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#16
08-19-2003, 09:07 PM
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I don't know if you would want to go this route but ackits.com has some electric fans that will push/pull some serious air (875-1800 cfm) and they come with wiring harness and relays. Makes me glad that both of my fans do work, I would overheat real quick on days like this if they didn't.
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k 
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#17
08-21-2003, 07:57 AM
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Warden:
The bi-metal strip/spring that I am referring to is approximately 1/2 to 9/16 by 2 inches and maybe .020 to .030 thick. On my fan clutch this is held to the front center by several cast in tabs. The rear face of the strip/spring pushes against a small rod that goes into the center of the clutch and controls the internal movement of the fluid. Maynard Smith.
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82 300D 87 300SDL 90 300TE 4matic
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#18
08-21-2003, 10:56 AM
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Wasuchi,
With a properly functioning cooling system on your 1985 300D, and a working stock fan & clutch, your car should be almost impossible to get over 100C under any conditions, even if the little stock electrical fan doesn't work. The cooling systems have plenty of capacity on these cars. I haven't been able to get my '84 over 95C ever, and temps where I live were 105-110F most of July... Point being, there is no need to add extra or larger fans to keep the engine cool. Now if the intent is to improve AC performance at idle, or when the car is not in motion, that's a different story, and bigger/better fans might help! 
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#19
08-21-2003, 01:25 PM
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gsxr,
That's what I was saying...... I'm glad they both do work right. And you're right, I never see more than 95, usually 85-90. My aux fan already is set to run anytime the a/c is on so it stay's "cool" at idle too, another fan wouldn't help me a bit. Now on my 2000 F350 one of those electric fans would really help the a/c at idle since it doesn't have one.
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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#20
08-21-2003, 02:33 PM
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I thought the electric fan came from the factory set up to always be on whenever the a/c was on.
BTW, although I'm sure it could use a flushing, my cooling system's happy. I haven't had a chance to check the bimetallic spring yet...
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#21
08-21-2003, 04:23 PM
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The factory setup on late W123's is a temperature switch at the receiver-drier, which triggers the electric fan at 144F. The AC doesn't even need to be on, if the drier gets to 144F from ambient temps, that will trigger it. Later cars (124, 126, 201, etc) had much more sophisticated 2-speed fans setups with relays and various triggers (and use AC pressure, not temperature, as the signal.)
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