member Since: 23 Nov 2020 Location: London Posts: 29 |
Hi All - 2006 4.2 SC
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4th Jan 2021 12:04pm |
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Strider Member Since: 08 Jun 2015 Location: Hertfordshire Posts: 500 |
Hi Andy,
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4th Jan 2021 1:47pm |
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dingg1 Member Since: 29 Jun 2013 Location: PORTUGAL Posts: 1339 |
Your temps are running a bit cold. Should be around 95 normal running afaiu? |
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4th Jan 2021 2:27pm |
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maric995 Member Since: 04 Apr 2019 Location: zagreb Posts: 58 |
Normal coolant temperature should get to 88-91 in winter driving, you should check thermostat, it is fairly easy to replace, you can check for video ''atlantic british coolant thermostat replacement'' on youtube.
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5th Jan 2021 7:19am |
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andyt109 Member Since: 23 Nov 2020 Location: London Posts: 29 |
Thanks all for your responses.
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5th Jan 2021 8:42am |
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Danwilderspin Member Since: 15 Jun 2016 Location: Cambridgeshire Posts: 2214 |
May I ask what the point of this conversion is? Current stable:
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5th Jan 2021 7:21pm |
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andyt109 Member Since: 23 Nov 2020 Location: London Posts: 29 |
Viscous fans are unreliable, limited air flow at idle, bulky large cowl which obstructs front of engine access, sap power (although negligible), make an awfully loud fan noise at engine speed which detracts from the v8 sound (sounds so much better when it's disengaged/not fitted), to take on and off for belt changes whereas electric fans stay fitted, more custom control of when cooling starts and stops, you can over ride electric fans to on if you are about to put the engine under heavy load to prevent a heat spike... Amongst other things.
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5th Jan 2021 7:46pm |
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Danwilderspin Member Since: 15 Jun 2016 Location: Cambridgeshire Posts: 2214 |
No not at all I was genuinely curious... isn’t there a legacy plug iirc for an electric fan left from the BMW era is this connected?
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5th Jan 2021 7:55pm |
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andyt109 Member Since: 23 Nov 2020 Location: London Posts: 29 |
That sounds interesting, I'm not sure! Would be good if there is. If you have any suggestions as to locations / circuit diagrams etc that would be appreciated.
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5th Jan 2021 8:24pm |
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dingg1 Member Since: 29 Jun 2013 Location: PORTUGAL Posts: 1339 |
The fan on the 4.2 sc is not just a viscous fan its also controlled by various inputs electrically, I'd leave well alone tbh |
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5th Jan 2021 8:28pm |
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andyt109 Member Since: 23 Nov 2020 Location: London Posts: 29 |
I did think of that, but also run it for 5 days without it at all and no alarms whatsoever. All inputs arent heavy enough gauge fan current, so must be control only. I would imagine: ground, clutch control low speed, clutch control high speed, and possibly some sort of PWM return to to Ecu to check its speed. Although it's not flagged any faults up so far, so not sure what else they could be. Perhaps someone can shed some light on that. |
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5th Jan 2021 9:19pm |
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dingg1 Member Since: 29 Jun 2013 Location: PORTUGAL Posts: 1339 |
I wouldn't remove the viscous fan, aircon has an input as does gearbox temp.
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4th Feb 2021 4:02pm |
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Jayk69 Member Since: 08 Feb 2018 Location: Daventry Posts: 601 |
cool running engine would suggest an issue with thermostat either the seal or the wax in it has broken down.
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4th Feb 2021 5:48pm |
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ur20v Member Since: 19 Feb 2019 Location: None Posts: 634 |
A properly functioning viscous fan performs very well with very few down sides. Note it was designed to work in Iceland in -30 winter to the Arabic deserts in the height of summer in 55+ degrees working hard in the sand dunes at low speeds/high loads with the air on cranked up on fully cold, getting any performance benefit over the OEM system is near impossible.
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5th Feb 2021 11:34am |
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