Delta fast response temperature sensor
Take a look at this website:
http://www.dccontrol.com/
With my MP FMIC i did NOT like the (1) one speed fan.
Maybe this can help with your factory fan.
The Delta variable speed fan control keeps the engine at
a CONSTANT temperature by regulating electric fan speed.
In other words, if the engine temp increases so does the fan speed,
and as the engine cools the fan speed decreases.
I had installed a Hayden temperature sensor and relay
to turn on the fan sooner because
FORD sensor/computer does not turn fan on until 210+.
The one speed fan would go full blast when engaged
by the Hayden thermal sensor OR nothing, and very noisy.
I did not like the noise from the fan at full blast.
I did not like the engine temperature CHANGING between
medium and low temperature on the gage, due to the way Hayden's temp sensor is set up.
Running the fan full on has got to reduce the fans lifespan.
Engine temperature fluxuation can NOT be good for the HG.
I just put a Delta Current Control in and it WORKS as claimed.
and is surprisingly quiet.
Just set the radiator temp per
http://www.dccontrol.com/fk35.htm
Now when I turned off the engine the fan is still turning but very quiet.
(vs full blast). I like the post radiator cooling
However, I wedged the temp probe sensor between the fins and the housing,
as I could not get the probe between the fins.
I think I may put a Delta current control on my tranny cooler fan.
.