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87-89 Ford 4.9L fuel-rail-mounted fan temperature switch with co…

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Chrome bumper bracket resting on a vehicle roof in a salvage yard

Orange Ford Ranger F250 truck door with chrome mirror in a junkyard

Open tan center console storage compartment between two cloth seats

Disassembled vehicle dash wiring harness laid out and labeled with connector functions

Dusty engine bay of a vehicle with red hood

Dusty engine compartment showing A/C compressor and components

Swingaway spare tire carrier components with labeled U-bolt, L-bar, J-bolt and strike

Engine bay showing auxiliary battery connector and continuous-duty relay location with labels

Dirty engine compartment view of alternator, pulley and belt

Labeled diagram of 1980-86 truck cab roof and headliner differences

Severely burned engine exhaust valve with eroded, pitted head

Aluminum-cased transfer case or differential resting on cardboard

Comparison of black Ford warning chime modules WCMs from 1992 to 1995

Four views of a Borg-Warner 1345 transfer case on gravel

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Injector Cooling Fan Switch (170 degF) for '87-89 4.9L only
STEMCO 431-5040 F170 89019A

Below 170degreesF, it's open (OFF); above, it's closed (ON). Neither wire is connected to the brass face (NOT grounded), but it can be wired up that way if necessary.

The injector blower motor is powered by the relay for a maximum of 15 minutes when the ignition switch is OFF and the temperature switch is closed. The injector blower relay will disable the motor if the temperature switch goes open (cool) or if the ig.sw. is turned to RUN. Test the relay & motor operation by turning the key OFF and grounding circuit 743 Bk/LB; the motor should run for approximately 15 minutes, and then stop.

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