Evening everyone, so I have noticed that my fan seems to run almost all the time. I don’t know if this is normal or if I could have a stuck relay or what. Does anyone else’s run pretty much like this? This is my first vett so I am new 2018 stingray 40k miles if any of that matters.

 

May be a skewed IAT or ECT sensor…if you have a scan tool these 2 data PIDS can be checked…it’s always best to let us know the model year…mileage is irrelevant.

 

Here's a description of the cooling fan and what speed is commanded. The ECM will command the highest of several requested fan speeds.

Note - the coollng fan also cools the A/C condenser, so don't be surprised if the cooling fan runs when A/C is ON.

COOLING SYSTEM DESCRIPTION AND OPERATION
Cooling Fan Control - Variable Speed Single Fan System
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan
speed by sending a pulse width modulated 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.
Cooling fan speed is effected by many different conditions and can be adjusted from 10% to 90%
duty cycle (PWM), 90% is considered high speed fan. When multiple cooling fan speed requests are
received the ECM uses the highest cooling fan speed of all the requests. The ECM commands the
cooling fan ON under the following conditions:
􀁺 Cooling fan duty cycle starts when engine coolant temperature reaches approximately 95°C
(204°F) and reaches high speed at temperatures above 113°C (235°F).
􀁺 Cooling fan duty cycle starts when A/C pressure reaches approximately 1100 kPa (160 psi) and
reaches high speed at A/C pressures above 2480 kPa (360 psi).
􀁺 At engine oil temperatures above approximately 150°C (302°F) the cooling fan duty cycle will be
commanded to high speed.
􀁺 At transmission oil temperatures above approximately 132°C (270°F) the cooling fan duty cycle
will be commanded to high speed.
􀁺 After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 113°C
(235°F) or the A/C pressure is greater than 1720 kPa (249 psi) the cooling fan duty cycle is set
to 50%, low speed. If the coolant temperature drops below 110°C (230°F) and the A/C pressure
drops below 1660 kPa (241 psi) the fan will shut OFF. The fans will automatically shut OFF after
2 min. regardless of coolant temperature.

 

Thank you for sharing this continuous fan concern on your 2018 Corvette. We're so glad to have you a part of our Chevrolet family! If you are unable to determine the source, it is best to take your Stingray to a Chevrolet dealership for further inspection. They have the expertise to help figure out a cause and perform any necessary repairs. Should you need help connecting with one in your area, feel free to email us at socialmedia@gm.com. Just be sure to include the forum title and your Username in the subject line.