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Old 06-17-2014, 08:11 PM
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WK2 trans cooler

with the 8sp auto how well do they handle the heat build up through extended sand driving (the Simpson Desert=800kms/1300 sand dunes) can a transmission cooler be added this would also help with caravan towing cheers
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Old 06-18-2014, 06:29 AM
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Re: WK2 trans cooler

If you post this in the Export section, more Aussies will see it - Export Grand Cherokee 2011+ - Jeep Garage - Jeep Forum
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Old 06-18-2014, 08:12 AM
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Re: WK2 trans cooler

This ZF transmission is designed to run at 194 F and will take 300 F and you can expect to see temps in the 250 F when driving in conditions you mention. If you add a cooler you will be bypassing the cooler that uses antifreeze to help maintain the correct temp. However if you NEVER see temps that require heating the transmission fluid (the reason the transmission fluid goes to the engine radiator is not just cooling but heating as well) then bypassing the rad and using an external oil cooler would be fine. All depends on your use and your warranty in OZ...
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Old 06-18-2014, 06:40 PM
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Re: WK2 trans cooler

re
This ZF transmission is designed to run at 194 F (90C) and will take 300 F (149C) and you can expect to see temps in the 250 F (121C)

Do you have any official Jeep or ZF data that ratifies that the transmission and oil will run at 300 F (149C) without damage?

I see a slow progression to a continuous 190F /88C over ~ 30 mins at 20 degC ambient under normal driving conditions.

This is ~ 65% on the temp scale, and 50% on the temp scale corresponds to ~ 60C and the transmission when warm is always above this level.

Garry
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Old 06-18-2014, 06:59 PM
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Re: WK2 trans cooler

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Old 06-18-2014, 09:35 PM
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Re: WK2 trans cooler

Tranny and oil temps were discussed in this thread. Note the Lifeguard8 specs

Transmission & Oil Temperatures
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Old 06-18-2014, 10:47 PM
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Re: WK2 trans cooler

Most external coolers are inline with the cooler in the radiator core. They are oil-to-air heat exchangers and are mildly effective compared to the heat exchange rate of the oil-to-water cooler in the radiator.

Since they do remove some heat and the GC Diesel has been shown to have a marginal cooling system when towing, I would say it can't hurt other than causing the ZF to reach temperature later. It would reduce the heat exchanged to the radiator and therefore increase cooling capacity IF the external cooler isn't located in front of the radiator. Is their room for an external cooler below or to sides the radiator?
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