Is there a way to attach an OE fan to an electric motor? Thinking specifically of a 603, ~80% of the fan is offset from the radiator and ~80% of the radiator isn't ducted to the fan by the shroud. Centering the fan and shroud over the radiator with an M103 shroud should improve low speed cooling and AC performance.

Sixto
87 300D

Forget about an electric fan on a 603. There's only 3 inches of clearance and most good electric fans are 3.7 to 4" thick. If you find a fan that fits it won't pull as much air as the old one.

That's kinda my point. The water pump pulley flange is close to the radiator. There's more room at the center of the radiator core.

Sixto
87 300D

That's similar to what this guy did:

http://ecomodder.com/forum/showthread.php/electric-vs-belt-driven-cooling-fan-3365-5.html

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

I was thinking about this today and managed to track down a site I'd read forever ago that described a similar idea in a z28. Use that volvo fan from the previous post, or the similar Ford Taurus fan. I don't think its big brother the Lincoln Mark VIII fan will fit depth wise, but if it would, the fan shroud would be almost perfect for the radiator. Use the Volvo controller mentioned in this link, and one of the Mercedes 3 pin fan fan switches that I'll bet will thread right in where most of us have a useless vacuum switch from the EGR system.

http://www.nastyz28.com/forum/showthread.php?t=200028

Not sure if this is the fan switch you would want, I know they come in different temp specs and the BMW ones mentioned in the link look like they thread in the same, just use different connectors. It'd be nice to make it look stock...

http://www.**********.com/Part-Number/Temperature-Sensor-on-Cylinder-Head-(3-Pin-Green)-__0065454524_BEH_1ABD284D.aspx

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'82 300SD - Somewhere over 220k - Becoming reliable...

Just picked up a Volvo fan and controller relay, and it doesn't look like there's any way to fit it into my E300D. Mercedes' love of efficient space usage has left almost no room between the rad and the serpentine belt and all its associated pulley-driven friends.
The guy on ecomodder must have had a 250D or something; the OM606 simply leaves NO room for an e-fan.

However, in the process I removed the shroud around the aux fans up front. There was almost a quart of dirt, leaves, and bug parts collected in the bottom between shroud and radiator. The fans themselves are mounted to a rear frame with integral ducts for the fans, so no mechanical problems or lost performance there. I don't know why the front shroud is there in the first place, it just blocks airflow. Ilse seems to run about 3-5 °C cooler without the front shroud, and AC at idle is a little better as well.

I think I'm going to run the aux fans full-time until I get the fan clutch fixed.

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RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)

Huh, here I thought the front shroud was a good thing. Maybe it was just the dirt removal? I'd say that dirt blocks 20% of the shrouded area.

FYI There is a seller on ebay selling fan clutches for the 617 new for $70 bucks.
At that price I had to try it. It has the exact same casting marks as the BEHR that I took off, it is just missing the tag with part number. It has been on now for two days but the weather has been cool. It is forcast near 100 later this week so I will let folks know how it works.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660

I have been running the $70 new ebay fan clutch for a while now and it seems to work fine. It has all the casting marks of the original Behr and I wonder if maybe it is a behr without the label.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660

Lots of courage and no AA membership

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I choose to be happy, even when the Mercedes is being awkward, lol