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2006 chevy avalanche 1500 z71 the fan won't come on and we have replaced the sencers

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We have replaced the sencers but the fan will not come on please help

Vehicle: 2006 Chevrolet avalanche 1500

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P0480 or P0481 Cooling fan relay control circuit

Start by checking the cooling fan fuse, and replace both cooling fan relays. When the cooling fan is commanded on its ground signal is from the PCM. If the ground signal is not present from the PCM the PCM is faulty.

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