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1997 s320, 1994 E320 Cab, 1989 300ce (parting out soon)
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526 Posts
Discussion Starter · #1 ·
Mine crapped out got a cheap chin else's one. That lasted 10 months. Paid 80 dollars for a Behr g hella---still Chinese made. Lasted less than a onth. What have you had success with.?
 

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1997 V140 S420 LWB, 1992 R129 300 SL
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349 Posts
The only one that has actually lasted in my V140, is the OE-regulator that´s installed at the moment. I´ve tried a bunch of cheap aftermarket regulators, and the only thing that is certain about them, is that they will cease to function within a few months. The dealer will rip you off for one compared to those on Ebay, but in the long run it´ll save you both money and all the hazzle.
 

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2008 ML550, 2003 E320, 2003 ML350, 2001 CL600 - former W108/W111/W112/W114/W123/W124/W126/W140/W220
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6,484 Posts
I've had a $20 eBay import one for over a year, maybe two - I would have to check.

The big issue is making sure it's properly installed with a clean heat sink and dielectric grease that's properly applied.

The problem with these is that they generate a great deal of heat during operation, and if they can't dump it, the components overheat and fail. If you don't apply the dielectric grease properly heat transfer doesn't take place and they burn up. Doesn't matter who's it is - they will fail regardless.

Dan
 

· W140 Moderator
"CHRIS" Merc 92 600SEL / Sold > 93 600SE / 93 S500 / 89 560SEL / 413CDI / B180-CDI /A170-CDI
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7,896 Posts
I've had a $20 eBay import one for over a year, maybe two - I would have to check.

The big issue is making sure it's properly installed with a clean heat sink and dielectric grease that's properly applied.

The problem with these is that they generate a great deal of heat during operation, and if they can't dump it, the components overheat and fail. If you don't apply the dielectric grease properly heat transfer doesn't take place and they burn up. Doesn't matter who's it is - they will fail regardless.

Dan

As usual spot on Dan . I had the Behr in my S500 that lasted for years , even in this S600 I have now it has a Behr on it , I think Behr is original what MB used in 140's but em not to sure on that .
That thermal paste ( or what ever it's called ) heat conducting paste ,if you ad to much it wont turn the blower on ,ad to little & it overheats ,it needs to be just right .
Best way to apply that is with your credit card ,just apply it over the regulator & spread it over with the card ,nice & smooth , one light coat were you can slightly see the silver colour shining trough under the white paste , same procedure like on a Home computer on it's processor cpu .:thumbsup:
 

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96 S500, 98 Celsior
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233 Posts
You also need to pay attentions on the blower motor itself. An aged motor tends to consume more current than a new one. Carbon dusts and graphite dusts are accumulated there at the commutator's gaps making current short passes and stresses the regulator.

When your regulator doesn't last long, you'd better check the commutator in the motor too.
 

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2008 ML550, 2003 E320, 2003 ML350, 2001 CL600 - former W108/W111/W112/W114/W123/W124/W126/W140/W220
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6,484 Posts
I should probably clarify my statement to say "thermal grease" rather than dielectric grease, as it's not the same thing as the stuff you use on ignition and electrical connections.

Sorry for any confusion.

Good comments about checking the blower motor, too. Whenever I have the filter out I check the blower motor and put a couple drops of ATF on the bearings for lubrication.

Dan
 
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