jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Transmission Cooler
Posted by Stevo78 - Moved from another thread
Hello Fellas
First off i would like to say how great this site is, without it i dont think i would of just purchased our xtrail, she is an 06 STS Extreme with 47,000Ks.
My question is reguarding automatic transmission coolers, i have spoken to some auto specialists some say fit it, other say dont need it, one of them said he wont do it because some transmissions require the oil to be hot to change gears and having a cooler and not towing will cause problems.
Then i rang nissan serviced and asked, i will be towing a boat 1200-1400kg
They said if its under 1500kg its not required, now i dont know who to beleive as the service guy also said my gearbox wont handle anything over 1500kg towing, when it rated for 2000kg?
So now im confused and i dont know which way to go. How many of you tow regularly without a cooler?
Most of my trips will be within 30km from home to the ramp with the occasional long trip.
HELPPPPP please
thanks
steve
Last edited by jalalski, 10/Nov/2008, 5:47 pm
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10/Nov/2008, 5:43 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Transmission Cooler
Steve,
You can fit the transmission cooler for added peace of mind, it won't do any damage if it's there, but in reality you have to weigh-up your options and see how frequently you drive around with the boat behind you xtrail and 1,200Kg is not a great deal of load to be causing that much stress to your transmission unless you're driving in hilly areas all the time.
The xtrail is over-rated when Nissan Australia mentioned the 2000Kg towing ability, we have seen evidence of chassis cracking when the xtrail is used to tow such heavy loads on frequent basis, some of this is directly attributed to the poor design of the genuine Nissan towbar, so to be on the safe side, never get to that limit if you don't want to discover long term problem further down the track.
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10/Nov/2008, 5:51 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Transmission Cooler
quote: Stevo78 wrote:
Is transmission damage cause by changing gears to reguarly? or does the oil heat up because of the extra weight your towing?
It's oil heat-up that causes AT failure:
quote: At elevated operating temperatures, ATF oxidizes, turns brown and takes on a smell like burnt toast. As heat destroys the fluid’s lubricating qualities and friction characteristics, varnish begins to form on internal parts (such as the valve body) which interferes with the operation of the transmission. If the temperature gets above 250 degrees F., rubber seals begin to harden, which leads to leaks and pressure losses. At higher temperatures the transmission begins to slip, which only aggravates overheating even more. Eventually the clutches burn out and the transmission calls it quits. The only way to repair the damage now is with an overhaul -- a job which can easily run upwards of $1500 on a late model front-wheel drive car.
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11/Nov/2008, 4:28 pm
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