Low Coolant Sensor Question
 

A friend of ours has a late model E class wagon...I think it may be 2011. She texted me about getting a low coolant message. Since she was in the area I told her to stop by so I could take a look.

The reservoir seemed fairly full. But when I removed the cap I noticed that the level was just below the top of the two electrical prongs in the reservoir. Am I correct to assume that coolant needs to cover completely those two prongs in order for the sensor not to be tripped?

Thanks.

shertex, on the typical coolant expansion tank there is a "full" line. With a cold engine the coolant should be at that level.

Yes, I know. I'm asking about the sensor. I only had the opportunity to look at the coolant level when it was hot.

shertex, I am unfamiliar with the specifics of any MB vehicles after 1998. Our older E-Class vehicles have a float switch in the coolant expansion tank that initiates a warning light for low coolant level. Based on your description, I would think the coolant level needs to be above the electrical prongs to avoid the "low coolant" warning message.