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Oil cooler fan switch: on the OC inlet or outlet??

D drallen
I've mounted mine on the external oil cooler OUTLET, but I've yet to hear it come on after highway use. My elec oil temp gauge says 190 - the sender is off the case oil pressure fitting with an adapter from Berg or someone, and I also have Mainely Custom oil dipstick thermo that read 190 when the motors had hot highway use and is up to temp, but I never hear the fan kick on. The elec side of the fan & relay works when I jump the relay. I suppose I could run a manual fan switch, but the whole idea was to use a oil temp switch to turn on the OC fan at 180 degrees....
Advice? I checked the search on forum and there seems to be older articles that go either way on mounting the OC fan switch ( OC inlet or outlet??? ) Thxs in advance.
Doug
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D drallen
I've mounted mine on the external oil cooler OUTLET, but I've yet to hear it come on after highway use. My elec oil temp gauge says 190 - the sender is off the case oil pressure fitting with an adapter from Berg or someone, and I also have Mainely Custom oil dipstick thermo that read 190 when the motors had hot highway use and is up to temp, but I never hear the fan kick on. The elec side of the fan & relay works when I jump the relay. I suppose I could run a manual fan switch, but the whole idea was to use a oil temp switch to turn on the OC fan at 180 degrees....
Advice? I checked the search on forum and there seems to be older articles that go either way on mounting the OC fan switch ( OC inlet or outlet??? ) Thxs in advance.
Doug
FM Former Member
An easy way to check if your fan switch, et all, is really working is simply come to a dead stop after an extended freeway or other high speed run, sufficient to raise that oil temperature. Turn the engine off. Immediately turn the ignition back ON (do not start the engine). You should be able to hear the fan blowing loud and clear.
FM Former Member
Danny -- in one of those "never" moments that I dissagree with you, I don't get the logic others use when installing the fan thermo Before the cooler.

It seems more common sense to put it After the cooler. There is no reason to turn on the fan until the oil is more than 180 coming OUT of the cooler.

If oil went into the cooler at more than 180 but cooled down in the "cooler" to less than 180 by the time it exits the cooler then there is no requirement to enhance the cooling by turning on the fan. In that instance the cooler did its job (maybe that's why they call it a cooler) and more cooling is not necessary.

I say the fan thermo goes on exit end of the cooler.
Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member
As it happens, I'm getting new tires on Pearl today and pulled the wheels at home to truck on over to the tire place.

So.......I looked at my oil cooler by the back wheel and.......sonofabitch!!! Damn switch is on the Output side of the cooler!!!

Then I remembered (just doing the remembering part is getting tougher by the year) that I put on a different oil filter mount and re-routed the hoses a couple of years ago and moved the thermo switch from one side of the cooler to the other for ease of hose routing, and because I thought it out as Mark did and just decided to move it.

Of course, the engine makes enough noise that I can never tell if the fan is running or not, other than that the oil temp never goes over 200.
FM Former Member
Danny, which is exactly my point: Why cool it more unless it is over 180?

A. We all agree there is no reason to send it to the remote cooler unless it is coming out of the diverter thermostat over 180.
B. Using that same logic; there is no reason to turn on the remote cooler fan unless it is coming out of the remote cooler over 180.

Seems to make sense . . . .
MangoSmoothie.caMangoSmoothie.ca
I'll chime in here too and offer my $0.02

i have a t-stat, 72 plate cooler w/ 8" fan and temp fan switch.

i installed my t-stat before the cooler (obviously), but decided to install my temp switch for the fan after the cooler.

the way i figured it - oil isn'tcooled until the t-stat opens up at ~175 degrees. then cooler does it's thing. If cooler is insufficient, and the oil coming out of the cooler is more than 175 degrees, the fan turns on.
RS-60 markRS-60 mark

Carley  -- 

 

My fan continues to run after the ignition is turned off.  But I don't consider there is much benefit because of it.  Many times I have considered tying the the fan circuit into the ignition switch circuit so that when I turn off the ignition it also turns off the fan.  But then, there is little negative consequence in allowing the fan to just go ahead and run after the ignition is turned off until the oil in the thermo switch cools off to less than 180*and automatically turns off the fan.

 

So to answer your question, I don't think there is a compelling reason one way or the other.

Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member

Is it tow-may-toe or tow-mah-toe?

 

Mine goes off with the ignition switch.  The fan winding down as soon as the engine stops is like Doc Brown's DeLorean in Back to the Future.  I love it.

 

It TOTALLY doesn't matter if your fan stops or keeps going once the engine stops.  I happen to like the concept that when I turn off the key and walk away, everything stops.

 

BTW: My fan switch is on the output of the cooler.  If oil output from the cooler is over 180-ish the fan kicks on.

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