Aux cooler lines

[Nad_Yvalhosert]

what does hd cooling mean?

Heavy Duty cooling, means there's a factory auxiliary transmission cooler mounted in front of the radiator...

 

[GoToGuy]

It might, not always but may also include a higher capacity radiator.

 

[burbanswervin]

This is wrong. I don't know why I have it. Fatigue?

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?

 

[burbanswervin]

so which way should i hook this bad boy up?

 

[Caman96]

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[L31MaxExpress]

so which way should i hook this bad boy up?

Transmission output to the top of the radiator, bottom of the radiator to the auxiliary cooler, then auxiliary cooler back to the transmission.

 

[L31MaxExpress]

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I have never seen one setup that way, maybe part of a cold climate package. The radiator cooler is most effective with the inlet at the top and outlet at the bottom. The auxiliary cooler is most effective after the radiator cooler.

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[GoToGuy]

It's the same principle as the engine coolant. Hot in top cold out the bottom. The only time it's different is in special cases and the service manual will inform you.

 

[Caman96]

I have never seen one setup that way, maybe part of a cold climate package. The radiator cooler is most effective with the inlet at the top and outlet at the bottom. The auxiliary cooler is most effective after the radiator cooler.

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IDK, I can only say that’s how mine is plumbed and GM 15996169/GM 15995067 are the only lines for 1500/2500LD(4l60e) trucks with cooler and can only be installed like that.

 

[L31MaxExpress]

IDK, I can only say that’s how mine is plumbed and GM 15996169/GM 15995067 are the only lines for 1500/2500LD(4l60e) trucks with cooler and can only be installed like that.

My 99 Tahoe was absolutely backwards from that with a 4L60E. The line coming off the radiator going to the auxiliary cooler was on the bottom of the radiator. Transmission outlet went to the top of the radiator. The 99 K1500 Suburban we parted out had the same setup and it was installed on my brothers 99 C1500 Suburban when we put the S10 converter and fresh LT1 cammed L31 in it. The factory GM lines for the 98+ 4L80E in my Express van are setup the same way too. Fluid inlet at the top of the radiator and outlet at the bottom. It is impossible to mess that configuration up as well with the return to the transmission being halfway toward the back of the case.