Hummer h3 overheating

What is your question?

My 2006 keeps overheating. The gauge almost reaches the 3/4 line while It’s idle like at a red light, but temperature goes down as soon as I start to drive. I changed the sensor, thermostat, water pump , radiator, fan clutch and it’s still overheating doing that. What else could it be?

What makes this problem better or worse?

Temperature gets worse when Hummer is idle, like at a red light.

How long has your 2006 Hummer H3 had this problem?

1 week