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The Fans run in series for low speed operation with half the voltage across each fan motor. Then in high speed they get switched to a parallel configuration with 12 volts across each fan. Here's a wiring diagram:


For low speed operation relay 45 is triggered putting the fans is series through relay 45's normal position. Then when high speed mode is needed both relay 43 and 45 are triggered. Relay 44 ground's the left fan and relay 43 provides the 12 volts for the right fan which already has a ground connection. Check the 3 fuses 14, 46 & 49 in the Engine Compartment fuse box as well as the 3 relays 43, 44 &45 and ground point G102 if you are having problems with the fan operation.

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