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#1
03-16-2009, 02:12 PM
Hummer Expert
Join Date: Jun 2008
Location: New York
Posts: 524
Transmission Temperature
On the highway out of Langtry, TX yesterday I noticed my transmission temperature was running a needlewidth over 200 (205?). It was 86 degrees outside and I was runnning 80 mph on the highway after a wonderful weekend in Big Bend National Park. I've never seen it over 200 unless I was wheeling in 4 low. I know it goes in the self protection mode above 240, but I'd never seen it over 200 before, perhaps I never looked while on the higway in the summer. Anybody else seen the transmission temp at 200 on the highway before?
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#2
03-17-2009, 01:51 PM
Hummer Authority
Join Date: Jun 2005
Location: Key Largo
Posts: 1,174
Re: Transmission Temperature
Sounds to me like your transmission is running at the same temperature as your radiator coolant. The only vehicle I've ever owned with a transmission temperature guage was a surplus army DUCK from WWII and looking at my old pictures - the green band was 210F to 310F. Maybe that's why they took that gauge out on the '08 and '09 H2, so you wouldn't watch it!
Last edited by HummerJim : 03-17-2009 at 02:01 PM.
#3
03-17-2009, 03:42 PM
Hummer Expert
Join Date: Oct 2005
Location: MARYLAND
Posts: 779
Re: Transmission Temperature
DO stock trans cooler by-pass search it
#4
03-17-2009, 04:13 PM
Hummer Veteran
Join Date: Jan 2009
Posts: 55
Re: Transmission Temperature
mine has crossed 200 by a hair going up the baker grade on the way to vegas....never went above that and went down to normal area as soon as i hit the downside.
#5
03-17-2009, 05:03 PM
Hummer Expert
Join Date: Jun 2008
Location: New York
Posts: 524
Re: Transmission Temperature
Talked with the dealer and they told me 180 to 210 is the normal operating range for summer on the highway with an H2.
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#6
03-18-2009, 05:09 PM
Hummer Guru
Join Date: Jan 2005
Location: Oregon
Posts: 4,321
Re: Transmission Temperature
Shouldn't be a problem. Mine heats up all the time when I'm pulling hills in warm weather. If it ever got to the red it would be bad, but it hasn't. (In my H2 of course)
86 degrees out?! That really sounds nice right now.......
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