Coolant Top Up Warning
MBWorld Fanatic!
Joined: Jul 2003
Posts: 2,123
Likes: 3
From: Chicago, IL
Real Cars
Correct... telling you to top up your coolant would be a result of the coolant level sensor reporting to the ECU that you are low on coolant... if you are saying you are not... it's possible the sensor is going bad... or it's as shardul said... you could be a little low on coolant because there is a leak or it's getting into your trans - a known problem on the '03/'04s
-m
-m
Super Member
Joined: Nov 2004
Posts: 992
Likes: 11
From: Illinois
GL550, C55, 335i Coupe, vintage Mustang
Just a little tidbit of information for you. The coolant level switch and washer fluid level switch are wired in series to the drivers front fuse box. The yellow/grey wire comes to the coolant switch from the fuse box. The brown wire on the coolant level switch goes directly to the washer tank, and the blue wire from the washer switch goes to the fuse box. I have seen on several occasions that the washer level switch has developed a small leak in the casing, corroding the connector, and not triggering a washer light, but a low coolant light. Good luck.
Nick
Nick
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MBWorld Fanatic!
Joined: Jul 2008
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From: Philly
997TT, C192 GT63, W464 G550, MS Plaid
Correct... telling you to top up your coolant would be a result of the coolant level sensor reporting to the ECU that you are low on coolant... if you are saying you are not... it's possible the sensor is going bad... or it's as shardul said... you could be a little low on coolant because there is a leak or it's getting into your trans - a known problem on the '03/'04s
-m
-m
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From: Houston
2003 W211 E55, 2003 W220 S600
Just a little tidbit of information for you. The coolant level switch and washer fluid level switch are wired in series to the drivers front fuse box. The yellow/grey wire comes to the coolant switch from the fuse box. The brown wire on the coolant level switch goes directly to the washer tank, and the blue wire from the washer switch goes to the fuse box. I have seen on several occasions that the washer level switch has developed a small leak in the casing, corroding the connector, and not triggering a washer light, but a low coolant light. Good luck.
Nick
Nick
