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Fan stays on until battery is dead

korvettekarl

Well-known member
Joined
Nov 24, 2003
Messages
480
Location
Las Vegas, NV
Corvette
2017 Grand Sport 90 ZR1 57 Bel Air
My radiator fan is coming on and staying on until the battery is dead. Has happened 3 times now, not every time I drive it. Having to pull the negative cable off when I park it. Can't find any relay that is marked for the fans. Is this a PCM controlled function? If not where is the relay for the fans? Temp sensor bad? I am going nuts with this car. Of course just made the last payment and it has 68k on the clock. eSLD has something wrong now also. I was thinking about a .45 slug to radiator but my wife said that wouldn't be the best solution but I have my doubts. I know it would make ME feel better. Any help is greatly appreciated.
 

rheavn

Member
Joined
Oct 17, 2022
Messages
9
Location
Sioux Falls, SD
Corvette
2015 Stingray, Velocity Yellow coupe
I hope this answers your question.

"The engine cooling fan system is composed of one electric cooling fan and a cooling fan control module. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal, which enables cooling fan operation at variable speeds. The ECM will only operate the cooling fan at certain percentages to prevent undesirable noise and vibration. The cooling fan control module is thermally protected to prevent module damage in the case of a short circuit condition in the cooling fan motor"

The fan is only supposed to run at most for two minutes after engine is shut off. There may be a fuse associated with the fan circuit.
 
Last edited:

korvettekarl

Well-known member
Joined
Nov 24, 2003
Messages
480
Location
Las Vegas, NV
Corvette
2017 Grand Sport 90 ZR1 57 Bel Air
Thanks for the reply. I haven't been able to find any fuse marked fan. I hope I won't be in the market for a new ECM.
 

korvettekarl

Well-known member
Joined
Nov 24, 2003
Messages
480
Location
Las Vegas, NV
Corvette
2017 Grand Sport 90 ZR1 57 Bel Air
Wow. I will have to check this out. As he said in the video this is merely a power bus. My problem seems to be power when it is not needed. I thank you for the link. I wasn't aware of the power bus, so as they said at Faber College "knowledge is good" Thanks again.
 

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