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Photos - ?melted C-class bumper
notmeatloaf
post Thu, 26 Jul 2018 - 16:58
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Quick query because I've never seen anything like it before.

I have an 18 C-class Merc. I noticed today that there is a hole in the bumper.

At first I thought I must have bashed it but looking closer there is nothing structural behind it to make the hole, and no marks other than the cracked paint around the hole itself. Plus, the whole section of bumper seems to have warped - the inspection hole cover no longer fits in place.

I will take it to MB tomorrow prepared to be told I should have applied MB sun lotion, or only park it at night. I was wondering if anyone had seen similar? I will be cheesed off if I have to pay for it because you expect to be able to park a car on sunny days without holes appearing!



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post Thu, 26 Jul 2018 - 16:58
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StuartBu
post Thu, 26 Jul 2018 - 17:15
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From these images I am struggling to see how heat from the Sun could have caused that .
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The Rookie
post Thu, 26 Jul 2018 - 17:32
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Looks like exhaust heating coming up behind the bumper. I’ve seen similar on cars coming off rolling roads (no airflow).


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notmeatloaf
post Thu, 26 Jul 2018 - 17:54
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Good idea on the exhaust. I hadn't really thought before but the exhaust is all contained somehow. Having looked into it a bit more the end of the hole in the bumper is at the end of some thick beam about 1.5" behind the bumper which feels greasy. I wonder if that has been heating up and the end of the beam is what has caused the hole.

I don't really drive the car hard (or as hard as it is designed to be at any rate) and use the stop/start thing, although obviously with the weather have been idling more than normal with the air con. Makes sense, I really couldn't work out anything that would focus the sun in the work car park!

This post has been edited by notmeatloaf: Thu, 26 Jul 2018 - 17:55
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Fredd
post Thu, 26 Jul 2018 - 21:56
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Isn't that the tow point cover?


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notmeatloaf
post Thu, 26 Jul 2018 - 22:39
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QUOTE (Fredd @ Thu, 26 Jul 2018 - 22:56) *
Isn't that the tow point cover?

I don't think so, all there is behind it is the impact bar, with a hole drilled to allow access to something behind it.

But with the modern trend to put a plastic cover over every part you conceivably need in an emergency, who knows.
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typefish
post Thu, 26 Jul 2018 - 23:07
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QUOTE (notmeatloaf @ Thu, 26 Jul 2018 - 23:39) *
QUOTE (Fredd @ Thu, 26 Jul 2018 - 22:56) *
Isn't that the tow point cover?

I don't think so, all there is behind it is the impact bar, with a hole drilled to allow access to something behind it.


A towing eye is screwed into this hole.

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The Rookie
post Fri, 27 Jul 2018 - 07:45
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QUOTE (Fredd @ Thu, 26 Jul 2018 - 22:56) *
Isn't that the tow point cover?

The tow point cover is close to the damage, but its not damaged itself.

NTML, RTFM... the towing eye similar to that pictured screws into the hole behind the cover to create a tow point.
http://www.mersuv.com/mbread-421.html


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Lodesman
post Fri, 27 Jul 2018 - 08:13
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While the temperatures we have been experiencing have been unusually high, they are certainly not exceptional when you consider other markets where MB sell their cars.

For example the US (Texas for instance),UAE, Saudi Arabia, not to mention the south of France, Spain and southern Italy etc. I doubt that many manufacturers would alter the construction of plastic components of similar models to take account of the weather conditions in the customer areas unless these conditions were very extreme and a week or two in the UK at a maximum ambient of 30-35C hardly constitutes extreme weather when considered against many other places worldwide.

Could it be a very unlucky bump on the plastic cover sustained in the supermarket grand prix where the bumper was deformed sufficiently to contact the metal behind it before returning to its original position ?

This post has been edited by Lodesman: Fri, 27 Jul 2018 - 08:29
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peodude
post Fri, 27 Jul 2018 - 08:14
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That looks like it could be suns focused rays, like through a magnifying glass. I believe the Walkie Talkie in London was one such incident of the suns rays focussing and damaging cars.
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The Rookie
post Fri, 27 Jul 2018 - 11:36
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The 'Shard' also damaged cars plastics with focused reflections.

The 'walkie talkie'
https://nationalpost.com/news/london-skyscr...so-cooking-eggs


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jdh
post Fri, 27 Jul 2018 - 12:27
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My guess would be an unfortunate sequence of events involving the sun and a possibly curved reflective surface, even something like a lightly tinted window could focus quite a beam in this weather.
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glasgow_bhoy
post Fri, 3 Aug 2018 - 09:43
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I'd have guessed someone has bumped into the back of that- have you taken the bumper off to see whats behind it?
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peterguk
post Fri, 3 Aug 2018 - 10:06
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QUOTE (glasgow_bhoy @ Fri, 3 Aug 2018 - 10:43) *
I'd have guessed someone has bumped into the back of that


Too obvious. And takes the fun out of guessing. laugh.gif


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notmeatloaf
post Fri, 3 Aug 2018 - 12:43
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There are no marks on the paintwork and when
I have seen bumps in the past even when cracked you can push them back together. It's difficult to see how both could happen
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