Radiator Fan Not Coming On

JEREMY ABSHER

MEMBER
1998 HONDA CIVIC
4 CYL
2WD
MANUAL
200,000 MILES

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?

1 Reply

RIVERMIKERAT

MECHANIC
6,110 POSTS

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.

Image (Click to make bigger)