ATF cooler leak

[Blitzkrieg Bob]

Anyone ever have their ATF cooler go out?

I found a pink milkshake when I drained my radiator

[bimmo_2007]

Yeah, I had my ATF cooler worn last month on my 540, I saw the pink milkshake you talking about. This is a symptom of a worn ATF cooler, Usually ATF coolers leak fluid in the coolant but coolant does not leak into the oil lines.

[Bill R.]

leak coolant into the transmission, trashing it out. When you shut off the car hot there is still pressure in the radiator but no pressure in the transmission cooler oil lines so the pressurized coolant makes its way into the cracked or broken oil cooler. I'd pull the trans pan and take a look.

Yeah, I had my ATF cooler worn last month on my 540, I saw the pink milkshake you talking about. This is a symptom of a worn ATF cooler, Usually ATF coolers leak fluid in the coolant but coolant does not leak into the oil lines.

[Blitzkrieg Bob]

leak coolant into the transmission, trashing it out. When you shut off the car hot there is still pressure in the radiator but no pressure in the transmission cooler oil lines so the pressurized coolant makes its way into the cracked or broken oil cooler. I'd pull the trans pan and take a look.

Yup,

Fluid looked clear, but I picked up a filter & gasket kit and gonna drop the pan and change it all.

[ryan roopnarine]

when i dissected the radiator on my m50 car (almost the same rad as your m20) i discovered that the trans cooler on that car is basically a pretty solid metal (paper towel roll sized) tube with two points soldered on for the cooler lines. so while i understand that they do leak, i'm not sure why. perhaps at the solder/weld points for the lines?

[Blitzkrieg Bob]

when i dissected the radiator on my m50 car (almost the same rad as your m20) i discovered that the trans cooler on that car is basically a pretty solid metal (paper towel roll sized) tube with two points soldered on for the cooler lines. so while i understand that they do leak, i'm not sure why. perhaps at the solder/weld points for the lines?

I was told it is metal fatigue from heating and cooling under pressure over and over that leads to fractures in the tubes, or if you run water and cheap coolant you can get corrosion and pin holes

[Blitzkrieg Bob]

Yea, No pink milkshake in the trans pan....

The ol' 525 is back on the road