The 1988 jeep cherokee comanche and wagoneer 40l engine series use an auxiliary fanthe auxiliary fan is controlled by a relay mounted on the left inner fender panel when coolant temperature is more than 190f 88c the radiator coolant temperature switch closes allowing current from the ignition switch to flow through the fan relay to ground activating the relay. Cooling fans are now controlled by the ecm through the respective module network and using duty cycle control signals here youll also be exposed to the current path voltage and sensor signal . Buy a 1988 jeep cherokee radiator at discount prices choose top quality brands apdi action crash csf gpd metrix nissens osc automotive spectra premium tyc. Jeep cherokee electric cooling fan diagnosis repair when coolant temperature is above 190f 88c the switch closes allowing current from the ignition switch to flow through the fan relay to ground activating the relay refer to wiring diagrams for circuit diagram check for battery voltage at terminal 2 of fan relay connector fig . Jeep cherokee xj 1984 2001 2 5l 4 cyl engine cooling system jeep cherokee xj 1984 2001 4 0l 6 cyl engine cooling system map imagemapresize
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