sigp320

I have an 08 base. A "Low Coolant" message has appeared. Upon trying to add coolant, it was full. The cooling fan does run often. What am I doing wrong?

Eritosthenes

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.

jonjoy

My 06 used to do that all the time, the alarm is exceeding the time out function in the computer my tuner fixed it, you could probably fix it with a tech 2.

C6ToGo

The shop manual states that if you get the message and not low on coolant that you need to reprogram the HVAC control module.

sigp320

Thanks

RJS91RGTP

The issue is probably the sensor going bad. Pull the code and you will get the answer to the question but most likely the sensor.

sigp320

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...

C6ToGo

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.

Cherokee Nation

HI Tex: Where is the HVAC module located at?.....Thanks

owc6

Yep, there is no "sensor," but it can read conditions pretty accurately to determine if the coolant level is adequate. And warn you if you have ventured into dangerous territory.