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My "90" overheated the other day ,the fans were not running! I wired them direct with a fuse ,to make it home,but would like to know where the sensor is that controls the fans to come on ! I couldn"t find anything in the FSM . THANKS

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There’s also 3 underhood relays to turn the fans on. They are in the relay center on the drivers side fender. Both fans should come on low when ac is selected. Then they should go to hi as conditions dictate. I can’t remember for sure, but I think there is one relay that turns both fans on low (when the ac is turned on) and then there are two more relays that will each turn one of the fans to hi. I replaced all 3 on my 90 and they work as described. Sometimes just unplugging and plugging together a couple of times will clean the contacts enough that they work ok. How this helps. 
 

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88 had to, 89 up had three, Allante had a module.

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