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  1. 91 4.3l Sonoma losing coolant - no visible leak

    Heating and Air Conditioning
    Alright here goes: Bought the truck about three weeks ago, drove 2h45 the night of purchase - never went above 58mph, temp gauge never rose above 140F. I've driven the truck a good few times about ten miles one way and the temp never rose above 140F. Yesterday I took the truck on an hour long...
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