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C-5, factory fan settings

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Old 02-12-2018, 05:39 PM   #1
MajorMike
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Default C-5, factory fan settings

Hello,
Can anybody tell me what the FACTORY fan setting temps are for a 2004/C-5 ??
It seems to me the high comes on at 230.. but I can not find the low and high.. on and off.. factory values..
Help is appreciated..
Thanks.. MajorMike
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Old 02-12-2018, 07:39 PM   #2
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Originally Posted by MajorMike View Post
Hello,
Can anybody tell me what the FACTORY fan setting temps are for a 2004/C-5 ??
It seems to me the high comes on at 230.. but I can not find the low and high.. on and off.. factory values..
Help is appreciated..
Thanks.. MajorMike



From the factory:

WITH AC OFF

At coolant temp 226 degrees BOTH fans come ON in low speed mode. They turn OFF when the coolant temp drops to 219 degrees. If the coolant temp reaches 235 degrees then BOTH fans come ON in high speed mode. When the coolant temp drops to 226 degrees then the fans revert to low speed mode.

WITH AC ON
At coolant temp 185 degrees BOTH fans come ON in low speed mode. High speed mode occurs when the coolant temp reaches 235 degrees.

If vehicle speed exceeds 35 MPH then fans are commanded OFF irrespective of coolant temp.

The above applies to 99 - 2004 C5's. On the 97 - 98 C5's the operation is the same but actual turn on/off temps vary slightly from those above.

Last edited by 8VETTE7; 02-12-2018 at 07:41 PM.
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Old 02-13-2018, 11:51 AM   #3
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Mine seem to run pretty strong at low temps (180 or so) and seem to never shut off. Is there a sensor somewhere that I should be looking at or is that logic built in to the ECM?
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Old 02-13-2018, 02:04 PM   #4
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Mine seem to run pretty strong at low temps (180 or so) and seem to never shut off. Is there a sensor somewhere that I should be looking at or is that logic built in to the ECM?
A/C on? If you run the A/C and the car is at temp, the fans will pretty much never turn off until you're cruising.
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Old 02-13-2018, 02:06 PM   #5
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A/C on? If you run the A/C and the car is at temp, the fans will pretty much never turn off until you're cruising.
No, I get it with the AC off. I know there is an issue somewhere, but I've taken the approach, better on than off. It does need to be addressed this spring.
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Old 02-13-2018, 03:54 PM   #6
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Mine seem to run pretty strong at low temps (180 or so) and seem to never shut off. Is there a sensor somewhere that I should be looking at or is that logic built in to the ECM?

PCM controls the turn ON/OFF temps. Not uncommon for those that run colder T'stats (160 for example) to have the turn ON/OFF temps set much lower than Factory. Factory fans were not designed with the intent of running them a lot (ie long term durability) so you might want to address the issue at some time.

Turn ON/OFF temps can be programmed into the PCM. I know EFI Live and HP Tuners tuning software can set them. Not sure if any hand held tuner devices can set them. I know that the Tech II CANNOT set the fan turn ON/OFF temps. Tech II only deals with the BCM for being able to change a few things in it such as RPO's known to the BCM.
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Old 02-13-2018, 04:05 PM   #7
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PCM controls the turn ON/OFF temps. Not uncommon for those that run colder T'stats (160 for example) to have the turn ON/OFF temps set much lower than Factory. Factory fans were not designed with the intent of running them a lot (ie long term durability) so you might want to address the issue at some time.

Turn ON/OFF temps can be programmed into the PCM. I know EFI Live and HP Tuners tuning software can set them. Not sure if any hand held tuner devices can set them. I know that the Tech II CANNOT set the fan turn ON/OFF temps. Tech II only deals with the BCM for being able to change a few things in it such as RPO's known to the BCM.
As always thanks. I did a flush over the summer last year and cleaned out the radiator and condenser of all the debris that finds it's way there. I also put a new thermostat in it hoping to correct the problem, but it didn't do anything. I have a guy that has tuning equipment, so I'll have to make an appt to get it check out. Thanks again. Rob
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Old 02-14-2018, 01:21 AM   #8
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Could be that your coolant temp sensor is wrong too...
And most the aftermarket hand held tuners WILL allow for different fan settings
They do it in a roundabout way kinda... They ask what TStat temp you are running
and adjust the fans accordingly
You've def got a problem somewhere if your fans are ON at 180* and ALL your
climate controls are OFF.... I'd figure that specific issue out FIRST before you do
any aftermarket tuning
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Old 02-16-2018, 06:18 PM   #9
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Big thanks to 8vette7 for the factory settings.. turns out my local Chevy Dealer has a Vette tech guy that is pretty good.. He said he had reset the fan speeds on MANY vette's.. happy with results AND the re-learned the TPMS too.. now that works.. Also.. have many more page options on my Heads Up Display.
Tech said it just needed a couple of "Tuners" ? ( something either IN the computer or connected) not sure what those were.. but lots of things work much better now so guess it was needed... $330.00 parts and labor.
MajorMike
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Old Yesterday, 05:49 PM   #10
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Thank you 8VETTE7 you save me from purchasing a Tech II as i want to lower my cooling fans on/off setting and now i see that a Tech II can not change the fan settings , what is the best way to reset them ?

Quote:
Originally Posted by 8VETTE7 View Post
PCM controls the turn ON/OFF temps. Not uncommon for those that run colder T'stats (160 for example) to have the turn ON/OFF temps set much lower than Factory. Factory fans were not designed with the intent of running them a lot (ie long term durability) so you might want to address the issue at some time.

Turn ON/OFF temps can be programmed into the PCM. I know EFI Live and HP Tuners tuning software can set them. Not sure if any hand held tuner devices can set them. I know that the Tech II CANNOT set the fan turn ON/OFF temps. Tech II only deals with the BCM for being able to change a few things in it such as RPO's known to the BCM.
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