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1990 300 SE
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42 Posts
Discussion Starter · #1 ·
Hey guys, I am embarrased to even ask this question but my light went off today, and i would like to add some coolant. The problem is that I know nothing about cars. I don't know where to put it. Also, is this antifreeze or is that something different. Man am I pathetic or what? [:D]
 

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1991 300 SE
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18,534 Posts
Assuming you have no leaks the low coolant light is actually a de facto change coolant light. If it’s been more than two years since you’ve had the coolant flushed and refilled, it is time to do it now. That enough water has evaporated and vented out to the point where the low coolant light is on, it has been in there for a while.

In the mean time just add water to the plastic expansion tank located on the LHD passenger wheel well, it will have a metal pressure cap on top and a coolant line running to the bottom of the radiator. Add enough water for the dash light to go off, no more.

I’d recommend taking the car to a good MB indy for the cooling system flush/refill.

Antifreeze and coolant are the same thing – where I live its ‘coolant.’

Post in the w126 forum from now on.
 

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1990 300 SE
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42 Posts
Discussion Starter · #3 ·
thanks for the response. I apologize if this is in the incorrect forum, I wasn't sure where to put it. When I bring it in, what should I ask for? How much should it cost? Also, I should just add water and not antifreeze? Should it be distilled water or does it matter?
 

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1991 300 SE
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18,534 Posts
As I do things like this myself I really have no idea how much it would cost, I would think less than $100 if that much. Since you’re replacing the coolant adding more would be a waste of money; you also need to use MB coolant. Use tap water for now, it will keep the engine cool and not harm anything until you get it to a shop. Just ask for cooling system service which should include a flush, pressure and leak test, and a refill of the proper coolant at the correct mix.

Your 300 SE is a 126 chassis car, posting in that forum will get you more responses as that is where other 126 owners post and read.
 
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