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04-20-2007, 07:44 PM
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Hummer Veteran
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Join Date: Oct 2003
Location: Bonita Springs, Florida
Posts: 33
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H2 running hot
I towed our camping tralier up to the mountains in NC and the transmission and engine gauge both ran just over the 210 degree mark on the gauge. Is this ok? I called my local hummer dealer to see if I could add a transmission cooler or anything that would help it run cooler and he said I was ok as the h2 has all that is needed. Any suggestions? thanks
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04-20-2007, 08:17 PM
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Hummer Professional
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Join Date: Nov 2005
Location: N.H. SEACOAST
Posts: 289
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Re: H2 running hot
what does the trailer weigh?
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04-21-2007, 09:16 PM
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Hummer Expert
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Join Date: Feb 2005
Location: The Great White North!
Posts: 527
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Re: H2 running hot
Get a bigger Rad, Tranny cooler and oil cooler, make sure you seperate the oil & tranny cooler from your rad, this way each component cools itself independantly from the rad. It will save you a ton of headaches years down the road!
Cheers!
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Last edited by MDimitri : 04-21-2007 at 09:19 PM.
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04-25-2007, 05:11 PM
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Hummer Veteran
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Join Date: Oct 2003
Location: Bonita Springs, Florida
Posts: 33
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Re: H2 running hot
the camping trailer weighs 4800 pounds
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04-25-2007, 06:27 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Re: H2 running hot
I had the same issue towing a similar weight trailer. I added the PML tranny pan, 180 degree thermostat, and Redline Water Wetter into the radiator. I also switched oil from dino to Mobil1 Synthetic.
The above seemed to have helped a noticable amount.
Other things to consider: changing out rear diff cover to PML cover. Also, replacing transfer case fluid with synthetic ATF. Front & rear diff fluid change to better syn fluids.
I plan on swapping gears to 4.56:1, adding slotted rotors and performance brake pads
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04-25-2007, 06:34 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Re: H2 running hot
BTW, as others have pointed out, the H2s seem to have an issue where we are at risk of the antifreeze and ATF getting mixed together from internal leaks. Doing what I suggested above over seperating the tranny and radiator still leaves you exposed to this risk.
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04-25-2007, 07:21 PM
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Hummer Guru
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Join Date: Nov 2002
Location: CSA
Posts: 2,511
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Re: H2 running hot
Quote:
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Originally Posted by tomp
I had the same issue towing a similar weight trailer. I added the PML tranny pan, 180 degree thermostat, and Redline Water Wetter into the radiator. I also switched oil from dino to Mobil1 Synthetic.
The above seemed to have helped a noticable amount.
Other things to consider: changing out rear diff cover to PML cover. Also, replacing transfer case fluid with synthetic ATF. Front & rear diff fluid change to better syn fluids.
I plan on swapping gears to 4.56:1, adding slotted rotors and performance brake pads
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Don't forget to get an alignment!  |
04-25-2007, 07:38 PM
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Hummer Messiah
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Join Date: Nov 2002
Location: PDX
Posts: 2,367,817
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Re: H2 running hot
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04-25-2007, 08:17 PM
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Hummer Messiah
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Join Date: Apr 2003
Location: Virginia Beach
Posts: 37,474
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Re: H2 running hot
Quote:
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Originally Posted by Klaus
Don't forget to get an alignment! |
__________________
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04-25-2007, 08:33 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Re: H2 running hot
Actually, I am glad you reminded me as I do happen to need another one 
Quote:
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Originally Posted by Klaus
Don't forget to get an alignment! |
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04-25-2007, 09:15 PM
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Hummer Messiah
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Join Date: Jan 2003
Location: ENRAGEMENT FOR HIRE
Posts: 31,286
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Re: H2 running hot
__________________
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