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Coolant In Transmission Fluid 07' CTS #4437086
06/20/17 08:34 PM
06/20/17 08:34 PM
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
TX_1821 Offline OP
TX_1821  Offline OP
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
Hello yall,

I found myself in a predicament today unfortunately, when going to exchange all the ATF in my transmission.
I went to remove a return line out of the radiator, where the return atf comes out......
And COOLANT came out, yup Coolant. (Yes it was the right hose, without a doubt)

Any ideas on best case scenario/action to take???

Was going to exchange about 8 quarts, but now I might even do 10+ as I need that coolant out of the system.
Also going to just run the ATF through an External Oil Cooler and bypass the [censored] stock one. (Looked into it and is quite a common problems on CTS's

Thanks for reading, feedback ,thoughts, or random comments smile


Computers don't make mistakes...What they do they do on purpose"
-Dale Gribble

16' Lacrosse 3.6 LFX
Oil: QSUD 5w30 & Fram Ultra
ATF: Valvoline Dex 6
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4437094
06/20/17 08:40 PM
06/20/17 08:40 PM
Joined: Oct 2014
Posts: 1,219
NoVA
Jimzz Offline
Jimzz  Offline
Joined: Oct 2014
Posts: 1,219
NoVA
Did you unscrew the trans fitting or just the smaller line? Can you post some pictures?


yup
Re: Coolant In Transmission Fluid 07' CTS [Re: Jimzz] #4437100
06/20/17 08:47 PM
06/20/17 08:47 PM
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
TX_1821 Offline OP
TX_1821  Offline OP
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
Originally Posted By: Jimzz
Did you unscrew the trans fitting or just the smaller line? Can you post some pictures?


It was the actual fitting (one that needed a quick disconnect tool to pull off)
Sorry no pictures, was doing it in a hurry/started to pour!!

Also random picture of how my cooler lines look (Google pic)
-It's the one on the lower far right


Computers don't make mistakes...What they do they do on purpose"
-Dale Gribble

16' Lacrosse 3.6 LFX
Oil: QSUD 5w30 & Fram Ultra
ATF: Valvoline Dex 6
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4437107
06/20/17 09:00 PM
06/20/17 09:00 PM
Joined: Dec 2013
Posts: 2,088
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,088
socal
Try draining the trans from the drain plug to see if coolant is coming out of the pan.


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4437110
06/20/17 09:05 PM
06/20/17 09:05 PM
Joined: Mar 2014
Posts: 3,255
NJ
Leo99 Offline
Leo99  Offline
Joined: Mar 2014
Posts: 3,255
NJ
well, um, it must have been the wrong line, no? Maybe there is another heat exchanger where the small coolant lines go and there are two other ATF lines there.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
2015 Camry 59,000 miles
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4437130
06/20/17 09:31 PM
06/20/17 09:31 PM
Joined: Aug 2016
Posts: 268
Alberta
carviewsonic Offline
carviewsonic  Offline
Joined: Aug 2016
Posts: 268
Alberta
That can't be good for the trans, hopefully you caught it real early before much coolant made its way into the trans... you would see trans fluid in your rad then as well?


'18 Impala
'03 Park Avenue
'05 Park Avenue
'07 Honda Accord
'09 VStar 1300
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4437131
06/20/17 09:32 PM
06/20/17 09:32 PM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'murica
It sounds like you're already on top of it with the external cooler. You're gonna want to flush both systems thoroughly. It's always a good idea to plumb a filter in when you install a cooler, but you should definitely do one since the coolant in your trans has probably been causing extra wear.

Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4437162
06/20/17 10:01 PM
06/20/17 10:01 PM
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
TX_1821 Offline OP
TX_1821  Offline OP
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
barkingspider,
Nice suggestion!!!
Will do.
Hope I won't find any coming out, I'll be praying frown

Leo99,
No it's definitely transmission, Both bottoms are, just that one is the return. (Ask me how I know, ha!)
Way it's setup is that coolant is on top portion of radiator and atf on bottom, however supposed to be separated.
Mine's probably leaking through though... (Obvious poor design/ maybe more quality on GM part)

carviewsonic,
I know, probably worst case scenario.
As long as it's not in the pan (To be done tomorrow) I won't be too scared...
Don't know to be honest, probably drain it and check it out though. Already there messing with it.

Ethan1,
Were going to find out, lol. Hopefully wasn't too long.
"Plumb a filter" , you mean like add one in, like a magnefine or something???


Also was able to get a trans filter, found a returned new one $12 Wix at local autozone!!!
Man these things are literally a pan with a sponge like media filter on them...
Bet a ton of stuff goes through them.


Computers don't make mistakes...What they do they do on purpose"
-Dale Gribble

16' Lacrosse 3.6 LFX
Oil: QSUD 5w30 & Fram Ultra
ATF: Valvoline Dex 6
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4437279
06/21/17 06:01 AM
06/21/17 06:01 AM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'murica
Yeah a magnefine or there are adapters that will accept a spin-on oil filter

Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4441483
06/25/17 09:02 PM
06/25/17 09:02 PM
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
TX_1821 Offline OP
TX_1821  Offline OP
Joined: May 2017
Posts: 69
Arlen Texas..... (Houston)
UPDATE:

-Finally got to installing the external transmission oil cooler with a magnefine and transmission fluid exchange.
[censored] is this car quick & wayyyy smoother.
Fortunately radiator had only little trans fluid. Drained all I could, little more than 2 gallons.

Transmission oil was completely black and quite watery from the trans lines, where there was some anti freeze.
None in pan however, it was thicker and darker! (if there was any coolant I couldn't tell visually)
Had to go through about 8 quarts of cheap atf fluid to even get a hint of red. Kept on coming out black.
Used valvoline maxlife atf.
Feels like a new car now!!


Computers don't make mistakes...What they do they do on purpose"
-Dale Gribble

16' Lacrosse 3.6 LFX
Oil: QSUD 5w30 & Fram Ultra
ATF: Valvoline Dex 6
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4441585
06/26/17 12:25 AM
06/26/17 12:25 AM
Joined: Jul 2005
Posts: 30,422
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,422
NY
Coolant, even a small amount in an automatic transmission can wreck havoc, especially to the clutches. The problem might not show up immediately, but soon after. I hope you caught it early enough. It doesn't have to be in the system very long to cause damage. Good luck.


God Bless Our Troops

Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4441665
06/26/17 06:08 AM
06/26/17 06:08 AM
Joined: Oct 2008
Posts: 12,471
The Old North State
Sayjac Offline
Sayjac  Offline
Joined: Oct 2008
Posts: 12,471
The Old North State
Interesting. So the radiator internal trans cooler area developed a leak or leaks allowing coolant into the trans lines. wow. Don't think I've ever heard of this one before.

Seems like external cooler a good call in this case. Hopefully trans didn't sustain significant damage. Good luck.


Re: Coolant In Transmission Fluid 07' CTS [Re: Sayjac] #4442051
06/26/17 03:05 PM
06/26/17 03:05 PM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Originally Posted By: Sayjac
Interesting. So the radiator internal trans cooler area developed a leak or leaks allowing coolant into the trans lines. wow. Don't think I've ever heard of this one before.

Seems like external cooler a good call in this case. Hopefully trans didn't sustain significant damage. Good luck.



I see it weekly here at Acura.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Coolant In Transmission Fluid 07' CTS [Re: mightymousetech] #4442057
06/26/17 03:16 PM
06/26/17 03:16 PM
Joined: Dec 2016
Posts: 506
E. Tennessee
WhizkidTN Offline
WhizkidTN  Offline
Joined: Dec 2016
Posts: 506
E. Tennessee
Originally Posted By: mightymousetech
Originally Posted By: Sayjac
Interesting. So the radiator internal trans cooler area developed a leak or leaks allowing coolant into the trans lines. wow. Don't think I've ever heard of this one before.

Seems like external cooler a good call in this case. Hopefully trans didn't sustain significant damage. Good luck.



I see it weekly here at Acura.


Sadly, seems to be common on many makes. Perhaps a full bypass with a B&M TruCool plate type ATF cooler is a alternative.


His: '12 Kia Optima SX - 2.0L GDI Twin-Scroll Turbo [Tuned] (74K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (70K)
>EDGE 0W-20, Fram XG6607
Re: Coolant In Transmission Fluid 07' CTS [Re: TX_1821] #4442760
06/27/17 12:34 PM
06/27/17 12:34 PM
Joined: May 2012
Posts: 5,365
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,365
Fort Lauderdale, FL
Deleting the radiator circuit is one of the first things I always do. I don't feel that risk of transmission death is worth it in exchange for packaging efficiency.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

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