coolant overflow - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 01-13-2019, 07:53 PM Thread Starter
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coolant overflow

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?
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post #2 of 14 (permalink) Old 01-13-2019, 07:57 PM
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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
That hose goes to a reserve tank under the fender well.
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post #3 of 14 (permalink) Old 01-14-2019, 06:18 AM
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That hose goes to a reserve tank under the fender well.

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post #4 of 14 (permalink) Old 01-14-2019, 09:54 AM Thread Starter
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what's the purpose of that tank? How do you access it?
Thanks
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post #5 of 14 (permalink) Old 01-14-2019, 09:59 AM
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what's the purpose of that tank? How do you access it?
Thanks
You have to remove the passenger inner fender well plastic to access the tank. It is an auxiliary overflow tank.
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post #6 of 14 (permalink) Old 01-15-2019, 02:37 PM Thread Starter
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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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post #7 of 14 (permalink) Old 01-15-2019, 06:06 PM
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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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post #8 of 14 (permalink) Old 01-15-2019, 06:29 PM
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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.

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aam.
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post #9 of 14 (permalink) Old 01-16-2019, 01:44 AM
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Yes haven't seen it in a UK car yet.

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post #10 of 14 (permalink) Old 01-16-2019, 07:00 PM
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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.

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