What is the easyest way to add a gallon ($26.00 Gallon from MB dealer) to my radiator,
I want to add it to the radiator not just into the overfolw holding tank.
Starting to approach freezeing here in seattle in the mornings, wont be long till we get a good freeze.
Is one gallon enough for my 91' 300e 3.0L.
Thanks!!!

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1991 300e 255K (14.62mpg)
1979 Corvette L82 (sold)
2000 Custom Harley Sporty 1200
(Ride Hard or Stay Home!!!).
1973 Dodge Charger 440 (sold)

The reservoir in the engine bay is not an overflow tank. It is part of the pressurized system. If you notice, there is no cap on the radiator so there's no convenient way to fill the cooling system except through the reservoir.

If there is a hose from the reservoir that disappears into the fender then perhaps there's an overflow tank behind the inner and outer fenders.

Sixto
87 300SDL

You really should drain the system and refill with the proper concentration of antifreeze rather than fudge the existing concentration. You probably don't know what the existing concentration is so throwing in a gallon could result not enough or too much of an antifreeze concentration.

Sixto
87 300SDL

Yeah, follow the above advise. Just drain the whole thing and refill with a 50/50 concentration of antifreeze and water. There are two drain plugs, one on the bottom of the radiator and one on the engine block.

If you are trying to increase the concentrion of antifreeze, is it that the car only has water in it right now?

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

un-known mixture in radiator, just purchased last summer.
looks to be just watter.

__________________
1991 300e 255K (14.62mpg)
1979 Corvette L82 (sold)
2000 Custom Harley Sporty 1200
(Ride Hard or Stay Home!!!).
1973 Dodge Charger 440 (sold)

You can get one of those little devices that measures the antifreeze concentration from an auto parts store for a few dollars. You don't want the mixture to be a lot more than 50% antifreeze because then its ability to aborb and transfer heat will be reduced. i.e. if the mixture was 100% antifreeze it would abosrb less heat from the head and not cool as much during its run in the radiator.

If you want to take a little time, your best bet would be to drain and refill the system or just test the mixture.

Cheers. -Ali

__________________
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record