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| aftermarket transmission cooler thermal bypass, temp/brand? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=86718 |
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| Author: | tim_pato [ Tue Jun 13, 2017 8:56 am ] |
| Post subject: | aftermarket transmission cooler thermal bypass, temp/brand? |
i installed an aftermarket transmission cooler now looking at installing a thermal bypass. the one I'm looking at is tru-cool long brand 180° to install between the factory cooler and the trans cooler i installed. has anyone heard of this brand or can suggest a different one? |
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| Author: | papaindigo [ Tue Jun 13, 2017 9:59 am ] |
| Post subject: | Re: aftermarket transmission cooler thermal bypass, temp/bra |
The OEM cooler as far as I know has not thermal "bypass" nor does it have a line to bypass outflow back to the inflow line. I'm not a tranny person but I suspect the tranny does not circulate fluid to the cooler until a set temperature point (e.g. it has an internal thermal setting). |
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| Author: | tjkj2002 [ Tue Jun 13, 2017 10:05 am ] |
| Post subject: | Re: aftermarket transmission cooler thermal bypass, temp/bra |
I'd go to a much lower setting,like 140 degrees.If your wanting to wait till the fluid reaches 180 degrees before cooling,well that can be bad with a stand alone cooler that can't handle temp spikes very well. A few weeks ago I was in MOAB with a outside temps of 80-85 degrees and temps reaching 120+ degrees on the slick rock and my trans never went past 182 degrees,and I have the same trans as the CRD's do.Plus my KJ weighs 6400lbs and had the AC on and rarely reached speeds over 8-10mph on the trail,mostly at 5mph and less.Factory radiator,in radiator trans cooler that then loops to a 28,000GVWR AUX trans cooler before returning to the trans and no I don't have HD cooling,only the electric fan(3.7 gas KJ). |
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| Author: | tjkj2002 [ Tue Jun 13, 2017 10:06 am ] |
| Post subject: | Re: aftermarket transmission cooler thermal bypass, temp/bra |
papaindigo wrote: The OEM cooler as far as I know has not thermal "bypass" nor does it have a line to bypass outflow back to the inflow line. I'm not a tranny person but I suspect the tranny does not circulate fluid to the cooler until a set temperature point (e.g. it has an internal thermal setting). In any gear and "N" the trans is sending fluid through the cooler.The TCM will not let the trans shift into OD until the fluid reaches like 80 degrees or something like that.No bypass at all in the 45RFE/545RFE. |
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| Author: | user113 [ Thu Jun 15, 2017 12:09 am ] |
| Post subject: | Re: aftermarket transmission cooler thermal bypass, temp/bra |
tim_pato wrote: i installed an aftermarket transmission cooler now looking at installing a thermal bypass. the one I'm looking at is tru-cool long brand 180° to install between the factory cooler and the trans cooler i installed. has anyone heard of this brand or can suggest a different one? So...help me out here. Is your trans running too cool? Does your aftermarket cooler have its own fan? Is the fan thermostatically controlled? I would have figured that for anything beyond where the transmission is hot enough to engage 5th gear, cooler is better... |
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