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87 300d 603 - why two fans question
I put a new vacuum pump on the 87 the other day and then drove it around without putting the metal fan or viscous clutch on. It is cool here - mid 60s - and the engine temp didn't get much above 80. But I realized that the absence of the fan meant she was a lot quieter than usual. My question is, why is there an electric fan and a normal engine fan with a clutch? Why not just electric fan or fans like later cars? My electric fan is big, seems like it moves a lot of air. And it seems like it should be sufficient even in the heat of a Las Vegas summer as my 211 gasser stays cool all the time.
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DS 2010 CL550 - Heaven help me but it's beautiful 87 300D a labor of love 11 GLK 350 So far, so good 08 E350 4matic, Love it. 99 E320 too rusted, sold 87 260E Donated to Newgate School www.Newgateschool.org - check it out. 12 Ford Escape, sold, forgotten 87 300D, sold, what a mistake 06 Passat 2.0T, PITA, sold Las Vegas NV |
#2
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Because a puller fan is far more efficient than a pusher fan. The electric fan is there only to augment airflow across the A/C condenser. With the ambient temp around 60F just movement of the car is enough to cool the engine. In the summer, forget it. With the A/C on in the summer double forget it.
If you want to take the time and effort to do so, you can convert to an electric puller fan if you get a powerful one that's skinny enough to fit where the mechanical puller fan goes, upgrade the alternator, and install some fan control circuitry. Other than making yourself feel good and having more precise control over the fan trip points, you won't see much difference. Maybe a couple mpg in fuel economy, maybe not. |
#3
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Quote:
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CENSORED due to not family friendly words |
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