'87-89 4.9L Injector Blower
Unnecessary dead weight; the motor is prone to rust & seize, and the control relay/timer module (usually mounted on the passenger side behind the fan shroud) is prone to overheat. Either can cause a fire, so the system should be disabled & deleted. That's what Ford did around '90.
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Y/LB - hot at all times via Fuse 16
Gy/Y - hot in RUN
