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+--- Thread: Over-Cooling? (/showthread.php?tid=6834)
Over-Cooling? - CRD4x4 - 10-22-2015
Hi fine folks!
My Jeep (2.8L CRD/auto) has started to slowly drip atf on my driveway so I decided to add a remote trans cooler and replace the leaky lines.
I like to upgrade whenever possible so I hopped on that internet & found a nice looking cooler that had a 5-star rating and 75% off sale.
When the box arrived I joked that it couldn't be my cooler because it was huge - well I bought a roughly 2 foot × 1.5 foot (do your own conversions) 31 row flat plate monster that is clearly too big...
...or is it??
I do a little towing but never more than a few thousand pounds and I don't take it mudding or anything like that - it's my daily driver and grocery getter so my questions is:
Could I do any harm to my transmission (545RFE with Suncoast TC) by over cooling it?
The temperature where I live ranges from subzero to 110 degrees F ambient.
All replies are welcome even it it's conjecture or hearsay.
RE: Over-Cooling? - MFSuper90 - 10-22-2015
My thought is it depends on how much it cools it I guess. If it never gets within the proper operating range then that wouldn't be good for the trans I don't imagine.
What about a thermostat?
So it only opens to cooling above minimum operating temperature
RE: Over-Cooling? - raysorenson - 10-22-2015
I was under the impression that auto transmissions come with thermostats. Even so, I'd be a little worried about driving in sub-zero weather.
RE: Over-Cooling? - MFSuper90 - 11-01-2015
(10-22-2015, 09:48 PM)raysorenson I was under the impression that auto transmissions come with thermostats. Even so, I'd be a little worried about driving in sub-zero weather.
That would make sense if they came with their own t stats
RE: Over-Cooling? - Tito - 11-01-2015
I placed my remote trans cooler near the head light so it doesn't catch cold air al the time, but I fitted a small fan that switches on and it's able to draw air past the bumper and fender etc. so no overcooling but good cool capacity when needed. And no cooling losses on the engine (big bonus on an std).
RE: Over-Cooling? - kestreltom - 11-03-2015
(10-22-2015, 07:28 AM)CRD4x4 When the box arrived I joked that it couldn't be my cooler because it was huge - well I bought a roughly 2 foot × 1.5 foot (do your own conversions) 31 row flat plate monster that is clearly too big...
...or is it??
I don't know about the Jeep tranny... but that cooler does sound rather large. A thermostat controlled fan would help. My '84 300D is set up with a remote trans cooler / fan / thermostat over the rf wheel well and it works great! The thermostat is set to keep the fluid in the 150 - 160F range.
![[Image: zCPESbjPWTgMTgVEAKtAGh6vYV2H9E10CM_y8GNc...88-h511-no]](https://lh3.googleusercontent.com/zCPESbjPWTgMTgVEAKtAGh6vYV2H9E10CM_y8GNcAkpiPtRAhF3Ii6Kqkp8m-2dRgqeYKAH2Rm5xjq6N5i90_g48II-b3f7KiZEOnqxuR-NCpaX_Z9afQcF7DiSzM1BK5Y0_RtgRqWFo8w4LgDpxTDKtYLG41v_kJkE5ZOJe3Lzx1M9FkKeSZn_7vKWT-Mqcr5h23V2LHv8ZEEk6y9wX7rqK10DU6XoDnRdoVZANRWQEQ4JlZ1vT9-MC5JVNoseCepGQB7D423kz3YYUdgCGgX3QMvXm0R6usPSdkSiq-OlJobOHlK6E5ma5X7SS3yGzZ3QFJneydXU1Ofz4oi7cYgUMWA8NDtPjYr-IGxVznIidrCTKManKNxb9UYye59nwGYSfxKB9lNNux_2_NiSaCgAZJ8wmmcXF0S7Y5fW6pHRcHAwqQrWSkPhoJ3PKy6VPixC_sjF6WBZ8n07fahIwe0O2It81LgaxlNiDe8_sGBqN4WfCy1jALwRmBJaBn3CqG_pPZfW6QNgyUee6PsTauzkxvTAdHc5UsKbhB8wqeS8=w288-h511-no)
RE: Over-Cooling? - Hario' - 11-10-2015
my understanding is the there is no minimum running temperature for atf, unlike gear and engine oil, so the cooler the better. But I agree sub-zero sounds like bad news.
RE: Over-Cooling? - MFSuper90 - 11-13-2015
(11-10-2015, 11:58 AM)Hario my understanding is the there is no minimum running temperature for atf, unlike gear and engine oil, so the cooler the better. But I agree sub-zero sounds like bad news.
I do know that in Alaska and other very cold regions they have heater pads that stick to their transmission pans and they plug them in the same as a block heater.
RE: Over-Cooling? - Grecy - 11-15-2015
(11-13-2015, 05:38 PM)MFSuper90 I do know that in Alaska and other very cold regions they have heater pads that stick to their transmission pans and they plug them in the same as a block heater.
In the North we heating pads on the oil pan, a blanket on or under the battery and a block heater.
It's not common to put a heating pad on the transmission directly, though I'm sure people do it from time to time.
These plug-in heaters are only used to warm the vehicle before it is started. Once the engine is running (and driving), it's not used.
I'm in the Yukon, the capital of Alaska is 9 hours directly South
-Dan