Suspicious marks on new evaporator (normal or defect?)
Thread Starter
Member
Joined: Dec 2020
Posts: 163
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From: A small city
2010 W212 E350
Suspicious marks on new evaporator (normal or defect?)
To start my evaporator replacement project, I have bought a new evaporator from a local dealer shop, but found that some spots (or marks) on the surface of the evaporator. The dealer shop told me that it should be some "welding points" and the evap are good to use.
However, I suspect these are rushing that will easily cause leaking after installation.
Any one have similar experience to share or any advice will be greatly helpful for me.
Thanks.
The model of the evap
However, I suspect these are rushing that will easily cause leaking after installation.
Any one have similar experience to share or any advice will be greatly helpful for me.
Thanks.
The model of the evap
MBWorld Fanatic!
Joined: May 2018
Posts: 6,600
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Evap is made of aluminum as fas as I know, you can test with magnet.
That rusy dirt could be rust tranfer from other steel object.
Aluminum "rust"/corossion or oxidation is whitish ALU Oxide.
https://www.allmetalsfab.com/does-aluminum-rust/
Rust transfer to ALU. The plate is alu, the bolt and nut is proabaly 304SS which will rust
If you can clean them small rusty spots and they look spotless after cleaning, I would say no worry.
This is a used EVAP, it seems to have similar lines like yours, but too bad I can't zoom in too well
https://www.ebay.com/itm/375154311527
.
This used one seems to be clean
https://www.ebay.com/itm/39615573363...3ABFBM1rn51Nll
.At close up detail, your evap rusty spots do look offensive and could be eating the ALU underneath it
That rusy dirt could be rust tranfer from other steel object.
Aluminum "rust"/corossion or oxidation is whitish ALU Oxide.
https://www.allmetalsfab.com/does-aluminum-rust/
Rust transfer to ALU. The plate is alu, the bolt and nut is proabaly 304SS which will rust
If you can clean them small rusty spots and they look spotless after cleaning, I would say no worry.
This is a used EVAP, it seems to have similar lines like yours, but too bad I can't zoom in too well
https://www.ebay.com/itm/375154311527
.
This used one seems to be clean
https://www.ebay.com/itm/39615573363...3ABFBM1rn51Nll
.At close up detail, your evap rusty spots do look offensive and could be eating the ALU underneath it
Last edited by S-Prihadi; May 14, 2025 at 01:44 AM.
Thread Starter
Member
Joined: Dec 2020
Posts: 163
Likes: 54
From: A small city
2010 W212 E350
Evap is made of aluminum as fas as I know, you can test with magnet.
That rusy dirt could be rust tranfer from other steel object.
Aluminum "rust"/corossion or oxidation is whitish ALU Oxide.
https://www.allmetalsfab.com/does-aluminum-rust/
Rust transfer to ALU. The plate is alu, the bolt and nut is proabaly 304SS which will rust
If you can clean them small rusty spots and they look spotless after cleaning, I would say no worry.
This is a used EVAP, it seems to have similar lines like yours, but too bad I can't zoom in too well
https://www.ebay.com/itm/375154311527
.
This used one seems to be clean
https://www.ebay.com/itm/39615573363...3ABFBM1rn51Nll
.At close up detail, your evap rusty spots do look offensive and could be eating the ALU underneath it
That rusy dirt could be rust tranfer from other steel object.
Aluminum "rust"/corossion or oxidation is whitish ALU Oxide.
https://www.allmetalsfab.com/does-aluminum-rust/
Rust transfer to ALU. The plate is alu, the bolt and nut is proabaly 304SS which will rust
If you can clean them small rusty spots and they look spotless after cleaning, I would say no worry.
This is a used EVAP, it seems to have similar lines like yours, but too bad I can't zoom in too well
https://www.ebay.com/itm/375154311527
.
This used one seems to be clean
https://www.ebay.com/itm/39615573363...3ABFBM1rn51Nll
.At close up detail, your evap rusty spots do look offensive and could be eating the ALU underneath it
Thread Starter
Member
Joined: Dec 2020
Posts: 163
Likes: 54
From: A small city
2010 W212 E350
Update:
Having talked again with the shop, the manager showed me that similar spots were also found in other new stock, but they are not so offensive as mine (photo).
To play safe I have emailed the manufacturer to ask for any views about that spots.
Will update further.
Having talked again with the shop, the manager showed me that similar spots were also found in other new stock, but they are not so offensive as mine (photo).
To play safe I have emailed the manufacturer to ask for any views about that spots.
Will update further.
MBWorld Fanatic!
Joined: May 2018
Posts: 6,600
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Maybe those are TOUCH spots for their welding ground wire ?
I am sure EVAP microchannel mini pipe are welded at the ends and not pushed fit, due to 400 PSI capable pressure handling.
I am sure EVAP microchannel mini pipe are welded at the ends and not pushed fit, due to 400 PSI capable pressure handling.
Thread Starter
Member
Joined: Dec 2020
Posts: 163
Likes: 54
From: A small city
2010 W212 E350
Further update:
The manufacturer reverted - "The spots shown are from production, but they shouldn't be too pronounced, as the corrosion protection is no longer present."
In this case, I have less worries and will just change another new one from the shop so as to start my evap project in this weekend....
Just for sharing....
The manufacturer reverted - "The spots shown are from production, but they shouldn't be too pronounced, as the corrosion protection is no longer present."
In this case, I have less worries and will just change another new one from the shop so as to start my evap project in this weekend....
Just for sharing....
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Thread Starter
Member
Joined: Dec 2020
Posts: 163
Likes: 54
From: A small city
2010 W212 E350
Sudden change:
Another reply from the manufacturer wrote:
"The evaporator shown has some minor marks, but they're not in good condition. This one also needs to be returned"
In this case, another new stock offered by the shop is not acceptable. Too bad that I need to return the evap and shop again for another brand or source......
Another reply from the manufacturer wrote:
"The evaporator shown has some minor marks, but they're not in good condition. This one also needs to be returned"
In this case, another new stock offered by the shop is not acceptable. Too bad that I need to return the evap and shop again for another brand or source......
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MBWorld Fanatic!
Joined: May 2018
Posts: 6,600
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Sudden change:
Another reply from the manufacturer wrote:
"The evaporator shown has some minor marks, but they're not in good condition. This one also needs to be returned"
In this case, another new stock offered by the shop is not acceptable. Too bad that I need to return the evap and shop again for another brand or source......
Another reply from the manufacturer wrote:
"The evaporator shown has some minor marks, but they're not in good condition. This one also needs to be returned"
In this case, another new stock offered by the shop is not acceptable. Too bad that I need to return the evap and shop again for another brand or source......
Wow, manifacturer replied so fast. SO GOOD !!!!
I wish most manufacturer has this level of professionalism.
U lucky man.
