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5 min of idling, I am just getting to 120 and that's on a hot day. If he is getting to 240 or more in 5 minutes Its more then a cooling issue. That sounds like the water pump is shot, the radiator or something is impeding the flow of coolant as there isn't any circulation. But still the fan...

Kascar or the hummer guy. Sent from my SM-J727U using Tapatalk

I wouldnt recommend that either unless you dont need your fingers. I get the concept all you really need to do is apply some resistance to the fan. If fan cluch is not engaged it will slow down. Don't use your fingers or 2 by 4. Just some thing that will provide resistance. Sent from my...

I was thinking the same thing. Thermostat needs to be replaced. Ensure that you by the Hummve specific high flow one. Also nothing wrong with disconnecting the TDM as part of trouble shooting. If fan turns on then TDM or Thermostatic fan switch are bad. otherwise it's the Thermostat Sent from...