Cooling Fan Runs Continuously
- Turn ignition off. Disconnect low cooling fan relay. Relay is mounted on radiator cowl support. Connect a jumper wire between positive battery terminal and Black/White wire terminal and Red wire terminal at low cooling fan relay. Connect negative lead of voltmeter to negative battery terminal. Measure voltage at Blue/Yellow wire terminal at low cooling fan relay. Connect another jumper wire between ground and Red/White wire terminal at low cooling fan relay. Again, measure voltage at Blue/Yellow wire terminal. If voltage is more than 10 volts with ground applied and less than 1 volt with ground not applied (relay is okay), go to next step. If voltage is not as specified, replace relay.
- Turn ignition off. Disconnect high cooling fan relay. Relay is mounted on radiator cowl support. Connect a jumper wire between positive battery terminal and Black/Red wire terminal and Black/White wire terminal on high cooling fan relay. Connect negative lead of voltmeter to negative battery terminal. Measure voltage at Red wire terminal at high cooling fan relay. Connect another jumper wire between ground and Blue/Green wire terminal at high cooling fan relay. Measure voltage at Blue/Black wire terminal on relay. If voltage is more than 10 volts at Red wire terminal with ground not applied and more than 10 volts at Blue/Black wire terminal with ground applied (relay is okay), check Powertrain Control Module (PCM) cooling fan circuits. See the TESTS W/CODES - EEC (2.5L) article in the ENGINE PERFORMANCE section. If voltage is not as specified, replace relay.