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Working on a 2007 3.5L G6 auto. The transmission cooler lines were rusted and leaking. A quart of fluid was added because the transmission "felt weird". I don't know how long it'd been leaking before this quart was added (family member's car), but I assume it was leaking for a while. A few days later, I changed the rusted lines. I looked around to see if the fluid check method was the normal GM procedure, and it seems like it is, but correct me if I'm wrong here -

vehicle to/near operating temp
with car level, engine running, run through the gears, then remove the check plug
add fluid through fill port until fluid seeps from check plug hole

The issue is that when I did this, fluid came flooding out of the hole. I don't know much I lost, but it was a good 4-5 seconds before I was able to get back to the keys to shut the engine off.

I added some fluid I had sitting around, and this time just cracked the plug open instead of taking it out, and fluid was still steady seeping out. I shut the motor down, and let the "excess" continue to seep out until it stopped. I drove the car down the street, and it felt fine, but when I drove it again a bit later, cold, it slipped for a bit, then drove normally 5 minutes later. I assume the fluid level is not correct.

Am I checking the fluid level correctly? I want to get this thing out of my garage, but I just can't seem to figure out how to properly check the level to get it sorted.

Thanks!
 

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If the fluids leaking out of the plug hole there is too much in there.
So from empty, pull plug, then fill until fluid pours out of plug hole.
put in plug, run engine to regular temp, cycle through gears, and while engine is still running, pull the plug...at that point there should be nothing coming out. Then start filling through top until fluid pours out of plug hole. then cap both and you're done.

So it sounds like there was too much fluid in there to begin with, and you just need to drain out the excess.
 

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Discussion Starter #3
That was my thought as well, but if it were leaking for potentially weeks, and only a quart was added, I wouldn't expect fluid to come out of the plug hole like a dam let loose.

I'll put the car up on stands later, let it get warm, run through the gears, and crack open the plug again. I don't want to take it out entirely from fear of having to clean a ton of fluid off of my floor again, but I'll let it seep out again and see if it eventually stops.

Thanks for the reply.
 

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Discussion Starter #4
Update:

Did this again, and with the plug out, the fluid was "spurting" out, like it was pressurized. Eventually, it slowed down to a drip, so I thought maybe it leveled off. Plugged it back up, shut the engine off, took it off the stands, went to back it out of the garage, and it was revving to ~2.5k RPM before engaging and moving.

I pulled it back in today, let it warm up a bit, pulled the plug, and it was spurting again.

Any idea what would cause this to act pressurized like this? I assume the fluid is still too low/high, but with it acting like this I have no idea how to proceed.
 

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Discussion Starter #5
Welp, I'm a dummy. I thought the check plug for the fill level was the plug on the "front" of the case, right near the trans cooler lines. That's incorrect. That port is for internal pressure testing (which would explain the pulsing bursts of fluid I suppose :smile2:) The correct port is near the passenger axle. I had to add a bunch of fluid, but I got it sorted and driving/shifting normally.
 

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I’m new to the G6. Just bought a 2007 and want to check the tranny fluid and don’t see a normal dip stick. From reading BTE’s post it’s a plug near the passenger axle. I’m assuming that it’s visible from the top side. Am I right?
 
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