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Old 09-13-2002, 10:17 PM
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'90 420 SEL Coolant low..

The coolant light on my 1990 420 SEL has been coming on every so often early in the morning for about 5 minutes, then it goes off. I'm assuming my coolant level is low. Can I just top the resivour off or do I have to flush it?
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Old 09-13-2002, 10:50 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
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You can just add some if you want. The coolant is supposed to be replaced every 3 years though.
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Old 09-14-2002, 10:11 AM
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tkamiya if you could post how to do that i would be very thankful.
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Old 09-14-2002, 11:24 AM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
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I recommend putting water in too! Equal amts of coolant AND water.

2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 09-14-2002, 04:41 PM
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Location: Evansville WI
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I never thought about a bad sensor. Possible I suppose, but since it happens on cold start-up only, then goes out, this sounds like a classic slightly low coolant problem. As the car warms up, the coolant expands into the tank and then the level is fine.

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