Coolant mixing with transmission fluid?

Tiny
DERRICK GIANAKIS
  • MEMBER
  • 2007 CADILLAC CTS
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 144,000 MILES
After car is warmed up, getting it to shift when driving 30 mph is maxing my rpm's. My line from transmission to radiator got pulled out and I noticed the color of the fluid coming out was a coffee with creamer color. I replaced radiator and transmission fluid and filter, filled radiator with water for temporary. Still have same colored fluid in my coolant reservoir and that's when I can't shift out of first or maybe second anymore. I wasn't having a problem I don't think before that line got ripped out. But I replaced it and the fluid and new radiator and can't figure this out. Don't want to pay the dealership. Please help.
Monday, September 23rd, 2019 AT 12:35 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Hello,

Here is a guide to help you do the cooling system and transmissions service. Make sure you replace the radiator as well the cooler is bad inside.

https://www.2carpros.com/articles/how-to-replace-a-car-radiator

and

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

and

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Yep, the transmission does not like coolant inside. but lets run the codes to see if you have a shift solenoid that is not working correctly. Here is a guide to help us:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.
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Tuesday, September 24th, 2019 AT 1:06 PM
Tiny
GERALE2010
  • MEMBER
  • 2 POSTS
  • 2003 CADILLAC CTS
Radiator went out, transmission fluid mix up with antifreeze got inside both transmission and coolant, what should I do to flush it all out
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Wednesday, March 31st, 2021 AT 9:50 AM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
You can flush them out the best as possible, as soon as possible. You may still have transmission issues, as the coolant de-laminates the clutches. Also, you may notice the rubber components of the cooling system sweating oil as it attacks and softens the rubber. Here is a guide to help you do the cooling system and transmissions service. Make sure you replace the radiator as well the cooler is bad inside.

https://www.2carpros.com/articles/how-to-replace-a-car-radiator

and

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

and

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers

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Wednesday, March 31st, 2021 AT 9:50 AM (Merged)

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