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Old 02-13-2007, 12:45 AM
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useing resistor to turn fan on sooner...?

Got a prob with a 92 tarues(ford)...
I want to put a resistor on temp sensor to brain so fan comes on at lower temp-any feedback?

not exacatly hod rod...i know-

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Last edited by Haulin327; 02-13-2007 at 12:59 AM.
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Old 02-13-2007, 01:21 AM
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need to know why you want the fan to come on sooner??? what is the problem you are having??Brian
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Old 02-13-2007, 05:50 AM
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Maybe your temp sensor is bad..........
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Old 02-13-2007, 10:46 AM
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fan isnt coming on until temp gauge is at 3/4-
temp is ok while driving thru airflow....
:)
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Old 02-13-2007, 11:07 AM
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I think you might want to figure out what "3/4" of the guage represents. It may be a non issue-

K
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Old 02-13-2007, 11:08 AM
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Thats pretty much what they are supposed to do....Todays engines are designed to run warmer......My wifes Tempo does the same.

I guess if you wanted to, you could run a switched wire to bypass the sensor............
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Old 02-13-2007, 02:44 PM
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I am still wondering about the lowering or raising of
resistance(ohms)to the contol unit from the temp sensor would do...
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Old 02-13-2007, 03:17 PM
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lowering the voltage ( adding resistance ) will cause the temp sensor to read low. the closer they get to full refrence voltage ( 5,8, 10 or sometimes 12v ) the hotter they read.
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Old 02-13-2007, 04:31 PM
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would putting a resistor on sender to computer make fan come on sooner or later ?...
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Old 02-13-2007, 04:38 PM
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Doc here,

The sensor for the fan is not a resistance based device..It is a bimetallic SWITCH..adding resistance to it will change nothing (except possible burnout of the resistor)

To lower the value of the turn on time, you must select a Sensor SWITCH that has the temp values you are seeking. (160 degrees, 180 degrees , 195 degrees and so on..) Probably an aftermarket type will be needed.

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Old 02-13-2007, 04:52 PM
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I have a 91 taurus station wagon with a 3.8, ( It was free, passes smog, and it has air conditioning that works. so?)
The temp stays in the 3/4 range all the time. Never had a problem because of it.

If you can get in the paper buyers guides at your parts stores, you may be able to find a sensor with the same fitment, but a lower temp. I have a Four Seasons catalog that shows a picture, an application and gives a on/off temp.

Cross referenceing to a lower value is time consuming, unless you can find an aftermarket supplier with one already sorted out.
Some of the wiring companies as well as jegs and summit sell them. Whether or not they'll fit that taurus is another matter.

Try Ford Motorsport.



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Old 02-14-2007, 01:50 AM
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You need to find out if you are actually having a overheating problem?? There is a lot of engineering that goes into the design and operation of modern pcm/ecm controlled engines. If you start trying to " cheat" the system you could end up with bad fuel mileage, decreased performance, increased emissions (if you live in a state where they check that). In some cases it might shorten the life of the engine. I know on my wifes 93 lumina 3.1L the fans didn't come on till like 210* if I remember correctly. That's why cooling system maintenance on modern/newer vehicles is critical. There is a fine line between normal and problem. I also know that in the early 80's Toyota changed the head gasket style on the 22R engine. It had restrictions for the water passages, this was done to increase cyl head temp to lower emissions. But the flip side to that coin was the aluminum head, if you had a small problem with overheating you could be reworking the cylinder head or worse yet complete overhaul from scored cylinder walls. I've seen it happen several times. If you can get your hands on something like a raytek heat sensing gun and check the temp at a few places in the cooling system you should be able to tell if it's overheating. The service manual should give a fan on temp spec. Good luck with what ever you decide to do just be careful Hot antifreeze burns Brian
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Old 02-14-2007, 09:38 AM
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I think most of the Fords have a dual speed fan that compensates for increasing temperature conditions.

If stage one is insufficient and the temp continues to rise, stage two kicks in.
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