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  #1  
Old 05-26-2008, 01:27 AM
TheDon's Avatar
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wiring aux fan to a switch

Ok, has anyone done this? I would like to make the fan switched due to the fact I get stuck in traffic and the clutched fan in the middle of summer FL isn't cutting it. I have verified that the clutch operates as per normal. I keep my coolant topped off ( small leak, usually need to put a gallon of distilled or coolant in every two months.. that is total, not at once)

Plus I have some experiments I would like to do with grill blocking to better the aero of the car.

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  #2  
Old 05-26-2008, 01:33 AM
ForcedInduction
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You would get better airflow and cooling to remove it entirely.
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  #3  
Old 05-26-2008, 01:36 AM
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at speed as well as while stopped?

you don't run with either, last I checked.
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  #4  
Old 05-26-2008, 01:46 AM
ForcedInduction
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I do not have an electric fan but I do use the engine fan during the warmer months (April-November). During winter its cold enough (In CO anyways) that the engine stays at operating temperature with convection when stationary and natural airflow when moving.

The electric fan has a big motor, any place that is covered by it does not get much airflow.
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  #5  
Old 05-26-2008, 10:37 AM
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this is for other reasons, the cooling system works but drips a little.

for the love of mike, I know procedures.
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  #6  
Old 05-26-2008, 10:47 AM
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Quote:
Originally Posted by ForcedInduction View Post
You would get better airflow and cooling to remove it entirely.

Yeah but you don't want to remove it. He still needs A/C in that hot Florida
sun!

Just splice into the wires that lead to the a/c drier. You can actually put a "T" connect right that the temp switch wire connectors, that way you don't cut into the lines.
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Last edited by DeliveryValve; 05-26-2008 at 10:54 AM.
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  #7  
Old 05-26-2008, 10:55 AM
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Quote:
Originally Posted by TheDon View Post
for the love of mike, I know procedures.

Quote:
Originally Posted by DeliveryValve View Post
Yeah but you don't want to remove it. He still needs A/C in that hot Florida
sun!
If the a/c system was working properly, the aux fan would operate as designed and a manual switch would be unnecessary. But I am sure that TheDon already knows that.

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Originally Posted by DeliveryValve View Post
Just splice into the wires that lead to the drier.
The fan relay is a lot closer. But I am sure that TheDon already knows that.
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  #8  
Old 05-26-2008, 10:56 AM
TheDon's Avatar
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Quote:
Originally Posted by DeliveryValve View Post
Yeah but you don't want to remove it. He still needs A/C in that hot Florida
sun!
what A/C?

Quote:
Originally Posted by tangofox007 View Post
If the a/c system was working properly, the aux fan would operate as designed and a manual switch would be unnecessary. But I am sure that TheDon already knows that.



The fan relay is a lot closer. But I am sure that TheDon already knows that.
see, if I had a chasis wiring diagram, I would be.. oh, just snip that, add some wire, heat shrink, and a switch and viola.
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  #9  
Old 05-26-2008, 12:02 PM
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You can put a switch across the HIGH pressure switch of the AC system. (Its on your AC Dryer). When you short out the two wires going to that switch the Auxiliary fan(s) will come on at low speed.

I've done it on my car.
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  #10  
Old 05-26-2008, 12:30 PM
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I'd post a wiring diagram from the AC FSM, but the ones for your car are literally about 20 pages long depending on the position.
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  #11  
Old 05-26-2008, 12:30 PM
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Quote:
Originally Posted by pberku View Post
You can put a switch across the HIGH pressure switch of the AC system. (Its on your AC Dryer). When you short out the two wires going to that switch the Auxiliary fan(s) will come on at low speed.

I've done it on my car.
There is no high pressure switch on a W123.
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  #12  
Old 05-26-2008, 12:36 PM
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Quote:
Originally Posted by TheDon View Post

Plus I have some experiments I would like to do with grill blocking to better the aero of the car.
You've got to be kidding!
Maybe find the old nose cone off a rocket......


Quote:
Originally Posted by ForcedInduction View Post
I do not have an electric fan but I do use the engine fan during the warmer months (April-November). During winter its cold enough (In CO anyways) that the engine stays at operating temperature with convection when stationary and natural airflow when moving.

The electric fan has a big motor, any place that is covered by it does not get much airflow.
Forced, you're getting "farther out there" every day........
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  #13  
Old 05-26-2008, 12:41 PM
Craig
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Quote:
Originally Posted by tangofox007 View Post
There is no high pressure switch on a W123.
There's one on mine, if I touch the leads together the fan runs.
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  #14  
Old 05-26-2008, 12:43 PM
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Quote:
Originally Posted by Craig View Post
There's one on mine, if I touch the leads together the fan runs.
There is a low pressure switch and a temp switch. These cars did not come with a high pressure switch, but now they have a hi/lo pressure switch due to R134a and higher head pressures.......
The switch that controls the fan is the temp switch.
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'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #15  
Old 05-26-2008, 12:47 PM
Craig
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Quote:
Originally Posted by JimmyL View Post
There is a low pressure switch and a temp switch. These cars did not come with a high pressure switch, but now they have a hi/lo pressure switch due to R134a and higher head pressures.......
The switch that controls the fan is the temp switch.
OK, I think you are correct; the fan works off a high temperature switch, not high pressure. The high pressure switch is for R-134a systems. The low pressure switch is for the compressor cut-off.

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