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My truck has the same problem as described here. Did not start the overheating till after the second timing chain replacement. Towed a 24ft car trailer over 18,000 miles and never got a high temp. Now towing the trailer empty the temp stay up on the 230-235 range half the time.

The dealer change the water pump and thermostat and on the way home I got the temp spike again. Going back to the dealer again for this.
 
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