Low coolant warning - sensor ok
Thread Starter
MBWorld Fanatic!
Joined: Aug 2013
Posts: 1,364
Likes: 149
2012 C300 4MATIC Sport
Low coolant warning - sensor ok
Hello,
After finding and fixing the coolant leaking into the oil problem, the car is now displaying a low coolant warning even though the coolant is topped off in both the expansion tank/reservoir and the washer fluid reservoir is full.
The warning disappears once the sensor is removed from the reservoir while still being connected. We tried another sensor and the same thing happened. Inside the coolant reservoir = warning, outside it = no warning. As if there's something inside the coolant reservoir causing this. Mind you the coolant reservoir is a year old at most. My mechanic is saying that I need to replace the reservoir even though it's not old.
Are there any WIS documents to diagnose this? How does the sensor function? Can I remove the reservoir and inspect it/fix it in a way rather than buy a new one?
Thank you.
After finding and fixing the coolant leaking into the oil problem, the car is now displaying a low coolant warning even though the coolant is topped off in both the expansion tank/reservoir and the washer fluid reservoir is full.
The warning disappears once the sensor is removed from the reservoir while still being connected. We tried another sensor and the same thing happened. Inside the coolant reservoir = warning, outside it = no warning. As if there's something inside the coolant reservoir causing this. Mind you the coolant reservoir is a year old at most. My mechanic is saying that I need to replace the reservoir even though it's not old.
Are there any WIS documents to diagnose this? How does the sensor function? Can I remove the reservoir and inspect it/fix it in a way rather than buy a new one?
Thank you.
Newbie
Joined: Jul 2019
Posts: 6
Likes: 0
2005 E55
Hello,
After finding and fixing the coolant leaking into the oil problem, the car is now displaying a low coolant warning even though the coolant is topped off in both the expansion tank/reservoir and the washer fluid reservoir is full.
The warning disappears once the sensor is removed from the reservoir while still being connected. We tried another sensor and the same thing happened. Inside the coolant reservoir = warning, outside it = no warning. As if there's something inside the coolant reservoir causing this. Mind you the coolant reservoir is a year old at most. My mechanic is saying that I need to replace the reservoir even though it's not old.
Are there any WIS documents to diagnose this? How does the sensor function? Can I remove the reservoir and inspect it/fix it in a way rather than buy a new one?
Thank you.
After finding and fixing the coolant leaking into the oil problem, the car is now displaying a low coolant warning even though the coolant is topped off in both the expansion tank/reservoir and the washer fluid reservoir is full.
The warning disappears once the sensor is removed from the reservoir while still being connected. We tried another sensor and the same thing happened. Inside the coolant reservoir = warning, outside it = no warning. As if there's something inside the coolant reservoir causing this. Mind you the coolant reservoir is a year old at most. My mechanic is saying that I need to replace the reservoir even though it's not old.
Are there any WIS documents to diagnose this? How does the sensor function? Can I remove the reservoir and inspect it/fix it in a way rather than buy a new one?
Thank you.
I know it’s old. But since nobody offered to help, I’d like to know how you fixed this.
Otherwise I’ll start ANOTHER thread ! Oh nooo
