I have been looking at the Trans Cooler installs and don't see that anybody thought they needed one that has a fan. I am just wondering if a cooler with a thermostatically controlled fan would be over kill?

 

There were a few posts about people getting them with fans. The gist of their posts were that if you rock crawl, you will want the fan to move air across the tranny cooler. At crawling speeds the passives do little to cool as there is no airflow vs driving at highway speeds.

 

Regarding the additional coolers mounted in front of the OEM cooler: Wouldn't air be drawn through when the OEM radiator fan comes on? I think that's why people who have added a fanless cooler have seen such a good improvement in temps.

 

Yes it would, in fact I mounted my cooler where I thought it would get the most airflow when the fan does come on.

Unfortunately I spend most of my time on the road

But as I am still new to the Jeep myself, and have yet to take it on an extended offroad crawl, I don't know how often the fan would be running under those circumstances and thus not sure if there is enough consistent flow to do any good.

Others have mentioned the lack of cooling while crawling and switched to an active cooler. Wish I could remember which post it was.

 

Just an idea, not simpler to modify the thermometer to read both engine coolent and trans coolent temperature and have it start at worst case, I deem the air flows through both rads when the stock fan starts.

 

The transmission temp will start the fan, in addition to the engine temp.
So, if the engine temp is ok, and the tranny starts to get hot, the fan will come on to draw air through all the radiators.

 

Has anybody tried putting a fan on the stock trans cooler. Just wondering.

 

stock cooler is at the bottom section of the condenser, adding any sort of fan down there wouldn't be feasable. I installed a large (26,000 GVW) cooler in front of my condenser, been over a year, NO issues. NO engine temp effects, no a/c effects, just cooler tranny. Unless doing massively heavy towing or that type work with your JK a cooling fan is not necessary, a passive cooler will shed heat just fine with the SLIGHTEST amount of vehicle movement. A fan will increase the speed of heat transfer, not the transfer itself.

 

The stock cooler does have a fan. The same fan that cools the engine's radiator also cools the stock trans cooler since it cools the condenser as well. But that ain't enough, because the BONEHEADS at Chrysler designed the trans cooler inside something that gets hot as cat piss.

 

HOWS ABOUT GOING INTO THE CAT PISS A LITTLE DEEPER FOR US, THERE REDNECK....