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Q: what is the typical engine temperature for a 2008 GMC Silverado Pickup Truck on 2008 Chevrolet Silverado 1500

cooling fan does not come on until temperature gauge hits 240 degrees, or if I turn AC on it will cool the running temperature to 210/220 Have had radiator replaced and dealer says this is normal.
What seems to make the problem better or worse? better when turn AC on.
How long have you had this problem? 4 months since I bought it
chevrolet, silverado 1500
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