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  #1  
Old January 25th, 2015, 10:34 PM
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Electric Fan Conversion

I just replaced the thermostat (180 degrees) on my '86 D110, V8 and the temperature gauge will now barely move, where in the past it used to rest about 1/3 of the way from the left, when the truck has fully warmed up.

The truck runs fine, and doesn't seem to run "too cold", if there is such a thing. I'm in SoCal where the temperature never goes below 50 degrees in the winter but can sometime creep up into the low 100's in the summer.

Based on all of this, and because my fan and fan shroud need replacing, I am considering swapping out to an electric fan setup.

1) What's your opinion on this? Is this recommended on the defenders?
2) If yes, how many fans, 1 or 2?
3) What brand do you recommend?
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  #2  
Old January 25th, 2015, 10:40 PM
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Search "Taurus" and everything you will ever need to know will come up.
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  #3  
Old January 26th, 2015, 06:39 AM
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So it looks like the Ford Taurus dual speed electric fan is the way to go, although the majority of the posts refer to the 200TDi and 300TDI. A couple of questions then:

1) Is the electric fan conversion recommended for a V8? Apparently, the Diesels do not produce as much heat as the gas engines, and require less cooling to begin with..
2) Will the Taurus fan fit behind the radiator in a V8? A few posts seem to think NOT.
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Old January 26th, 2015, 06:51 AM
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Interesting idea. Subscribed.
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  #5  
Old January 26th, 2015, 06:57 AM
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New thermostat is faulty.
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  #6  
Old January 26th, 2015, 09:09 AM
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Quote:
Originally Posted by leastonce View Post
New thermostat is faulty.
sounds like it
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  #7  
Old January 26th, 2015, 09:25 AM
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Faulty new thermostats are fairly common. There should be no heat in the radiator until the engine reaches normal operating temperature. If there is, the thermostat is leaking.

On the fan question, it is my understanding that the Taurus fan hits the water pump and you need to go with a dual fan setup for clearance reasons.
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  #8  
Old January 26th, 2015, 09:38 AM
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Quote:
Originally Posted by leastonce View Post
New thermostat is faulty.
That's what I was thinking, or possibly coolant temp sensor failure? Or wrong temp sensor altogether?
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  #9  
Old January 26th, 2015, 10:30 AM
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The temperature sensor was not touched. The temperature gauge is registering, but much lower than before.

It didn't even occur to me that the new thermostat could be faulty, possibly stuck open, or maybe even not seated properly in the housing when I installed it, but how would that affect the engine temperature? Even if there were no thermostat installed at all, wouldn't the engine temperature reach it's normal operating range at some point? It would just take a lot longer obviously.
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  #10  
Old January 26th, 2015, 10:32 AM
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No, the engine would not ever reach normal operating temperature unless pushed very hard. The thermostat is what control the engine temperature. IME, half of new thermostats are faulty.
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  #11  
Old January 26th, 2015, 11:02 AM
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Essentially - an engine and radiator / fan setup is capable of cooling the engine under the harshest working conditions. Under less than harsh conditions the thermostat stays closed to allow heat to build up in the engine and reach operating temp.

A thermostat keeps the engine warm rather than keeping it cool.

It can fail in 2 ways ...

- Fail open - engine never gets to temp

- fail closed - engine overheats as coolant doesn't flow into the radiator.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #12  
Old January 26th, 2015, 11:34 AM
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Samer,
Sorry I missed the V8 part. On my NAS 90 I used a dual fan model from Flex Fan. It wasn't cheap but it cooled very well.
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  #13  
Old January 26th, 2015, 12:08 PM
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Flex fan dropped that unit. There are similar dual 12 inch units out there.
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  #14  
Old January 26th, 2015, 07:28 PM
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I'm using an electric dual fan set up out of Chrysler minivan, almost exact fit on a v8 radiator on a classic.
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  #15  
Old January 26th, 2015, 08:48 PM
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Carlos,

Can you please be more specific as to which year Chrysler minivan you got that dual fan setup from?

Thanks
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