We don't have a lot of Hummer H3 cooling system problems on file — feel free to add yours here. The most common H3 cooling system problems cost $500 to fix & occur at 67,000 miles. Click on a year below.

Worst Cooling System Problems
radiator cracked 2008 Hummer H3
leaking radiator 2007 Hummer H3
radiator leaks 2006 Hummer H3