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Volvo isx ac/fan system

My engine fan stays on all the time when my ac is on even if I hve it at the lowest speed. When I turn the ac off the fan will stay on for at least an hour, any help?

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I was having a similar problem with my Detroit S60 and they found the main wiring harness had a bunch of corroded wires in it. They replaced it and the problem went away.

Not sure what the other wires in the harness controlled as I hadn't really noticed anything else out of the ordinary on the truck but you could tell the wires were bad in multiple locations.

Like Kevin always says though, start with the batteries and make sure they're clean and have good connections then follow the wires back from there checking every ground and checking the wires for bad spots.

If you don't find anything on your own, I'd take it to a good electrical shop.

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Luis Poblete will be eternally grateful.
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