Aux Transmission Cooler with Fan - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 8 Old 07-26-2010, 06:13 PM Thread Starter
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Aux Transmission Cooler with Fan

I just finifhed testing the B&M 70298 Hi-Tek SuperCooler Oil Cooler with Fan after installing it on Saturday. Last week we had to turn back on a trail because the transmission over heating alarm kept going off. After installing the B&M, we ran it all the way with no problems at all. The fan never even came on (I know it works, we tested it). Ambient was higher this weekend than last and we carried more gear also.

It's a real tight fit but with the examples showing how other here did the work, it was no problem. I'm not sure the fan is needed. If I was to do it again, I might go with the model that does not have the fan.

Well anyway, I recommend this mod to anyone with the JK slush box. Thanks so much to all who took the time to post photos and details of their installation. No point in my doing it as well as I could not improve on what is already posted here.


2008 Rubicon, 4 door Detonator yellow, 3.5" lift, Motech LS 6L engine conversion, RR Skids.
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post #2 of 8 Old 07-26-2010, 06:55 PM
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Nice, do you think this would do a good job as a stand alone unit?
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post #3 of 8 Old 07-26-2010, 07:31 PM Thread Starter
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If by stand alone you mean not using the stock on at all and just using the B&M I would not hazard a guess. I don't see any benefit in bypassing the stock one. What do you have in mind?

2008 Rubicon, 4 door Detonator yellow, 3.5" lift, Motech LS 6L engine conversion, RR Skids.
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post #4 of 8 Old 07-26-2010, 09:03 PM
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I don't currently have an auto, but getting ready to swap one in.
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post #5 of 8 Old 07-27-2010, 08:16 AM
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Quote:
Originally Posted by Rubydak View Post

I'm not sure the fan is needed. If I was to do it again, I might go with the model that does not have the fan.

That is kind of what I was thinking. After reading everybody's experiences, I determined that a fan is "probably" not necessary. I ordered the 70268 which is 3/4". So if I find it doesn't adequately cool the tranny oil, I can always add a Spal pusher fan to the front.
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post #6 of 8 Old 07-27-2010, 08:26 AM
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Althought I'm running a hemi, I can offer you some insight. I'm running an aftermarket cooler on my rig. I am NOT using the stock cooler for the transmission. I converted that to cool the power steering.

My temps are 150-160's going down the freeway at 75mph. On the trail, it will go 170-180's. I think you could safely use the aftermarket cooler on its own and use the stock cooler for your power steering.
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post #7 of 8 Old 07-28-2010, 12:16 AM Thread Starter
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[QUOTE=thebigtman;493723]Althought I'm running a hemi, I can offer you some insight. I'm running an aftermarket cooler on my rig. I am NOT using the stock cooler for the transmission. I converted that to cool the power steering.
QUOTE]

Do you have any details on how to do this mod? I'm interested.

2008 Rubicon, 4 door Detonator yellow, 3.5" lift, Motech LS 6L engine conversion, RR Skids.
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post #8 of 8 Old 07-28-2010, 06:18 AM
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It's really quite simple. Route your transmission lines to the aftermarket cooler. You can cut the ends off of the lines, flare them and use double hose clamps to secure it or you could find a barbed connector that would work. After you've successfully routed the transmission lines, take the power steering return line (low pressure hose) and route that to one side of the factory trans cooler, which is incorporated into the a/c condenser. Obviously then you'd take the unused port on the condensor/factory trans cooler and route that back to the power steering pump. They both use the same fluid so there's no need to flush anything unless you suspect a problem with either the PS or transmission.

If you're going to run in the rocks with big tires or plan to run a hydraulic steering setup, this is the easiest way to keep your pump cool. Once you stick your head in there, you'll see how it all comes together. Make sure you leave enough hard line on the connecting block that comes out of the factory trans/condenser. This will allow you to put a flare on it and connect it up to the power steering line with no leaks. Either flare the connectors or rig up a barbed connection. I put a slight flare on mine and used double clamps. These are relatively low pressure lines so you will be fine.
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