Electric Fan clutch not speeding up when Hot ('07),

[crazytimme]

The electronic controlled fan clutch on my 2007 Expedition wasn't increasing speed when the engine would get hot so i replaced it. According to Torque Pro it would run about 350-450 RPM from Idle through the RPM band.
Engine would only get hot when towing or off roading up a hill going slow, pretty much not enough natural air flow.

I replaced the fan, At start up during initial warm up the new fan will spin 1,000-2,000 (and supper load).
After the engine is warmed a bit it will drop down around 450-550 rpm. I finally took it off roading, and after pulling a long steep hill with defrost on I noticed it had gotten up to 210°, and the fan was still running about 500 rpm.

I dont know if the new fan is bad (it was a cheap aftermarket one, or if for some reason the truck wasn't sending a signal, or if there is an open in the circuit.
No codes at all before or after.

 

[sjwelds]

210° "may" not be hot enough to engage the fan. Not sure what the temp threshold is...

 

[07navi]

The electronic controlled fan clutch on my 2007 Expedition wasn't increasing speed when the engine would get hot so i replaced it. According to Torque Pro it would run about 350-450 RPM from Idle through the RPM band.
Engine would only get hot when towing or off roading up a hill going slow, pretty much not enough natural air flow.

I replaced the fan, At start up during initial warm up the new fan will spin 1,000-2,000 (and supper load).
After the engine is warmed a bit it will drop down around 450-550 rpm. I finally took it off roading, and after pulling a long steep hill with defrost on I noticed it had gotten up to 210°, and the fan was still running about 500 rpm.

I dont know if the new fan is bad (it was a cheap aftermarket one, or if for some reason the truck wasn't sending a signal, or if there is an open in the circuit.
No codes at all before or after.

Get it hotter and see what id does. Remove some coolant if you have to.

 

[crazytimme]

210° "may" not be hot enough to engage the fan. Not sure what the temp threshold is...

Good point, I runs usually around 179-184, and spikes to 192, if it gets to 194+ I take action, A/c(defrost) off, heater on.

Mostly concerned about my Tranny temp and protecting the trans fluid, its to much of a pain and high cost to change to often.

Turning on the heaters pulls it right down, which is fine in the winter, but not OK during the summer.