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.

You would get better airflow and cooling to remove it entirely.

at speed as well as while stopped?

you don't run with either, last I checked.

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.

this is for other reasons, the cooling system works but drips a little.

for the love of mike, I know procedures.

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.

__________________
1983 123.133 California
- GreaseCar Veg System

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.

what A/C?

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.

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.

__________________
'95 E300 Diesel, 264,000 Miles. [Sold it]

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.

__________________
1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER

There is no high pressure switch on a W123.

You've got to be kidding!
Maybe find the old nose cone off a rocket......


Forced, you're getting "farther out there" every day........

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'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

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.

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'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

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.