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Auto Box High Temperature


Dougb
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Hi I wonder if any if any one can advise?

 

I have a Landcruiser 2010 auto box with 45,000 miles on the clock, recently I have had problems with the A/T high temperature light coming on when towing up long steep hills. The first time this happened was after I was behind a slow moving council wagon in Devon shortly afterwards the water pump was leaking and replaced the garage put the high Auto fluid temperature down to the pump not circulating the water efficiently. yesterday I was travelling back from Old Harley and came back over the blubber houses as I was reaching the top of the hill the A/T warning light came on as soon as the hill leveled off the light was no longer displayed.

 

Any thought would be welcomed

 

Regards

 

Doug

 

2016 Ssangyong Rexton EX 2. 2 auto & 2018 Bailey series 4 Pampalona.

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As the transmission cooler is in the bottom of the radiator is the viscous fan working correctly ? if it has one fitted.

Steve

2017 Dethleffs Globus I1 Motorhome.

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Were you towing at the time ? What gear were you in ? Did you have it in OD. ? If its in OD your tranny could be shifting up and down causing heat in the box. better with OD off then it will lock up in 3rd or 4th ( dont know if this LC is 3 or 4 speed auto ) When its in lock there is less heat generated.

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I thought somewhere, even on here I read that Landcruisers can't go wrong ;)

 

Seriously, this hints at the torque converter not locking up and slipping too much.

 

It ought to be beneficial to force it into a lower gear where the torque carried and slip was reduced, together with there being a greater flow to the cooler. However, it suggests there is a problem as these vehicles are specified for much higher ambient than met in the UK; a fluid change/flush would be high on my priorities.

Edited by JTQ
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Is the bottom of the radiator/oil cooler clear, and not clogged up with mud/dirt?

1958 Morris Minor towing 2012 Hobby Landhaus

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You're supposed to tow in '4' with an lc. At least according to the manual for my 2007.

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May be worth getting the auto fluid changed if it hasn't already been done.

Volvo XC90 D5 AWD, Lunar Ultima 615,Towing at 62%

 

You have a second chance at life it's called tomorrow!

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Basically you need to get it checked out for any memorised faults. (Solenoids, interface, control. pressures etc) If you have a dip stick (very doubtful these days) check the level and colouring of the oil. If you've checked all the other basics and for the cost, a fluid change is a good idea regardless, especially now its overheated.

 

Remember though, every time the transmission over heats, there's a good chance its damaging internal components, especially with oil degrading.

 

. .

Edited by Gaz40
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Basically you need to get it checked out for any memorised faults. (Solenoids, interface, control. pressures etc) If you have a dip stick (very doubtful these days) check the level and colouring of the oil. If you've checked all the other basics and for the cost, a fluid change is a good idea regardless, especially now its overheated.

 

Remember though, every time the transmission over heats, there's a good chance its damaging internal components, especially with oil degrading.

 

. .

car has been back to Toyota this morning no faults saved in the memory Fluid was checked and found to be Black instead of bright red. The fluid has been changed and the car drives much better now But I still have not been able to establish if the box has been damaged. I will have to think about what to do next.

 

Thanks for all your advice and help.

Edited by Dougb

2016 Ssangyong Rexton EX 2. 2 auto & 2018 Bailey series 4 Pampalona.

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If the fluid was black, I would call that a serious problem, the transmission fluid in an auto box is the life blood, degraded oil can destroy automatics, and believe me, they are not cheap to fix, consequently, a well looked after one will last the life of the car. Like most things on a Landcruiser, they are well built and are designed to be strong and operate in high temperatures. My advice is to get the fluid changed every few thousand miles or every couple of months until they can report it to be nice and clean. New oil is cherry red, in a good gearbox, the oil will stay cherry red for 10's of thousands of miles, so to be black is of great concern. This certainly needs further investigation, I would research a good auto box specialist, they are about, and go and talk to them.

Land Rover Discovery and Conquerer 630

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car has been back to Toyota this morning no faults saved in the memory Fluid was checked and found to be Black instead of bright red. The fluid has been changed and the car drives much better now But I still have not been able to establish if the box has been damaged. I will have to think about what to do next.

 

Thanks for all your advice and help.

Don't throw the towel in to early. Im a bit surpised there wasn't any memorised fault on the temp sensor circuit but this maybe a good sign.(what temp light came on ?)

 

If your gear change feels smooth with no periodic slipping or jolts on acceleration and de-acelleration. Hang on a while longer until your next tow.

 

If you have deep doubts . .. Trade it in or get a quote for an overall or exchange box. Only you can crunch the numbers to see if its worth it.

Edited by Gaz40
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It,ll be fine, a couple of wee overheats will have done no harm. Your car has only done 450000 miles. I personally drop out the transmission sump contents on mine at every service. It takes about 4. 5 litres to top up and keeps it fresh. No harm in you doing another change at your next service just to make sure its still fresh. You never said you identified a cause for the heating but Im going to bet you had o/d on and were hunting up and down gears. In lock up in any gear the amount of heat generated is not huge. You have no cause to be either alarmed or concerned and no need to go to any specialists for an expensive fix of something thats not broken. Do nothing as long as its driving fine and Im sure it,ll drive fine for another 250,000 miles or so.

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Depends on the temperature of the box and time span during the overheat.

 

If the oil condition was "black" was it black through being burnt or contaminated. (Possibly both) Tends to be more of a dark brown when burnt and you can instantly smell it.

 

If the oils burnt to a degree of being black, that's a lot over overheat and that will (On bake off terms), caralamise your internal bits.

 

If its contaminates, its possibly something breaking down. Alloys subjected to excessive friction tend to blacken oil.

 

But never say never and reinstate the basics, oil, strainer (if its replaceable) and fault codes removed and try it. "Lady luck" and all that.

 

Its seems todate the OP is noticing a better drive already with the oil change and no memorised faults (which is s good result) what it doesn't guarantee is a definite fix and longevity of the gearbox. So its a case of give it a chance but if a owner is going to constantly worry of a failure "is it worth it"

. .

Edited by Gaz40
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