Low Coolant message
Melting Slicks
Joined: Aug 2006
Posts: 2,409
Likes: 129
From: Fairview Heights IL
Do you have a leak, or other explanation for the Low Coolant message? The C6 cooling system should be tight and not lose a drop. If there's a problem, correcting it is a must.
Most shops use a coolant recovery rig that essentially sucks the system dry. The resulting near vacuum allows new coolant (Dexron) to completely fill all lines and spaces with no voids to burp. It's fast and sure.
Most shops use a coolant recovery rig that essentially sucks the system dry. The resulting near vacuum allows new coolant (Dexron) to completely fill all lines and spaces with no voids to burp. It's fast and sure.
Thread Starter
Heel & Toe
Joined: Jul 2019
Posts: 21
Likes: 12
You might be right. I put less than a half pint coolant in that filled it. I later drove it about 60 miles with no messages and the temp. below 200. The cooling fan does seem to run more than I would expect. However, it has always done that. I've owned it for 5 years and it has been mostly problem free. Thanks again...
Safety Car
Joined: Dec 2006
Posts: 4,582
Likes: 1,661
From: Pearland / Houston Tx
Low Coolant Message
The engine cooling system utilizes an algorithm based low coolant level system which eliminates the need for the coolant level sensor previously positioned inside the surge tank. The algorithm 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 engine control module (ECM) sends an engine RPM and engine coolant temperature message through the body control module (BCM) to the HVAC control module. The HVAC control module uses engine coolant temperature and engine RPM to determine if an increase in engine 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 indicator. Because the surge tank holds approximately 0.8 liters when filled to the proper level, its possible that the Low Coolant indicator will not be triggered, even though the surge tank is completely dry.
That is why my advice was to check the HVAC module and not a level sensor.
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Le Mans Master
Joined: Jan 2008
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From: corpus christi Texas
Team Owner
Joined: Apr 2013
Posts: 26,227
Likes: 4,352
From: Chirper Island
If you are driving yourself crazy trying to find your Coolant Level Sensor, read this:
Low Coolant Message
The engine cooling system utilizes an algorithm based low coolant level system which eliminates the need for the coolant level sensor previously positioned inside the surge tank. The algorithm 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 engine control module (ECM) sends an engine RPM and engine coolant temperature message through the body control module (BCM) to the HVAC control module. The HVAC control module uses engine coolant temperature and engine RPM to determine if an increase in engine 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 indicator. Because the surge tank holds approximately 0.8 liters when filled to the proper level, its possible that the Low Coolant indicator will not be triggered, even though the surge tank is completely dry.
That is why my advice was to check the HVAC module and not a level sensor.
Low Coolant Message
The engine cooling system utilizes an algorithm based low coolant level system which eliminates the need for the coolant level sensor previously positioned inside the surge tank. The algorithm 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 engine control module (ECM) sends an engine RPM and engine coolant temperature message through the body control module (BCM) to the HVAC control module. The HVAC control module uses engine coolant temperature and engine RPM to determine if an increase in engine 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 indicator. Because the surge tank holds approximately 0.8 liters when filled to the proper level, its possible that the Low Coolant indicator will not be triggered, even though the surge tank is completely dry.
That is why my advice was to check the HVAC module and not a level sensor.