C63 AMG (W204) 2008 - 2015
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Coolant Cap

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Old 06-28-2023, 04:17 AM
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C63S Coupe
Coolant Cap

Hi I just noticed my coolant cap doesn't tighten on correctly - see attached. The cap itself is tight and I'm not leaking coolant but I thought the logo is supposed to be straight. Youtube videos all show it straight when tight.

I read somewhere pressure is vented from the cap so I'm a bit concerned that I have a faulty cap and it may cause a problem.

Advice is appreciated

Old 06-28-2023, 05:32 AM
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11 E550, 16 AMG GTS, 13 S550
if it's tight it's tight, the function of the vent won't matter. I mean if you want to buy a new cap it won't kill you and you could let us know

https://www.fcpeuro.com/products/mer...cap-2105010515
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Old 06-28-2023, 09:11 PM
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C63S Coupe
Thanks for your reply. I had a closer look at the cap.

There's two plastic prongs. The first, with the cap graphics straight, hits a nib but the cap is loose. When tightened, the second tab reaches that spot. I'm not sure if my cap or coolant resouvoir has a problem or if its normal. Below are pictures.


Cap is straight but loose in this position

Cap is tight in this position

Old 06-28-2023, 09:49 PM
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2014 C63 507 Coupe
Tight is the only criteria. The orientation of the cap is happenstance.

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