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Tranny Cooler Lines

knightr

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knightr Enthusiast

knightr

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Am installing a Hayden aux tranny cooler on my 07 GMT900 Silverado. I will install it in series with the OEM radiator cooler. I looked at my sons 2005 Z71 Silverado with the 5.3 and the routing from the transmission goes to the bottom of the radiator cooler, out the top of the radiator cooler to the aux cooler, then out the aux cooler to the transmission.

My question is: the inlet to the bottom radiator cooler is the tranny discharge and the line from the aux cooler back to the tranny is the return?

If this is correct, then is the GMT 900 routing the same as the GMT 800?

I want to make sure that I install the aux cooler downstream and in series of the radiator cooler.

As it appears I will only have to cut the top 3/8 line coming out of the radiator to put the aux cooler in series.

 

Thanx for any help guys.

2COR517 Enthusiast

2COR517

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Many people run to the aux cooler first. This allows the radiator to "re-heat" the fluid. This is good when the truck is cold, in the winter, or both.

txab Senior Enthusiast

txab

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Posted
Am installing a Hayden aux tranny cooler on my 07 GMT900 Silverado. I will install it in series with the OEM radiator cooler. I looked at my sons 2005 Z71 Silverado with the 5.3 and the routing from the transmission goes to the bottom of the radiator cooler, out the top of the radiator cooler to the aux cooler, then out the aux cooler to the transmission.

My question is: the inlet to the bottom radiator cooler is the tranny discharge and the line from the aux cooler back to the tranny is the return?

If this is correct, then is the GMT 900 routing the same as the GMT 800?

I want to make sure that I install the aux cooler downstream and in series of the radiator cooler.

As it appears I will only have to cut the top 3/8 line coming out of the radiator to put the aux cooler in series.

 

Thanx for any help guys.

Look at this post.

 

http://www.gm-trucks.com/forums/index.php?...st&p=838567

 

Edit: If you don't already have the small factory installed cooler then the pic doesn't help much.

Personally, install your new aux, cooler after the radiator cooler. No need to reheat the fluid in LA.

bossier62guy Senior Enthusiast

bossier62guy

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No need to reheat the fluid in LA.

 

 

Hook it up through the radiator just like the factory does.....winter 2008 in south louisiana :nono:

IMG_0383.jpg

txab Senior Enthusiast

txab

Posted
Posted

Global warming in LA. :nono:

 

 

Still no need for reheat in those conditions. :D If anybody is concerned about too low of temps, then you can get coolers that have thermostats that will bypass the cooler, sending fluid back to tranny. Also you can buy thermostats to add inline on models that have no such feature. As stated the factory has chosen to put their cooler inline after the radiator, so installation of aftermarket unit can be done the same.

brims Senior Enthusiast

brims

Posted
Posted
Many people run to the aux cooler first. This allows the radiator to "re-heat" the fluid. This is good when the truck is cold, in the winter, or both.

 

It's been said many times here that you run to the oil to water cooler first. No OEM or aftermarket system works any other way. If you reheat the fluid, you're heating it to 210 which is a waste.

  • 2 weeks later...
CapitalTruck Senior Enthusiast

CapitalTruck

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Posted

My factory tranny cooler setup is from the radiator (out of the top) to the aux. cooler. They put the inlet on the bottom of the radiator so the fluid doesn't freefall and foam (as it would if they had the input going to the top of the radiator).

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