scrmnvtwins

2008 Buick Lacrosse Super Series with LS4 V8 4 spd auto similar to Grand Prix GXP and Impala Ss same year. Want to add a trans cooler, any info appreciated.

IMPALAZL108

Ive added a Hayden transmission cooler to my 2008 impala ss and have experience a great deal of improvements....transmission runs so much cooler...(get it? Lol) but be sure to place it in an area that receives alot of cool air.

MillerMonteSS

https://ls1tech.com/forums/ls4-perfo...must-read.html

^^^There is a Sticky dedicated to this subject.

scrmnvtwins

Thanks, Headin to O'reilly after work to get a good Hayden Cooler. Better safe than sorry. This Buick sits in the garage all year and unfortunaetly when I get it out is being abused by pulling my Harley to Florida and back.

Seen the posts that siad trans line on tranny, bottom i s low and top is high pressure. Assume best to cut line on low pressure side and splice in cooler.

High pressure out of tranny through radiator, out of radiator through Hayden cooler, back in tranny low pressur line.

scrmnvtwins

Hayden cooler installed, PITA to remove the bottom ground effects jsut to access the radiator and tranny cooler hoses. FYI the top tranny line on the radiator is out and should be piped into the cooler

Ill_Born_ss

http://www.gmls4.com/index.php/topic,825.0.html
your FYI is correct

08GXPGXP

I have a cooler and all the stuff needed.. but even the best write ups confuse me.. no one really has clean pics. There all zoomed in and don't help AT ALL on finding locations.. I'm just going to to have to take it to a shop :/

91parkave

iTrader: (4)

What exactly are you confused about ? Your top line in the radiator is pressure the bottom is return you cut both and splice with new lines to the cooler just remember pressure goes to top return on bottom

08GXPGXP

Thats what I was confused about.. what line goes where lol..

The night we went to do it there was a little confusion on my buddies face so I backed out.. he does most of my work seeing as I'm not even close to being a mechanic haha.. but yes that is what was confusing..

Ill_Born_ss

In the above drawing
-the RED LINE is HOT (PRESSURE OUT)from the transmission into the LOWER of the internal rad cooler
-the ORANGE LINE is less HOT OUT from the RAD COOLER to the EXTERNAL COOLER (IN PORT)
-the BLUE is from the EXTERNAL COOLER (OUT PORT) to the RETURN PORT of the transmission

91parkave

iTrader: (4)

Thanks for the correction and is it the same with vehicles that don't have a second trans cooler mounted? On mine iirc mine just came factory with the radiator cooler. So the curved line out the trans pressure went to the top horizontal fitting on trans return was on the bottom

Ill_Born_ss

For a factory single cooler system.
If you look at the transmission in the picture above you will notice that there are 2 fittings on the transmission.
-A horizontal one (return fluid and attaches to the upper rad cooler port)
-A vertical one (heated transmission oil out attaches to the lower rad cooler port)

BOTH lines are pressure lines and the reason for the bottom to top cooling is:
- there is all sorts of material exiting your transmission, some of it is small metal particles and some clutch material. This material likes to stick to the inside of everything as it is sometimes extremely hot. So when you shut down heat rises and will find its way to the top of the cooler and back to the pan easily and some of this material will fall to the bottom while the car sits. Now back to the start up the gush of fluid coming up from the bottom will flush the cooler somewhat forcing the particles into the pan pre filter.

91parkave

iTrader: (4)

I know the orientation on the trans side, but the logic for bottom to top and then going top to bottom on the external cooler in the diagram seems *** backwards. because the logic stated dosent apply to the second cooler. and regardless on shut off the lines and cooler are filled with fluid unless youre running low on fluid. so the heat going upwards and forcing particles back to the return line seems stupid as well because when the car is started fluid will push them to return to the filter anyway. To me it dosent seem efficient to pump fluid "up hill" and also have to pump through 2 coolers with one being in the same core with hot enigne coolant.

Ill_Born_ss

I think you should re-visit the diagram for the proper routing, also the examples given were as stated in the first line and as you asked(for a single factory installation)
After you re-visit the diagram and discover that the line from the top of the rad cooler to the top of the aux cooler, it actually creates a trap to prevent the transmission internals from emptying back into the pan causing it to overfill the pan and venting out on the ground every time you turn your car off. There is 16 quarts in there and only a 4 quart sump. The same thing would happen if you were to hot in at top and cooler out at the bottom in a single rad cooler install. Now for the two coolers at once, if you live were I live it is the best practice because a cold transmission does as much damage as a hot transmission. So we and most people in a somewhat northern climate actually benefit from this situation. People in the southern climates may and should opt for the external only cooler as in the morning it is kinda warm already.

08GXPGXP

Haha soooo who just wants to install mine.. I tip well live in central il

Hook it up..

Or refer me to someone in my area that knows what they're doing hahahaha

99corvette

iTrader: (12)

OK I am confused now, My car has the same external cooler as the diagram, so when installing a aftermarket cooler I find the line coming out the bottom of it and go to the bottom of my aftermarket cooler, then out of the top of it back into the line I cut going back to the tranny? Sound right?

91parkave

iTrader: (4)

There are some theories as to trans cooler operation in this thread but personally I run standalone configuration taking the factory one out of the loop completely and have been for years running this config my trans has never blown fluid out as some have said earlier in this thread.

99corvette

iTrader: (12)

Well in my camaro, I tried both ways and saw no results on temp.

91parkave

iTrader: (4)

It will help just make sure you use a a trans cooler that's adequate for the vehicle