I would like to use it...

As an aux fan.

I have removed the A/C from the car as it came to me with no compressor, about 6% of the compressor mount bracket and bolt.

Living in NW Washington, I need to roll down my windows on "HOT" days just to keep the mechanism form seizing up.

I would like to know if there is a way to use the auxiliary fan as auxiliary engine cooling.

If someone knows, you will have to speak very slowly. I know enough to orient polarized blades on an extension cord, red to + and black to -, but any more than that can be time-consuming.

I am hoping a sensor switch can be installed in the head or thermostat housing to send the signal to the fan. Or is it simpler?

Any help appreciated!

Thanks!

snapped_bolt

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'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....

You could make it simpler by putting a manual switch in the cabin and watching the temp.


The switch on the tstat housing could work though. Start by digging around looking for voltage and amp load needed for that fan.

then look at the 1984 190d fan switch - I bet it will screw into that threaded portion of the housing. that switch engaged an electromechanical fan clutch, so it may have a very different electrical profile. But it does imply that there is a switch that will work for this situation by doing as you suggest.


It would be in your best interest to supply the new power from a fused source.

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...mine seems to have no threaded connections for any fittings-but there is a spot apparently reserved for future addition of a fitting (in-factory?) I will be replacing the thermostat soon and I can drill that out and tap it for a fitting. The issue for me is *which one*?
I guess there would be another issue- at what temp should it send the signal to the fan-for on, and off?

Thanks!!

snapped_bolt

__________________
'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....

No need to drill it out if there is already a recess - just tap the recess / bore that is there. does not need to be exposed to coolant.

The 190d switch would activate around 90*C - I think. If you could find one for 100 C that would work just fine also. Really depends on what you want. I have had the OM617 turbo over 200 without any ill effects.

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1979 240D Aux fan...
I would like to use it...As an aux fan.

The brilliance of the OP's statement notwithstanding, the temperature switch that is installed in the receiver/dryer grounds the auxiliary fan relay at ~144 deg.F. That temp switch may be installed in a convenient location in the cyl. head or water outlet area. If the aux fan is to be used to supplement the engine driven fan, a switch of about 190 deg. may be more suitable.

I would like to catch the temp before it rises too high, to maintain factory temperatures in traffic, or on a grade. The fan is already there. I will be removing the A/C condenser for more free air flow as well.
Having that A/C out leaves me with a lot of ROOM on the driver's side of the engine- I do not plan on choking that off anytime soon.
With some luck, the electric fan roaring in traffic may "quiet" the clatterwagon a bit...

I'll still need to figure out the exact wiring....

Thanks!!!

snapped_bolt

__________________
'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....