subidoo Posted December 8, 2014 Share Posted December 8, 2014 Hello. I have 1992 legacy awd with an odd cooling fan issue. Here's the history When I got the car, the Passenger side fan had been hot wired to an ignition 'hot' in the fuse box. I got rid of that. Both cooling fans WILL come on with the a/c button. Fans do NOT come on when Coolant Temperature Sensor is unplugged. Neither come on with both black and green test connectors under dash, connected, as I read, should. Car WILL overheat if I don't turn on the a/c to get the fans running. I had a spare Temp Sensor, but this made no fix. I have checked all fuses and replaced the relays for the fans, both in the engine compartment fuse box and the main fan relay under the dash. I am stumped !!! Probably something simple being overlooked ??? Quote Link to comment Share on other sites More sharing options...
bluedotsnow Posted December 8, 2014 Share Posted December 8, 2014 my money is either on a partially blown fuze or more likely it sounds like part of your ecu went bad... if you can't get one from a local junk yard I might be able to help with that, there are lots of those cars around me at picknpull. alternatively have you checked all the wiring? voltage drop, impedance? Quote Link to comment Share on other sites More sharing options...
subidoo Posted December 8, 2014 Author Share Posted December 8, 2014 I actually have a spare ecu that I can try. As for the wiring, no I haven't checked anything more than connections and visual damage, etc. Thank you for your ideas! Quote Link to comment Share on other sites More sharing options...
subidoo Posted December 8, 2014 Author Share Posted December 8, 2014 Bummer, NOT the ECU. Will check fuses again Quote Link to comment Share on other sites More sharing options...
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