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#1 (permalink) Old 06-25-2011, 08:18 PM
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Heavy duty auto transmission cooler

Sometimes my auto gearbox will hold onto gears a lot longer than it would normally, and it actively resists my attempts of changing up manually, this occurs in either of the following two scenarios:
a) If I have been doing highway / freeway speeds (110km/h) for a period of time in excess of 30 minutes, then drop back into stationary or slower traffic (60 - 80km/h).
b) Sit in stationary or near stop start traffic for longer than 15 - 20 minutes.
The only way to recover from this symptom (that I have found to date) is to stop for 15-20 minutes.

The gearbox has been serviced ~ 15,000 km ago, and the Auto specialist shop didn't find any issues mechanically or diagnostically. That service did actually resolve some seemingly unrelated performance issues with the low speed cruising rev stability, but this issue has persisted.

Has anyone else encountered this issue?

I suspect that it is heat related so I am thinking about trying a heavy duty transmission cooler similar to Universal SuperCooler rated at 29,200 BTU 11"x11"x1-1/2" or Hi-Tek Automatic Transmission Cooling System 13-1/2"x9"x3-1/2" with 9-1/2" diameter fan

Anyone got any thoughts, suggestions or other recommendations to offer me?


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#2 (permalink) Old 06-26-2011, 07:46 AM
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Keep it simple first, Brett...
Why not try forcing more air thru the stock cooler? Maybe fit an elec fan or even encase it at the sides so air is directed to it more...
Gotta be worth a try before you spend silly money?
DAZ


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#3 (permalink) Old 06-26-2011, 09:08 AM
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I'll have to check what size the factory cooler is, and how I might go about mounting a fan over it. What do you suggest, just run the fan whenever the ignition is on, or some thermal control on it?


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#4 (permalink) Old 06-26-2011, 09:19 AM
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I would go for extra ducting to the cooler or mount a fan with a manual switch... But you must have an issue if the stock cooler is not performing.
Is there an alternative oil you could try?


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#5 (permalink) Old 07-20-2011, 12:33 AM
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If I had the same problem it means I have to first fix the stock cooler problem?
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