So I had a coolant leak not a major one, I was told by my mechanic that I could use stop leak. Well I thought I had put it into the radiator but while driving down the road my car stopped working I pulled off and popped my hood and that’s when I realized I put it into the transmission fluid! The cap…

I am very aware that it’s not good :woman_facepalming:t2: I was hoping maybe it could be flushed out… the way GMC has designed the placement and and symbols for the two caps made it easy to mistaken one for the other… but I do know I should have been far more careful

Are you sure you put it in the transmission? I’ve NEVER seen a transmission fill point that would be easy enough to add fluid without a funnel, or that has a cap that could be confused with coolant. Picture please.

So the cap was dirty and the only thing that I saw was the part of the symbol and the dex which I since the second part had been worn out I thought it said dex cool which Is what I put in for coolant … the picture is the transmission fluid cap after I scrubbed off all the gunk that was on it … [im…

This is the symbol I mistaken it for from my over flow cover [image]

I do want to clarify that the only thing visible before I scrubbed off was the dex- and part of the symbol

Have the transmission fluid flushed, and cross your fingers. Tester

I was definitely planning on doing that but first wanted to get some options on if that would even do anything or if this was definitely a fatal error

Are you sure that’s not the power steering cap? Is there a short dipstick attached to it?

@It_s_Me So there is a cover that is over the engine when I was shown where the radiator cap was the first and only time it was a few years ago and that cover was already off… so I didn’t realize that at the time and I added a picture of what that cap looks like … being dirty and just showing the s…

Accidentally put coolant stop leak in transmission fluid

Maintenance/Repairs

ledhed75 April 7, 2021, 7:52pm 2

Ugh. Probably “fixable” with a new transmission…This is not good.

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Accidentally put coolant stop leak in transmission fluid

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