Hummer H2 For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.

04 hummer 2 overheating?????

Old 03-20-2018, 05:03 PM
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Default 04 hummer 2 overheating?????

i have replaced the thermostat so, now where? Could it be the radiator clogged, should I back flush it? Also, the hummer doesn't have the trans cooler mod, is that something I should consider? Someone was saying to unclog the remote radiator tank???
Old 03-20-2018, 08:30 PM
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Join Date: Jul 2013
Location: Virginia
Posts: 407

The obvious thing to check is the coolant level. That will tell you if your radiator is leaking somewhere. Is the engine or trans overheating? Yes you should definitely put in a separate trans cooler. The oem radiator is a ticking time bomb to destroy your transmission when the fluids mix
Old 03-20-2018, 09:56 PM
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Ok, the trans temp gage is broken. I have checked the coolant numerous times and it hasent changed. Eng temp gage will go full hot if you keep going, I pulled over and turned the eng off. I checked the eng temp with an infrared temp checker and the gage is spot on! I guess I could check the trans temp with the infrared?
Old 03-21-2018, 07:58 AM
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Join Date: Feb 2008
Location: Kansas
Posts: 1,690

What's the mileage? If over 100,000 I would buy a new quality radiator.
Old 03-23-2018, 10:31 AM
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Location: Viera, FL
Posts: 255

It could be anything from a bad water pump, bad radiator or bad gauge.

Old 04-14-2018, 03:24 PM
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Join Date: Dec 2014
Location: Phoenix Az
Posts: 34

It could be something else. Mine started overheating and went in creep mode. I found out the catalectic converter had gone bad and the whole system was shutting down.
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