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Originally Posted by kaamacat  I did replace the HS relay along with the dual-temp radiator sensor switch, and no low speed. (Does anyone know if you can still do the override for the lowspeed from the sensor plug? The HS does override fine. |
A quick test for the low speed fan operation is to unplug the LS relay from the socket inside the fuse box. Get a gauge 18 stranded wire. Strip the insulation on both ends about 1/4 inch long to expose the copper strands. Insert one end on the relay socket at terminal 85. This bypasses the ecu and the radiator temperature switch. Reinstall the low speed relay on the socket. Turn the ignition switch to ON but do not start. Ground the other end of the jumper wire. The fan should run in low speed. If it does not, the low speed resistor in the fan is blown or open.