The 2005 Chevrolet Corvette utilizes an algorithm-based low coolant level system which eliminates the need for the coolant level sensor previously positioned inside the surge tank (fig. 12).

The algorithm (a mathematical calculation) measures the difference in engine coolant temperature readings over time as a function of engine speed, to determine if the cooling system has a low coolant condition. After vehicle start-up, the ECM sends an engine RPM and engine coolant message through the BCM to the HVAC control head. The HVAC control head uses engine coolant temperature and engine RPM to determine if an increase in coolant temperature is due to a low coolant level condition.

This system is capable of losing 2 full liters of coolant before triggering the Low Coolant warning message. Because the surge tank holds approximately 0.8 liters when filled to the proper level, it's possible that a Low Coolant warning message is not triggered, even though the surge tank is completely dry.

TIP: After filling a system that has triggered the Low Coolant indicator message, the ignition must be cycled to turn the Low Coolant indicator off.

Diagnostic Tips
In the event that the Low Coolant message is present and the coolant is not low, verify that the RPM and Coolant Data (GMLAN) sent to the BCM matches the RPM and Coolant Data (Class 2) sent to the HVAC control module. If the RPM and Coolant GMLAN and Class 2 Data do match, the HVAC Module software needs updated. If the RPM and Coolant GMLAN and Class 2 Data do not match, the ECM and BCM software need updated.

TIP: This assumes that there are no RPM or Coolant codes set and no other messages or symptoms are present.

Always refer to SI for the latest service information before conducting any repairs.

I'm not all that convinced that this is such a good idea. What do you guys think?

 

I think if i look in the tank, and there is no coolant, i need to find the cause of the leak, and then add some
Who would've thought the HVAC control module is used in figuring out coolant level

 

No offense intended, but the moderators have been locking or moving threads posted in the wrong forum when found. As this is apparently about the C6 coolant system, it would be more appropriate for one of the C6 forums than here in C5 General:

C6 Corvette General Discussion

C6 Tech/Performance

Thanks for the info though.

 

 

I guess this eliminates the need for a sensor, but I hope it reads things correctly.

 

Fascinating...

 

IB4TL!

 

It's amazing the high tech crap they can devise with computers...

Maybe they should start focusing on a fuel gauge system that can be as reliable as say a car built in 1960.