auto gearbox problem????

[K.T.]

hi,
when towing my caravan with my ml270 cdi auto, if i go up a fairly steep hill the engine temp goes up slightly and as the gearbox changes down i find that after it drops a couple of gears the engine seems to be revving and there is a lack of drive, if i take my foot off for a couple of secs and then put it back down it seems to be ok at a slower pace. can anybody help with this problem????? thanks

 

[Miffy]

firsst thing to check is your ATF levels, low atf will cause a feeling similar to a manual clutch slip

 

[K.T.]

hi,
thanks for that. the levels were checked last week and were fine,what now???

 

[Xtractorfan]

Has the oil and filter been changed recently, It would do no harm to have the codes read on a star disgnostic as you may have a few stored faults

 

[television]

Hello and welcome,, I cant recall reading a post like this before, and not with an ML,,I think that I would find a good indie and see if any codes are recorded

 

[K.T.]

hi,
thanks for quick replies. has been checked and no faults recorded but have not changed oil and filter,have only had car 3 months and don't know when this was last done.
the car has done 125k in total.
do you think oil and filter change is the solution then??
thanks

 

[television]

As the fluid should be changed at every 40k miles, and it is never done on a service, then it could solve all of your problems.

A good indie will change the fluid and filter for around £165

 

[K.T.]

thanks for that. what's your opinion on doing this myself,is it a hard task??

 

[television]

thanks for that. what's your opinion on doing this myself,is it a hard task??

No it is not hard but things must be kept very clean,, if the car is before 09-99 you may have a drain plug , but you probably will not have one. So to drain it all the oil cooler pipe will have to be disconnected and the engine spun for a few seconds to get it all out, if you do not do this, you will only change 3 liters out of the 7 in the box.

This is the same box

http://forums.mercedesclub.org.uk/showthread.php?t=25566

and so is this

http://www.peachparts.com/Wikka/Trans7226Fluid

 

[K.T.]

thanks ever so much for that and the links are a great help, i think i will give it a go with the help of a mate who plays with cars constantly.
will let you know the result.
thanks again.