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  #1  
Old 09-13-2002, 11:17 PM
da0618
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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, 11:50 PM
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You can just add some if you want. The coolant is supposed to be replaced every 3 years though.
Gilly
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Old 09-14-2002, 11:11 AM
da0618
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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, 12:24 PM
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I recommend putting water in too! Equal amts of coolant AND water.

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Old 09-14-2002, 05:41 PM
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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.

Gilly
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