Electric fans are run by a temp switch which trigger a relay to run the fans. These systems have fuses also. Of course over time the electric fans bearings go bad, they won't spin. Simple test, spin it by hand, spins? Bearings OK. You are left with an electrical issue.
On my cars I have found problems with all the above. Bad bearings will cause the fuses to blow and cause high amp draw on relay which chars the contacts. So everything ends up needing fixing.
If you want to DIY I suggest you buy a repair manual. Electrical troubleshooting is complicated, Good luck!
With
mechanical fans, most overheating problems are caused by
a faulty fan clutch - though a missing fan shroud can reduce the fan’s
cooling
effectiveness by as much as 50 percent (depending on the fan’s distance
from the
radiator), which may be enough to cause the engine to overheat in hot
weather or
when working hard.
Defective
fan clutches are a common and often overlooked cause of
overheating. The shear characteristics of the clutch fluid gradually
deteriorates over time, with an average loss in drive efficiency of
about 200
rpm per year. Eventually slippage reaches the point where effective
cooling is
no longer possible and overheating results. (On average, the life of a
fan
clutch is about the same as a water pump. If one needs to be replaced,
the other
usually does too.)
If
the fan clutch shows signs of fluid leakage (oily streaks radiating
outward from the hub of the clutch), spins freely with little or no
resistance
when the engine is off or wobbles when the fan is pushed in or out, it
needs to
be replaced.
With
an electric cooling fan, check to see that the fan cycles on when the
engine gets hot and when the air conditioner is on. If the fan fails to
come on,
check the fan motor wiring connections, relay and temperature sensor.
Try
jumping the fan directly to the battery. If it runs, the problem is in
the
wiring, relay or sensor. If it fails to run, the fan motor is bad and
needs
replaced.
Hope help with this.
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