How to: Reuse your old Desiccant filter - Smart Car Forums
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post #1 of 35 (permalink) Old 05-02-2018, 05:36 AM Thread Starter
 
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How to: Reuse your old Desiccant filter

We've had a number of discussion about part # A 789 340 33 00, the Dehydrator/Desiccant Filter for the battery pack in the Smart ForTwo (and likely the MB B250e). I recently changed mine to the tune of $53, from the local dealer. I threw the old filter into the left side cubby of the car, and forgot about it...until today, when I moved my (now, unneeded) gloves from that area to get my change purse while in the drive-thru getting breakfast. I saw the filter and picked it up, and noticed it had MANN FILTER stamped on the bottom next to the P/N. I thought, hmm, maybe I can buy this direct from MANN for less.



Then I looked at how it's made....



The end cap pops off using a ball point pen. Silica beads can be bought by the 1.5lb bag for $13.99 on Amazon. I figure you can get at least 3 refills out of that $14 bag...
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post #2 of 35 (permalink) Old 05-02-2018, 06:47 AM
 
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Does popping the lid look like it might degrade the integrity of the cap staying on? Is this even a concern?

This should drive pricing down...
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post #3 of 35 (permalink) Old 05-02-2018, 06:55 AM
 
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Don't forget to store that 1.5lb bag in an airtight container or they'll all go bad.
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post #4 of 35 (permalink) Old 05-02-2018, 09:37 AM
 
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I kind of like the dye indicator type, blue when dry, purple when saturated....
https://www.ebay.com/itm/Reusable-Si...cAAOSwkLhaOOQT
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post #5 of 35 (permalink) Old 05-02-2018, 09:39 AM
 
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I guess the other discussion, is proving you've done it on schedule, for warranty purposes. Maybe dated pics placed in the records is enough, plus the receipt for the desiccant.
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post #6 of 35 (permalink) Old 05-02-2018, 09:43 AM
 
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Also note, you could just simply remove and recharge the silica gel in your oven....
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post #7 of 35 (permalink) Old 05-02-2018, 10:35 AM Thread Starter
 
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Originally Posted by jzchen View Post
Does popping the lid look like it might degrade the integrity of the cap staying on? Is this even a concern?

This should drive pricing down...
It's ABS Plastic, in a controlled temperature environment. Eventually, it'll break, but I think you can get several uses out of each cartridge. It helps that the cap is on the top of the filter (as inserted in the bottom of the battery). I figure the cap's tab will hold up longer than the actual locking tab on the cartridge (see pic).
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post #8 of 35 (permalink) Old 05-02-2018, 10:40 AM Thread Starter
 
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Originally Posted by cornwallav8r View Post
Also note, you could just simply remove and recharge the silica gel in your oven....
Yes, I could. I've had enough experience with PLA plastic in the oven (drying it out so it'll print correctly in my 3D printer) that I don't want to risk it. I suppose this could be applied to what I'm doing, but, I see reusing re-dehydrated beads as grounds for a "you used a consumable beyond it's useful life and that constitutes neglect" in event of a warranty claim. Akin to reusing O-rings on pressurized filters (like an oil filter). Technically safe, probably the out the Manufacturer will exploit to deny warranty coverage. Of course, MMWA says that the OEM has to prove your "modification" wasn't sufficient. So... who knows.

Thing a dehydrator would be safer/more effective than the oven? That's what has worked best with my PLA materials.
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post #9 of 35 (permalink) Old 05-02-2018, 11:03 AM
 
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One hour in the oven at 275F....
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post #10 of 35 (permalink) Old 05-02-2018, 11:11 AM
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Technically safe, probably the out the Manufacturer will exploit to deny warranty coverage. Of course, MMWA says that the OEM has to prove your "modification" wasn't sufficient. So... who knows.
With ALL the unknowns of the smart 451 HV battery pack warranty, not sure this is the hill I plan to die on? After all, M-B smartUSA has a staff of attorneys and I don't . . .

At risk is a battery pack with a cost of several thousand dollars PLUS labor.

Personally, for my MY 15 ED I will spend 3 x $53 (2019, 2021 & 2023 = $159) just in case I am eligible for anything beyond the known 4 year warranty - is it 8 or 10 who knows?

Heck, with a strong tailwind ED AND THE BATTERY PACK may outlive me?
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