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#1 | ||
FF.Com.Au Hardcore
Join Date: Apr 2006
Location: Adealide, SA
Posts: 1,354
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Hi guys,
I am interested in finding out how the twin thermo fans work in our AUs. I know that when the air con is on that both fans run automatically. Am I correct in saying that they are variable speed also? What I would like to know is when does the first one activate? When does the second one activate also or is it only when air con is used? Any info would be great! |
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#2 | ||
Au Falcon = Mr Reliable
Join Date: Sep 2009
Location: North West Slopes & Plains NSW
Posts: 4,076
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80c then 110c iirc? You can put the dash in diag mode & check, if the a/c capillary tube is blocked low speed fan will come on earlier too apparently. Good luck!
cheer's, Maka
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Ford AU Series Magazine Scans Here - www.fordforums.com.au/photos/index.php?cat=2792 Proud owner of a optioned keeper S1 Tickford Falcon AU XR6 VCT - "it's actually a better-balanced car than the XR8, goes almost as hard and uses about two-thirds of the fuel" (Drive.com 2007) |
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#3 | ||
5.6L x 2 pilot
![]() ![]() Join Date: Dec 2009
Location: Canbra
Posts: 14,975
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Hi XF.
I cannot confirm with a 6 cyl, but reading the stock V8 tune, it is based around an 198 DegF (92 DegC) Thermostat. Low fan speed kicks in at 210 DegF (98.9 DegC) and High fan kicks in at 224 DegF (107 DegC). It would be fairly safe to assume the I6 is close or similar. My understanding is that one fan kicks in at the low value and the second fan kicks in at the high value. I do not believe that they are variable speed - I have not seen any hardware or tune config to confirm they are variable. Cheers Stu
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2002 AU II LTD 5.6L 342ci T3 Short, AFR165 heads, Comp XE270HR-12 Cam, Brembo 4/4s(355/330), T3 5 spokes, LC-1 wideband, Whiteline HD swaybars, TCE 3K Hi Stall, PWR Auto Trans Cooler, Koni shocks, King Low Springs, Hurricane headers, 100 cpsi cats, Twin 2.5" exhaust. Quarter Mile: 13.73 @ 105.86mph Runner Up NA/DA to BF Fairlane/LTD Geelong AFD 2024 ![]() 2002 XR8 pursuit 250 Custom twin 2.5" exhaust w Herrod modifed extractors, Tuned with Moates QH
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#4 | ||
FF.Com.Au Hardcore
Join Date: Apr 2006
Location: Adealide, SA
Posts: 1,354
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Ok that's helpful guys. It is concerning a track car that will have no air con. I was just concerned that the second fan was only associated with air con. As long as it will come on at high temp then that's fine.
Thanks! |
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#5 | |||
Miami Pilot
![]() Join Date: Jan 2005
Location: ACT
Posts: 21,701
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Quote:
With AC on, both fans run on low speed. This speed is achieved by running the fans in series, so the 12V is split between them, meaning 6V each, which only powers the fans to turn at roughly half their max. When the temp sensor hits the figure required (as per Stu's figures above), both fans kick into high speed mode; this is achieved by switching the circuit to run the fans in parallel, meaning that each fan gets a full 12V resulting in the fan running at max speed. I run AU fans in our explorer, and this was how I originally had them setup based on the research I did to find out how to make them low/high speed. if you ran one fan at high speed, the sound would be quite loud even just for one fan, but at low speed wired in series, they are barely audible - I have to put my hand behind them to feel that they are working. The setup I now run with the AU fans in the explorer is the low speed fans run whenever the car is on (engine on), a supplementary 10" Davies craig fan fitted to the back of the AC condensor comes on when the AC is on (and then blows air onto the front of the radiator), and the AU fans come on high when the temp sensor hits around 82*.
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb) 1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs). Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings FPV 335 build stats: <click here> Ford Performance Club ACT |
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#6 | |||
Miami Pilot
![]() Join Date: Jan 2005
Location: ACT
Posts: 21,701
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Quote:
Wiring diagram attached:
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb) 1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs). Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings FPV 335 build stats: <click here> Ford Performance Club ACT Last edited by JC; 18-02-2016 at 03:24 PM. |
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#7 | ||
FF.Com.Au Hardcore
Join Date: Apr 2006
Location: Adealide, SA
Posts: 1,354
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Great info. Thank you. Coming on in stages is great, when I have the J3 chip done I will get them to drop the switch on point for the high speed and leave the rest alone I think.
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#8 | ||
Au Falcon = Mr Reliable
Join Date: Sep 2009
Location: North West Slopes & Plains NSW
Posts: 4,076
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A bit more info (aufanboy post from au2 wagon overheating) -
http://fordforums.com.au/showthread....on+thermo+fans Hey, The sensor is connected to the ECU, which then sends the temperature info (along with other stuff) to the dash cluster via a serial data connection. So if your temp gauge is working then the sensor must be working. The fans should come on low speed when the gauge reaches the last mark before the N (of Normal). They should then switch into high speed mode (jet taking off) at about 105 degrees, which on an AUII will be just between N and O (the gauge is faked somewhat and sits in the same spot from 92 to 110ish). I would replace all three relays and start the car and check for low and high speed fan operation. Here's the schematic from the manual: http://www.fordwrm.co.za/manuals/For...on_auII664.pdf and http://www.fordwrm.co.za/manuals/For...on_auII665.pdf cheer's, Maka
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Ford AU Series Magazine Scans Here - www.fordforums.com.au/photos/index.php?cat=2792 Proud owner of a optioned keeper S1 Tickford Falcon AU XR6 VCT - "it's actually a better-balanced car than the XR8, goes almost as hard and uses about two-thirds of the fuel" (Drive.com 2007) |
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#9 | ||
Starter Motor
Join Date: Feb 2014
Posts: 4
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Can anyone tell me why my au series 2 one tonner overheats only when I put on the
air-con? Driving without the air-con on no problems,not one drop of fluid losses,but when I turn the air-con on I lose most of the coolant |
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#10 | |||
XR6T BA 2002
Join Date: Apr 2011
Posts: 681
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Quote:
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XR6T 2002 BA
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#11 | ||
Au Falcon = Mr Reliable
Join Date: Sep 2009
Location: North West Slopes & Plains NSW
Posts: 4,076
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Hi NCII4.0, not sure why the temp gauge is faked, have heard of au dash's giving false temp readings & boiling too unfortunately. Maybe the sensor is two stage not variable idk.
cheer's, Maka
__________________
Ford AU Series Magazine Scans Here - www.fordforums.com.au/photos/index.php?cat=2792 Proud owner of a optioned keeper S1 Tickford Falcon AU XR6 VCT - "it's actually a better-balanced car than the XR8, goes almost as hard and uses about two-thirds of the fuel" (Drive.com 2007) |
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#12 | |||
XR6T BA 2002
Join Date: Apr 2011
Posts: 681
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Quote:
I am looking at changing the sender over to make it variable Hoping an E series sender will work
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XR6T 2002 BA
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#13 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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Mine sits at completely different spots for temps around 190f in comparison to the 210's gauge works perfectly fine in mine wouldn't say it's dummy gauge for looks
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Current Car: 2002 AUII LTD 408ci Windsor, T6 S488, TH400, 2 Piece Shaft, Helicial LSD 3.23 IRS Daily: 1998 Mitsubishi Super VR-4 Legnum |
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