Engine Fan??
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Senior User
Joined: Sep 2008
Posts: 476
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From: Jasper, tx
Engine Fan??
I know with the factory fan cluch there are a lot of variables for the fan to
come on. Does anyone know at what temps Coolant/oil/ trans that would
make the fan come on?? Or does anyone have the wiring diagram of where to look to see if it is unplugged?? Thanks ahead for any input!!!
come on. Does anyone know at what temps Coolant/oil/ trans that would
make the fan come on?? Or does anyone have the wiring diagram of where to look to see if it is unplugged?? Thanks ahead for any input!!!
Hotshot
Joined: Jun 2006
Posts: 15,447
Likes: 3
From: Hampstead, NC
Well it's variable. Locks in at 100% at about 218 ECT IIRC. Somewhere near there.
It plugs in on the drivers side of the engine, right at the stator assembly. The wiring to the fan is tough to see with the stator and fan shroud in there...
It plugs in on the drivers side of the engine, right at the stator assembly. The wiring to the fan is tough to see with the stator and fan shroud in there...
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
This is from the tech folder (thanks Bismic!)
Some say fan kicks on at 210, some say 215, others say 220. Full explanation: Engine temperature is not the only parameter that the PCM monitors to determine cooling fan operation. This is the reason that you will see some variation in engine temperature as it correlates to fan operation. The operation/description of the FSS (Fan Speed Sensor) from the PC/ED manual has a fairly good explanation as to how the system "thinks". This is not your traditional engine hits temp X and the fan clutch locks up. The fan speed sensor is a Hall-Effect sensor integral to the vistronic drive fan (VDF). The powertrain control module (PCM) will monitor sensor inputs and control the VDF speed based upon engine coolant temperature (ECT), transmission fluid temperature (TFT) and intake air temperature (IAT) requirements. When an increase in fan speed for vehicle cooling is requested, the PCM will monitor the FSS signal and output the required pulse width modulated (PWM) signal to a fluid port valve within the VDF. Engine begins to defuel at 221 deg. The thermostat begins to open at about 190*F to 195*F and is not fully open until about 215*F to 219*F..
Some say fan kicks on at 210, some say 215, others say 220. Full explanation: Engine temperature is not the only parameter that the PCM monitors to determine cooling fan operation. This is the reason that you will see some variation in engine temperature as it correlates to fan operation. The operation/description of the FSS (Fan Speed Sensor) from the PC/ED manual has a fairly good explanation as to how the system "thinks". This is not your traditional engine hits temp X and the fan clutch locks up. The fan speed sensor is a Hall-Effect sensor integral to the vistronic drive fan (VDF). The powertrain control module (PCM) will monitor sensor inputs and control the VDF speed based upon engine coolant temperature (ECT), transmission fluid temperature (TFT) and intake air temperature (IAT) requirements. When an increase in fan speed for vehicle cooling is requested, the PCM will monitor the FSS signal and output the required pulse width modulated (PWM) signal to a fluid port valve within the VDF. Engine begins to defuel at 221 deg. The thermostat begins to open at about 190*F to 195*F and is not fully open until about 215*F to 219*F..
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
There is a plug just outside of the shroud on top just in front of the upper fuel filter. Check inside the shroud below that connector if you think you may have a broken wire. Fan sometimes likes to chew on it if it's not properly secured.
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
I know with the factory fan cluch there are a lot of variables for the fan to
come on. Does anyone know at what temps Coolant/oil/ trans that would
make the fan come on?? Or does anyone have the wiring diagram of where to look to see if it is unplugged?? Thanks ahead for any input!!!
come on. Does anyone know at what temps Coolant/oil/ trans that would
make the fan come on?? Or does anyone have the wiring diagram of where to look to see if it is unplugged?? Thanks ahead for any input!!!
Well you can program the SGII for Fan RPM and watch what its doing
FSS Fan Speed Sensor (RPM) TXD: 07E022099F RXF: 04620509069F RXD: 3010 MTH: 000100040000 NAM: FSS
Like David Says it comes on at 218* but Mine only hits 1500RPM then and IIRC it hits upto 3000RPM IIRC not 100% shure on this MAX speed thing though
If your fan was unplugged the truck wouldnt start is that your problem or?????
Fan speed is controlled by
Speed
Ambeint temp
ECT
A/C compressor On
things like that you would have to watch it for a Few to get a Feel for it
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
so you can hear fan howel all the time?????????
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Fleet Owner
Joined: Nov 2003
Posts: 27,872
Likes: 3,592
Well you can program the SGII for Fan RPM and watch what its doing
FSS Fan Speed Sensor (RPM) TXD: 07E022099F RXF: 04620509069F RXD: 3010 MTH: 000100040000 NAM: FSS
Like David Says it comes on at 218* but Mine only hits 1500RPM then and IIRC it hits upto 3000RPM IIRC not 100% shure on this MAX speed thing though
If your fan was unplugged the truck wouldnt start is that your problem or?????
Fan speed is controlled by
Speed
Ambeint temp
ECT
A/C compressor On
things like that you would have to watch it for a Few to get a Feel for it
FSS Fan Speed Sensor (RPM) TXD: 07E022099F RXF: 04620509069F RXD: 3010 MTH: 000100040000 NAM: FSS
Like David Says it comes on at 218* but Mine only hits 1500RPM then and IIRC it hits upto 3000RPM IIRC not 100% shure on this MAX speed thing though
If your fan was unplugged the truck wouldnt start is that your problem or?????
Fan speed is controlled by
Speed
Ambeint temp
ECT
A/C compressor On
things like that you would have to watch it for a Few to get a Feel for it
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Postmaster
Joined: Jul 2011
Posts: 3,263
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From: Houston, TX
if ur fan howls all the time, it may be something else that is causing it to come on and stay on all the time. not to sounds paranoid, but maybe something within the entire cooling system is going out, and the car's temp sensor is not detecting stuff tat are being cooled properly, and so it keeps the fan going constantly to keep the entire engine cooled.
maybe ur engine system is throwing up more heat than normal, which would again suggest something is not being cooled properly, and something may be going out or something has already gone out. i'd look into that so as to be able to catch the problem early.
maybe ur engine system is throwing up more heat than normal, which would again suggest something is not being cooled properly, and something may be going out or something has already gone out. i'd look into that so as to be able to catch the problem early.
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Some of these temps are just what I noticed with my truck not from manual.
The FAN has several trigger points all of which is a SET Number. IMO they Have to be certain set temps to make it work to step the fan rpm up
I mention 218* ECT cause Most trucks will engauge the FAN by/at this point. I have heard anything from 210*-215*-218* ECT at this point the fan will usually kick upto 1500+RPM. Trigger points are slightly diff year to year or really what Stratigy the PCM is using.
another example would be like 95* Ambeint temp A/C on and stoped at a traffic light would kick my fan rpm upto 800+rpm again just what I noticed with my personal truck
Fleet Owner
Joined: Nov 2003
Posts: 27,872
Likes: 3,592
I believe what Rusty posted is correct. The PCM looks at a variety of parameters to operate the fan - not any single set temperature, and sends a duty cycle comand to the clutch. Not sure why you say there has to be set temperatures. Do you have a copy of the PC/ED manual? It has been awhile since I looked it over.
Senior User
Joined: Dec 2010
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When I start the truck in the morning, delta is 2*. Let it warm up for a bit and start driving, coolant temp rises faster. Both stay within 15* coolant levels off at 192, oil about 5 to 7* warmer once it gets there. But fan is always on. No EGR to worry about either.
Logistics Pro
Joined: Mar 2007
Posts: 4,604
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From: Claremore, OK
Your saying after a cold soak (12+ hours) your still seeing a 2F delta between EOT and ECT? Sounds like you've got a bum sensor. They should be the same after stilling that long.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Hey Crash, can you describe what you mean by "fan is on"? Not trying to be a smart*** but I've never seen mine off with truck running. Have you ever heard it kick in to high gear, maybe pullin a load up a hill on a hot day? It sounds like someone's trying to pass. Is it like that? Or maybe a medium speed?
Senior User
Joined: Dec 2010
Posts: 310
Likes: 0
Hey Crash, can you describe what you mean by "fan is on"? Not trying to be a smart*** but I've never seen mine off with truck running. Have you ever heard it kick in to high gear, maybe pullin a load up a hill on a hot day? It sounds like someone's trying to pass. Is it like that? Or maybe a medium speed?