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Right behind the battery, under the hood is a fuse box. In the fuse box there are two black relays. One is the headlamp driver module and the other is the cooling fan relay. They are right next to each other. I am not 100% sure which is which, but unplug them and put one in at a time and you will find out quick which one is the cooling fan relay. I had a bad headlamp driver module so I switched them to find it.

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13y ago
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Q: Location of cooling fan relay on 2005 Trailblazer?
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