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Registered
1990 420SEL, white ; 2002 VW Eurovan GLS
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105 Posts
Discussion Starter #1
there is a hose that starts just below the coolant reservoir cap and then disappears into the front passenger fender. Where does it end up?
Thanks
 

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Premium Member
1991 560 SEC 1994 E500 2014 E350 Cab
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7,029 Posts

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Registered
1990 420SEL, white ; 2002 VW Eurovan GLS
Joined
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105 Posts
Discussion Starter #4
what's the purpose of that tank? How do you access it?
Thanks
 

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Registered
1990 420SEL, white ; 2002 VW Eurovan GLS
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105 Posts
Discussion Starter #6
Thank you for the info.
I am still not sure why this car needs a reservoir for the reservoir , but they must have had an idea when they designed the car.
 

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Premium Member
07 E350, 80 240D 4 speed, 90 300SE, 87 260E
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2,823 Posts
I think the idea was that the rare, but possible, coolant overflow would disturb wealthy car owners when they saw it on the floor of their garage.

I have removed a couple fenders in junk yards and seen the overflow container. They both looked like they had seem some coolant over the decades, but not alot.
 

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Greek God of the R129
SL500-500SEL-190E
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8,373 Posts
If the car goes up mountains, hills, or over pressure, the coolant cap, will let the access pressure.
It will drain in the lower reservoir.
When it needs more coolant, it would suck it back, in to the system.

Regards,
aam.
 

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Greek God of the R129
SL500-500SEL-190E
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8,373 Posts
Yes haven't seen it in a UK car yet.
The funny thing is that on later years, they came with a new plastic screw type reservoir and black plastic screw cap.

They changed the system.
When you replace the reservoir to the new type.

You must delete/disconnect, the old drain to fender reservoir system.
Live and learn... Lol.

Regards,
aam.
 

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Outstanding Contributor
350SDL, '17 GLS450, "Grandpa's Roadster" Project Car
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3,184 Posts
It still has to have an overflow. Where does it go? (In earlier years we just dumped it on the ground...)
 

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Outstanding Contributor
350SDL, '17 GLS450, "Grandpa's Roadster" Project Car
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3,184 Posts
The overflow reservoir should be large enough to catch everything that could expand out of the pressure reservoir under normal (no blown head gasket) conditions. What I was asking about is the replacement pressure reservoir which, apparently, does not connect to the overflow reservoir, as stated previously.
 

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Greek God of the R129
SL500-500SEL-190E
Joined
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8,373 Posts
Quote:
Originally Posted by John350 View Post
The overflow reservoir should be large enough to catch everything that could expand out of the pressure reservoir under normal (no blown head gasket) conditions. What I was asking about is the replacement pressure reservoir which, apparently, does not connect to the overflow reservoir, as stated previously.


You are correct. It is large enough, for normal operation.

And yes, if over pressured it goes on the ground.
The secret is in the cap. Looks very different than the one you are familiar.

Please remember that the lower/fender reservoir is disconnected.
Or,
Removed.

The drain hose from the upper reservoir goes to the ground.
Like 50 years ago. Lol.

Regards,
aam.
 
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