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Discussion Starter #1
I haev an 86 Pulsar that all of a sudden has no cooling fan.
It has no A/C and only one fan.
The fan runs when bypassed from the electrical circuit and connected straight to the battery.
Did ohm meter test on the sending unit at the bottom radiator hose and it seems to check out. NO continuity when cold, Yes on continuity when hot.
Did search here and some mentioned blue relay by the battery. Not sure if that is the one or not. When relay is unplugged, I can jump it with jumper wire and make it click. There are 4 relays in the area there.

Is there another sensor somewhere that I am missing? Is the Air Temp Sensor in the air cleaner housing involved here?

Thanks
 

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Discussion Starter #4
Any one else have any ideas?
Is the blue relay by the battery the correct relay for the fan?
Are there more sensors involved in this system that I am missing?

thanks again
 

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On my car, The blue relay makes sort of a sparking/clicking sound, and I can see a light coming from inside it... Shortly after, the fan comes on. When the relay clicks again the fan turns off. This is the little blue relay by the battery
 
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