Flushing the Transmission! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-07-2003, 07:54 AM   #1
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Default Flushing the Transmission!

I was told you could unhook the tranny line from the radiator, start the car, and let it run..catch the old tranny fluid, while pouring in the new..and let it run till it runs clean!

Anyone know which line it is on my 94 se?

And has anyone ever done it?

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Old 11-07-2003, 09:17 AM   #2
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I recommend a Machine method due to you will suck AIR into the system this way. Air will cause the remainding fluid to FOAM as it enters the system.
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Old 11-07-2003, 11:24 AM   #3
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dont do a flush....just change the fluid....also change the filter....
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Old 11-07-2003, 11:33 AM   #4
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I did it by taking off the line couple of months ago. Because you likely can't add as quickly as it comes out, I would add, start the car, let it run and then shut off before it goes dry and top off again. Worked without a problem, but I went through about 15-16 liters.

I'd recommend this over only a pan drop and filter change as it gets rid of all the dirty oil (and not just about 30%). I think it was the upper transmission line that goes into the rad (I didn't disconnect it there, but underneath the engine near the front of the car).
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Old 11-07-2003, 12:35 PM   #5
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I'm no expert, so dont take my advise to heart, but heres what I do to determine whether or not I am willing to pay for a flush. Look at the fluid, If its really dirty and or kinda burnt looking,or just has a look to it that you know every little bit of that stuff needs our of there, I would get it flushed. If Its just kinda old looking, lost some color, that sort of thing then a change will do the trick. I recoment Valvoline MaxLife fluid, its well worth the money.Mine shifts like a dream with MaxLife. As for getting a flush done, if you must I would take it to a shop to have it done, less chance of any transmission damage from doing anything wrong that way.
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Old 11-07-2003, 10:06 PM   #6
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but the flush doesnt change the filter...you flush it and it goes through taht dirty filter again its gunan get dirty
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Old 11-08-2003, 04:09 AM   #7
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well with a flush, you dont change the so called "filter". if you look at our filter, its nothing more than a nylon screen. when it stops crap and you shut off your car, it falls to the bottom of the pan. everyone i have ever changed, the screen was clean and the crap was laying on the bottom of the pan. a flush will change 99% of the fluid that is in the tran, including the converter.
i stongly recommend taking it to a shop and have the machine hooked up to it to have it done
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Old 11-08-2003, 07:37 AM   #8
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Thanks for the replies...I got my filter yesterday but it is not a screen..it is a funny shaped metal thing...I have a 94 is that the wrong filter?

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Old 11-08-2003, 07:42 AM   #9
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No, prob'ly not. It should look like a thin metal "box" with a plastice tube sticking up out of it. The screen is inside that.
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Old 11-08-2003, 07:48 AM   #10
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Thanks for the quick response..glad i got the right one..I was planning on doing this one early
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