aux/ac relay problem, relay is fine relay box has the problem

[el_betillo]

my 89 jeep Comanche aux/ ac fan won't turn on.  first sign was when my truck started to over heat . I then bought a new aux relay put in the new aux relay turned on my ac, hoping it would fix the problem but it still won't turn on. only way it turns on if I use a green wire and connect to opposite sides but that makes stay on all the time ever after my ac is off and the truck is turned off . the problem started when i came back from the jeep runs/ tierra del sol event which is hosted every year and it gets realy dusty and a lot of loose dirt is in the air . could it be that dust got into fuse box cutting circuit?

 

[HOrnbrod]

On your 89 Renix the aux fan is triggered by the temp sensor in the radiator. Either the sensor is bad or you don't have continuity from the temp sensor to the aux relay.

 

Also your pic shows a 91 or 92 HO PDC (Power Distribution Center) jumpered aux fan relay, not an 89 Renix.