Radiator Fan Not Coming On

1998 HONDA CIVIC
200,000 MILES • 4 CYL • 2WD • MANUAL
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JEREMY ABSHER
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  • 1 POST
the other day it started to overheat. The radiator fan is not coming on. With alligator clips I connected the radiator fan directly to the battery and it started immediately so I know its good.

Next, I checked the Cooling Fan Relay switch/fuse and it is good.

After watching some Youtube videos I thought it was the Radiator Coolant Fan Switch so I bought one from

(pictured here http://shop.advanceautoparts.com/p/carquest-by-bwd-coolant-fan-switch-tfs600p/18970366-P?

vehicleIdFromReq=39784&isAllVehicle=false&vehicleIdSearch=39784&searchTerm=tfs600p&showTitle=)
and replaced it. That did not work.

Now I am thinking it is the engine coolant temperature sensor. However, I cannot seem to be able to find where that is to replace it.

Can anyone help tell me where it is or do you think it is something else?
Jul 30, 2016 at 8:27 AM
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RIVERMIKERAT
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I would check continuity on the wires between everything. Start with checking for power to the fan and a good ground. Then work back. Here is an image showing sensor locations. I have also added the schematic for the cooling fan circuit.
Jun 22, 2019 at 3:06 PM