spaceman347

I know that overheaing an auto will kill it pretty quick but will over-cooling it cause any damage? I know that engines don't like running too cold how about transmissions?

I ask because I'm in Canberra an I've got a decent trans cooler on (it gets hot in summer), but I'm also driving around in winter when it's -2 with the same trans cooler, so the tansmission must be running pretty cool in winter.

redGhia

dont quote me but i dont think it matters. they still run tranny coolers on cars imported from overseas etc

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marcuss

Keep the standard radiator trans cooler and use it in conjunction with an external air/oil cooler. The radiator acts as an oil heater in very cold temps.

If you use an external cooler by itself the trans will run too cold with temps around zero.

spaceman347

Hmm, I've only go the external radiator type trans cooler to work with as I've replaced the radiator with a 4 core alloy job from Aussie Desert Coolers down in Melb somewhere (and it doesn't have any provisions for trans lines). Only had the radiator a couple of weeks and I had to bash the upper radiator support panel a little to fit it in but so far I'm very happy with it.

The point about the radiator acting as a trans fluid "heater" in really cold conditions sounds reasonable in that it would keep a little temp in the fluid as it passed through the radiator but I don't have that option.

xdc351

An auto temp guage might be the answer here.

Most auto's will heat up very quickly, especially with a high stall converter. I don't think even with the large cooler you'd have too much of a problem.

Either that or see if you can move the cooler behind the radiator, might help the temp stay a little higher.

Cheers,
Greg

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Warrawump

Hey Guys

I would be intresting to see what guys from places like canada and the cold parts of the us do about this. I live in the ACT and although it gets cold in winter, my trans seems to work o.k. I do give it time to warm up though before takeoff

Warra

redGhia

but wont your trans oil only warm up with the temp of the coolant, mine takes 5- 10 min before it is looking warm and the tranny should have warmed up by then.

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Advertising has come along way-----But still not far enough!!!!!
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Bugatti Veyron 16.4 ---- W 16 Configuration, Quad Turbo 1001 HP, 1250Nm, 4 Wheel Drive

Aussiblue

Good trans coolers (like the OEM Ford one that Ford Aus fit to Falcons etc) are designed with very fine passages so they only flow when the trans fluid is warm. To quote the Ford racing catalogue: " The self regulating design bypasses cold transmission fluid automatically (without thermostats or valves) until its viscosity decreases and allows flid to flow through the main body of the cooler."

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