my car must have a 220 stat cause thats where it runs in the city but stays bout 200 while moving anyways im thinkng would it b better to go with a 160 or a 180 stat for my 97 ssei? just for the summer and ill go back to a 195 for the winter?

Your car has a 195, but the fans dont turn on until over 200. So changing stats wont do much in the city. I don't suggest a 160 unless you chnage the tune. You can do a 180 with no problems.

Your thermostat is a 195. Your fans aren't supposed to kick in till around 220 or 225, I forget which, which is why it never goes above that point. Getting a lower temperature t-stat in there will not help anything, just have your engine running cooler while cruising or moving faster.

If you want to have your car stay cooler, have someone tune your PCM to have the fans kick on at a lower temperature, or get an auxiliary fan installed that stays on all the time.

While we are on that topic....can I use the Tech II and lower the temp. when the fans kick on?

Who near me can do that does. Anybody know

Different Dealer Techs have told me, so I assume it'* valid; Several PCM settings/parameters are set to make the car run at 200. That is the design and altering one just makes others work harder trying to make it so. Unless you going heavy mod, IMO, leave it alone. It was made to run @ 200 and shouldn't be a problem if there aren't other ones present. (Old leaking seals, clogged radiator, etc.)

I think that'* particularly true only for the GXP or for later models. I know for a fact my 95 Regal will creep up to 220/225 before the fans will kick in, taking it down to 195, even with a 180 t-stat.

Actually this was when i had older models with the 3800 (85 Regency, 90 LeSabre, 92 Park Avenue) that did they same as what you describe, and I took then in trying to find a "fix". They told me what I stated (different times) and that if it isn't overheating, leave it be. I saw the 195-220 swing in the summer and towing a little utility trailer but none ever blew a cork. I did use the Park Ave quite a bit for chores with the trailer and did add a manual switch to the fans just to make myself feel better.

The stock 195F stat and fan settings of low speed at 216F, high speed at 228F are done to keep the motor running a bit hotter as it is more "efficient" at higher temps. Changing out the T stat like mentioned is worthwhile, but only helps with airflow.

If you'd like a reprogrammed pcm, I have your year unlocked in HPT and could do it cheap. Only thing is I'd either need your pcm or another 97 pcm and your vin #.