So for weeks I thought my fan clutch was bad and that's why my 04 5.9 would over heat to temps at 226 when towing a 16' trailer with quads and in the freeway. So I bought the fan clutch from napa for $220 and a new 190 thermostat. Today in the morning I decided to only replace the thermostat and see what it would do. I took my truck out for a ride and seen my temp at 194 to 196 at idle. I jumped on the freeway and gave it all and still didn't see 200 in my temp :) I'm so happy the problem is gone and got my $220 bucks back from napa..... If you are having this same problem start by replacing the thermostat guys! Thanks.
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