Today I was getting ready to do the auto trans flush that I read about on this board, and now after speaking wuth a guy at the local trans shop I am having second thoughts.He informed me that I would fry my trans. I am sure that it is possible that he was just telling me this to get my buisness, but he sounded pretty convincing. Says it comes out faster than it can go in and that it would burn it up. But he also told me that for $100.00 he would do it. I have never taken any of my cars to a shop for anything, so I am very mechanical and very capable. so is he full of s--t or what? For those that don't know the procedure as I have read about on the board is that you disconnect the top line at the radiator, connect a hose to the line coming from the radiator, run it to a milk jug so you can keep track of the quantity and have someone start the car and as it is pumping out you are adding it into the dipstick tube.How could this fry it since there is still plenty of fluid on everything?

There is almost zero chance you will burn out the pump. You will be at idle and no load on the pump since the tranny will be in neutral.

The pump will stay lubricated adequately while you do your flush.

I've done the procedure with great results. I recommend draining/adding 2 qts. at a time. Better to be safe than sorry. Also, don't forget to put a little anti-sieze on the threaded nipple to make life easier next time you do this. Good luck.

Ryan

Yup, you got right, your "mechanic" is full of it. Now you must decide if you can trust his judgement on other topics? I too have done it on both my Volvos. Just shut her down while you top it up.

Hanyes (740) has the same prodecure but tells you to disconect it at the trany.

Tip, you can start the car from the drivers door, easier to watch for the bubbles.

No harm, I've seen or heard off. I've done it a couple times. Even ipd uses it.

Most mechanics are full of s--t.

Have done many, both AW and ZF and never have a problem, of course, I go two quarts per run so I don't run the trany dry. Follow the instructions. Check oil before starting to see if the trany fluid level is where it should be to start. I notice that at approx. 2 quarts I almost start seeing bubbles and no fluid---a good warning to shut her down. Note what the other have said.

dick

I have done this on six cars: you will not fry your tranny. The trick is to get a long, narrow funnel with a wide mouth so that you can put enough fluid into the tranny to match the output. It helps to have someone inside to turn off the engine if you can't keep up. Follow the FAQ instructions.

If you mark the receiving jug (or bucket) with a mark for every quart, you can tell if you're putting in the same amount that's coming out. If you think you aren't keeping up, do like Randy said and just shut off the engine until you "catch up". Personally, I think if you have a decent size funnel on the filler tube, and the engine is just idling, you won't have a problem.

I believe that you attach the hose to the threaded nipple on the radiator after you remove the top line to the transmission.

Yes, it comes out faster than you can pour it in. I use clear plastic hose so as it is pumping out I can see when it is running out of fluid by all the air bubbles that form in the hose. At that point you turn off the engine and add the quantity of fluid that has been discharged into the container. Start the engine again and let it pump until air shows in the tubing. Turn it off, add fluid, etc. I pump out 6 or seven quarts. Reattach the line and carefully top up the fluid. Take the car for a drive and then check it when you get back and bring it to the full "hot" mark if necessary. I also take the car for a drive before the exchange of fluid so I can flush it hot.

You can certainly find something more fun to do with your $100.

Randy