I'm assuming it'* not a GM warranty. I would also assume that if you did a really neat job of installation, you could claim the car came with it, or it was installed before you bought it. A warranty company should actually be pleased by the installation of a trans cooler, and you could always simply remove it before any warranty work if you were in doubt.

great info, thanks again. Any ideas on cooler that would work on a 2000 SSEI?

I am pretty sure the stock 2000'* have tranny coolers. My moms SSEi has 2 radiators in the front, I am assuming one is a tranny cooler, and the other is obviously for cooling the engine.

We put a Drilled 180 in my moms car and noticed the same thing, it will hit almost 200 degrees now, but before it would hit 210 so it makes since because a 180 is only 15 degrees cooler, whereas in my dads GTP when he had a 180 t-stat it wouldn't usually go much past 180. It was difficult to heat the car up to 180 to get the T-stat to open, which would be one of the reasons it has a driled 160 in it now.
*All temps were taken from the Scan tool, not from the guages.

I recently took out a 160 and put in a 180. Gauge went from just over 150 to just below 200. I was figuring the gauge would read a little lower, but it more or less stays put just 200, so that seems okay. So the question is: Does the gauge not read correctly in the 180-200 range, or are 180 stats 195'* in disguise. Oh, I also put in a Stant Superstat.

I am temped just to remove the stat all together just to see what happens.
I dont live in the desert but the way the car reacts you think i lived where it is very hot. Always around 200, i think i will install a good tranny cooler to see if that helps, or maybe check the radiator cap.

Don't just take the thermostat out. The coolant will circulate too fast and it will run hotter. If you want to do something simular, take the center out of your existing thermostat. You will have the restriction for the water flow and it will be "open" all the time

With my 180 stat it will read 180 while moving or a little lower, but when I idle for a few min. it will hit 200, but no higher, and I got a cheap NAPA one, 5$.

No, the stock 2000'* do not come with a tranny cooler
What you see in front of the rad is the air conditioner coils.
I would stronly recommend you add one first before any mods.

it is hard to find info on what tranny cooler to put in that would allow me to void my warrantee. Any ideas??

My dealer has seen my trani cooler. It'* cool with him.
It will not affect your warranty, unless you do a less than professional installation.
Any trani cooler that will fit will work.
Try one that measures 12" x 8" x 3/4" thick as a minimum. Select a good quality low restriction unit. Go to the tech info for details. It won't cost much and you can do it yourself. It will help to have a disc cutter to cut off the factory clamped ends of one hose. You can use double clamps for security but they shouldn't be necessary because the ends of the tubes are flared. Then just use the hose that comes with the cooler. You may have to buy more hose and fab up a small bracket to mount it to some existing bolts.