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Old 07-03-2003, 12:24 PM
Registered User
Join Date: Apr 2002
Location: Portland Oregon, USA
Posts: 65
Help! 300e coolant light comes on in morning?

Hello all,

my 92 300e (2.6) has been doing an odd symptom as of recently- it appears that the amber "low coolant" indicator (I think thats what it is- has an icon of a radiator on it) has been coming on every other day, seemingly only after my car has sat overnight , only during the first 15-45 seconds of driving... Yet, I freak out and go check the resevoir, and it has plenty of coolant present... could this be a sensor issue of some sort? (is there a coolant level sensor?)
Odd, that it doesnt happen every day, just every _other day_ or so.. and only during the first minute or so of driving the car. The rest of the day, the light will never come on. Weird!

Any suggestions?

Thanks so much for any and all of your help!

92 300e 2.6 126k
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Old 07-03-2003, 12:53 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,315
At least on my '86, there is a sensor - you can see it on the side. Might be worth futzing with it.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 07-03-2003, 01:51 PM
G-Benz's Avatar
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
It's a known issue here that the sensor is prone to false signals when the contacts are corroded or dirty.

Disconnect the plug from the coolant level sensor (should be on the lower right side of the coolant tank), and clean the contacts (both male and female).

See if that doesn't solve the problem...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car
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Old 07-03-2003, 02:05 PM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
New sensor 124-540-02-44 new contact 003-545-26-26 x2 new pin housing 001-545-71-28 replace it all .
MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner
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