Check the fan relay.Or the fan motor.Check the voltages of the fan relay and fan motor.It should show exact 12 volt.
This will indicate the exact fault.
Check the fuse for the fan and relay. Remove the fan fuse under the dash. Open the fuse box by turning the knob on the fuse panel cover counterclockwise and pulling the fuse panel down.
Unplug the lead wires running from the fan to the fan's relay. There are two leads running off the fan -- a power lead, and a ground lead. The ground lead will always be black. The wires run to a relay switch, which looks like a small black box. Pull the leads off the relay switch.
Touch the red or power lead to the positive terminal of the battery directly. Then, touch the negative lead from the fan to the negative terminal on the battery. Always connect the negative lead last and remove it first from the battery. Make sure that you are not touching the battery directly or that you are not touching any exposed wiring. Hold the fan wiring by the protective plastic coating. If the fan starts, the fan relay is not the problem. If it does not start, the fan motor/and relay has failed.
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