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  #1  
Old 06-22-2009, 11:02 AM
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124 Auxiliary Fan conversion

Couple questions. Would converting the single auxiliary fan on my 88 300CE to a dual fan from a later 124 make much of a difference in terms of cooling the engine and the a/c system? Secondly, is there any problem fitting the dual fans into an earlier 124?

Thanks for any help.

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1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k
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  #2  
Old 06-22-2009, 02:09 PM
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You could make the ac aux fan run at the higher speed with a relay.
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Old 06-23-2009, 03:11 PM
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Where would I find such a relay?
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I never go far without a little Big Star

1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k
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  #4  
Old 06-23-2009, 03:54 PM
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http://radioshack.com/product/index.jsp?productId=3020762
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  #5  
Old 06-25-2009, 03:16 AM
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why?

Quote:
Originally Posted by remotemark View Post
Where would I find such a relay?
Does your tag read Heaven, ass & string? (If I translate the German correctly)

What does it refer to? Is it a saying like something is held together on a wing and a prayer?

John in San Antonio
(who is waiting to see about your conversion to maybe try on the 300E)
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1978 280CE Astral Silver now 59,xxx miles and counting "Silber-Kugel"
1986 300E Black Pearl Metallic 143,xxx miles 5-spd daily driver w/ blk leather "Schwarz-Schönheit"
1989 190E 2.6 (euro) 5-spd Desert Taupe 112,xxx kms Had to leave behind in Germany!!! "Helga"
1983 300D Pastel Beige now 312,xxx + miles SOLD

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  #6  
Old 06-25-2009, 12:03 PM
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Where would the relay be installed and how would it make the fan run faster?

Arthur, I believe my '88 260E could use the same treatment, but I don't quite understand how it would work.

Thanks.
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  #7  
Old 06-25-2009, 12:17 PM
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If you understand the basic operation of the low fan circuit, the single wire terminal on the R15 pre-resistor is the feed for the low fan [ the resistor is in series w/fan motor and that drops the voltage to accomplish a low fan speed].

So if you take that wire off R15 and use it to trigger a seperate relay [ coil side], you can then use a seperate 12V battery V to run the fan on high speed , thereby by-passing the R15.
So, on he contact side of relay [ 30 and 87] , you grab 12v battey source and bring the other side of relay contacts over to the 2 wire terminal of R15..that takes R15 out of the circuit, giing you a high a/c fan vs the stock low fan. It is still triggersed by the a/c pressure swtch circuit b/c you are using that stock circuit and relay to trigger your higher amp relay [ which is required for the higher current load of a high fan speed]

One can also bridge the high side sw S/32 with a cabin sw to give the operator a manual over-ride of the whole fan system, thereby allowing for manual operation when needed [ like towing, traffic jambs, etc]

This over-ride will not change any stock circuits, it simply over-rides those circuits and when not in use , you are back to normal circuitry..a nice feature.
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Old 06-25-2009, 12:21 PM
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Quote:
Originally Posted by jwhughes3 View Post
Does your tag read Heaven, ass & string? (If I translate the German correctly)

What does it refer to? Is it a saying like something is held together on a wing and a prayer?

John in San Antonio
(who is waiting to see about your conversion to maybe try on the 300E)
Heaven ass and twine. It's an old mild expletive. When I was a kid in Germany, I used to hear it from my tradesman family members and relatives frequently, typically when a granite paving stone would not fit in place or a piece of wood split.

Sometimes you can hear it in WWII movies.

Another one of the same ilk was Donner Keil noch ein mal!
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I never go far without a little Big Star

1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k
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  #9  
Old 06-25-2009, 12:31 PM
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Thanks for the detailed explanation!
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  #10  
Old 06-25-2009, 12:43 PM
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You're Welcome.

I would also add an in-line fuse on the load side of the added relay...Same amp spec as High fan circuit uses.
I don't have your schematic up at this time for that fuse spec, but I do know the schematic wiring itself from memory..
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Old 06-25-2009, 01:34 PM
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Well, this is a bit beyond my understanding of the electronics. Where is this resistor?

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I never go far without a little Big Star

1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k
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