Q: My 2005 yukon runs hot. It has a new thermostat, h2o pump, head gasket?
on 2005 GMC Yukon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Replaced old cylinder head as well. The engine coolant hot message comes on after about 20-25 minutes.
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(4) Comments
Maybe not!...... Suggest a combustion leak test. How about the radiator and cooling fan(s)? Try a scanner to see what the computer says the temp is, guage may be wrong.
There are no leaks anywhere, but I do recall not hearing fans on when I had to pull over
The COMBUSTION LEAK TEST is for CO (carbon monoxide) content in the coolong system, if the liquid used in this test changes color, you still have an internal engine problem. No doubt about it if this test is done right! If it is overheating at road speed (55mph) for say 5 miles, then cooling fans really dont come into play, however if overheating sitting still or slower speeds, fans may be a problem. Was it doing the 'same' thing before the work you did??
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