c6 tranny vacuum modulator

Clutch, transmission, rear axle

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Timd
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c6 tranny vacuum modulator

Post by Timd »

So I pulled my vacuum modulator and almost all my fluid drained out the hole, I don't believe this is normal? there was also some fluid in my modulator, is this normal?

Thanks
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windhamdw
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Re: c6 tranny vacuum modulator

Post by windhamdw »

i pulled the vacuum line off mine a few weeks ago and i had no fluid come, if that helps.
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Timd
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Re: c6 tranny vacuum modulator

Post by Timd »

Thanks

Did you have the truck lifted at an angle?
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windhamdw
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Re: c6 tranny vacuum modulator

Post by windhamdw »

no, it was setting on all four wheels.
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colnago
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Re: c6 tranny vacuum modulator

Post by colnago »

I had to pull my modulator off last fall. The tranny slowly dripped fluid out, but I doubt if it lost 1/4 cup over an hour. It was parked in my driveway, so at a slight incline. I don't remember if there was any fluid in the modulator itself.

Joseph

On edit, there was also a plunger of some sort inside the tranny, behind the modulator. While I had the modulator off, this plunger tried to "creep" out of the hole. Could you be missing this plunger, and that's why it drained the tranny of all its fluid?
Last edited by colnago on Tue Feb 21, 2017 2:47 pm, edited 1 time in total.
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Re: c6 tranny vacuum modulator

Post by Busboy »

If you have fluid leaking out of the modulator vacuum nipple then it is time for a new modulator.
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