How Car Transmission Lines Work

By Mister Transmission

Automatic transmissions generate a lot of heat. Transmission cooling lines keep things cool but they’re susceptible to being damaged

Car transmission lines connect your vehicle’s transmission to the vehicle’s radiator. Also known as transmission cooling lines, they are typically made of metal or composite aluminium and rubber hoses because they can handle the flow of hot transmission fluid.

Your car’s transmission lines are essential to preventing the transmission from overheating by carrying hot fluid away from the transmission until it is cooled and subsequently pumped back into the transmission.

If your car’s transmission lines are damaged, they will leak, and that can lead to serious trouble if you don’t notice your car bleeding transmission fluid. But here’s the problem: most automotive transmission lines are particularly susceptible to damage or rupture owing to the fact they are exposed on the underside of your car to the weather, and to debris on the road.

How to Spot Car Transmission Line Problems
If your car’s transmission cooling lines are leaking, it’s not difficult to detect. The most obvious sign is if there’s red fluid pooling beneath your engine where you park your vehicle.

Other noteworthy warning signs that your transmission cooling lines may be leaking include:

  • You’re having trouble shifting into gear; the gears are slipping, or are shifting slowly
  • Your transmission is overheating, or you notice an unpleasant burning smell
  • You hear grinding or whining noises when gears change or the vehicle rattles or jerks when you drive
  • The “service engine soon” indicator on your dashboard lights up

If you suspect your vehicle’s transmission cooling lines are leaking, or if you have questions about preventative transmission maintenance, contact us. Take advantage of our free 21-point multi-check inspection and avoid the cost and aggravation associated with a failing transmission.

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Customer Reviews
They are the best team...
Azeez Al_zand
They are the best team ever and professional thank u guys again
Date: May 28, 2025
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Other shops were unwilling to...
Robin
Other shops were unwilling to assist with my transmission rebuild due to parts availability ('04 Mitsu Lancer Ralliart). Mister Transmission allowed me to purchase the parts kit needed (from the USA) and used it to complete the rebuild. The cost was fair and turnaround was very quick.
Date: May 27, 2025
Website: Google
Good service, everything was done...
Kolya Berg
Good service, everything was done on time.
Date: May 27, 2025
Website: Google
Other shops were unwilling to...
Robin
Other shops were unwilling to assist with my transmission rebuild due to parts availability ('04 Mitsu Lancer Ralliart). Mister Transmission allowed me to purchase the parts kit needed (from the USA) and used it to complete the rebuild. The cost was fair and turnaround was very quick.
Date: May 27, 2025
Website: Google
Very kind employees, great service!...
Hayley Burrows
Very kind employees, great service! A lot of work done on my vehicle and I got it back in a short amount of time! Will come back again !
Date: May 27, 2025
Website: Google
I’m happy to have found...
Just Me
I’m happy to have found this shop. Not only were they able to find the problem but were honest enough to let me know it wasn’t in fact my transmission!!
Date: May 27, 2025
Website: Google
Other shops were unwilling to...
Robin
Other shops were unwilling to assist with my transmission rebuild due to parts availability ('04 Mitsu Lancer Ralliart). Mister Transmission allowed me to purchase the parts kit needed (from the USA) and used it to complete the rebuild. The cost was fair and turnaround was very quick.
Date: May 27, 2025
Website: Google
Good service, the mechanic explain...
Diana Adames
Good service, the mechanic explain where was the problem. Change the filter and tramsmition oil very fast 2 hours for a BMW. Thank you, The only issue was they give me 2 different quotes with$200 differences.
Date: May 27, 2025
Website: Google
A huge thank you to...
Mohan Cappuccino
A huge thank you to Denise and Shawn for their honesty and integrity. Went to their shop expecting to need a torque converter, after the dealership "diagnosed" the problem. Shawn ran his own tests and found that the problem was something else entirely, unrelated to the transmission. Didn't charge a dime and saved me big $$$ on a repair that wasn't needed. Wouldn't hesitate to go back if I ever DO need transmission work.
Date: May 26, 2025
Website: Google
Very good experience.
Gp Bezaire
Very good experience.
Date: May 26, 2025
Website: Google
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