Should electric fan be automatic? - Defender Source
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  #1  
Old July 7th, 2013, 04:11 PM
itch
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Itch Smith
95 d90
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Should electric fan be automatic?

95 D90 inches up to the red-zone on the temp gauge while plowing through sand or muck and really working the engine on hot days. It also does so if I leave it idling in 90+ temps. Everything has been recently overhauled including the electric fan. My question is, should the fan kick-in at some threshold? It only turns on now when the A/C is switched-on. I seem to recall that prior to the overhaul the old electric unit did come on automatically when the temp started climbing. IF so, then is there an easy way to get it back to being automatic without installing a separate switch and relay?

Thank you.
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  #2  
Old July 7th, 2013, 06:59 PM
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John B.
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There is a switch to turn it on, but it is at a high temperature. The engine driven fan should be controlling the temperature. I would make sure your viscous unit is locking up.
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Old July 8th, 2013, 09:21 AM
itch
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Itch Smith
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Thanks.

Viscous is relatively new. Is the switch easily accessible and what sensor is it tied to? - Did not see one. Should it kick in right at the "red" zone? I let the truck get right up to the red before I shut it down - no fan.
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Old July 8th, 2013, 09:40 AM
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Jason England
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The electric fan is only to assist with the AC .... it's not going to do much to prevent overheating on the engine.

Check you radiator is good ( even temp hot and bottom ) and that your system pressurizes and doesn't have an air lock. Also check the thermostat to make sure it opens ... after that you are probably looking at a faulty head gasket.
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Old July 8th, 2013, 10:20 AM
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Quote:
Originally Posted by itch View Post
95 D90 inches up to the red-zone on the temp gauge while plowing through sand or muck and really working the engine on hot days. It also does so if I leave it idling in 90+ temps. Everything has been recently overhauled including the electric fan. My question is, should the fan kick-in at some threshold? It only turns on now when the A/C is switched-on. I seem to recall that prior to the overhaul the old electric unit did come on automatically when the temp started climbing. IF so, then is there an easy way to get it back to being automatic without installing a separate switch and relay?

Thank you.
I just had this discussion last week with Peter @ J.White's in Framingham.
Peter was shocked to see that I was running a 100% manual switch with an electric Kenlowe puller fan with stock radiator and 300Tdi. I have never used the fan (only to make sure it still works) and the temp never gets to halfway, just hovers slightly below halfway. We checked with an infrared and it was between 180-190 at the head (which is where its supposed to be).

It may depend on your engine and cooling system, but the point here is that Peter had a pretty solid solution for an automatic switch for the electric fan. I simply don't see the need for it in my case. I have never come close to overheating and shoudl I ever really stress the motor by towing longances or crawling through sand when it's 100 degrees, I'll definately be vigilant of the gauge.

Find Peter at J.Whites in Framingham (508) 872-4752.
Again, my setup is much different than yours but an automatic electric fan setup is pretty simple to set up properly regardless of your type of engine.
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Old July 8th, 2013, 11:12 AM
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John B.
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If you are overheating, something is wrong. Check that the viscous unit is locking up. Take a rolled up newspaper and carefully try and stop it when the engine is in the red. It should not be able to stop.

Is the radiator hot? This is to make sure the thermostat and water pump are functioning.

I'm not that familiar with the V8 setup, but the switch should be after the thermostat for the pusher fans.
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Old July 8th, 2013, 11:19 AM
itch
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Itch Smith
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Thanks guys. Since the radiator, fan, pump are new and the they are pumping and working, I am going to go with the viscous coupling and see what happens.
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