Regarding this switch, relay fan set up , I've had no luck finding it on summit, intense or just a general google search. Are you referring to an already manufactured, plug in set up or a home made version? I was just looking for another way besides getting the PCM reflashed to lower engine temp in addition to the 180 stat. ThanksI've seen the wiring harness with the relays and the switch. I think I may go that route. It's only $100 which is way less that a programmer. Thanks for your advice!!!!!
I thought that there might be 3800 people around metro Detroit but although I've had this 05 Impala SS for 12 years,I just recently started to do the usual bolt ons like the 3" DP, front PLOG (looks more like a shorty header to me) FWI and just a 3.6" pulley, 180 stat (with the holes). Don't know why I started to mess with it at 120,000 miles but the engine is still rock solid and the original trans still shifts fine. I was always more old school with an 86 Olds 442 , 68 Olds 350 with a 650 DP Holley and HEI ignition...18" flex fan. Not even thinking mid 12s with this Impala like the Olds but those basic bolt ons did wake it up more than I thought it would. In 08 I just did the U bend delete, FWI and that was it for 11 years. I know I should get a PCM tune but at least the KR for now is no more than 1 on a upper 80s day. Low 80s and lower , it's 0. Seems like Im getting 200, sometimes 210 max if it's high 80s, above 90 and stuck at a light but it drops below 200 in a half mile of cruising. Sept. weather here really wakes it up. An Gen 3 M90 with iron heads isnt the best combo with hot humid weather but it works. Yank the fuel injection and coil pack off that 3.8 and it's about as old school as that 68 Olds 350. Considering these 3.6 DOCH engines are supposedly 300-335 HP, this OHV 3.8 has done OK in a few 0-60s at a light the past couple months. And I know this relic isnt near 300 HP. Thanks again for all your info. I signed up for this site in 2018 but have rarely visited it.There's a boatload of guys around there who have that capability (I was active in Motor City Club GP for 5+ years when I lived in SE Mich until ~2006-7). In fact, the only large 3800/Wbody gathering remaining is each June, north of Detroit, near Flint (Holly) where the engines were built. Try seeing who's on the FB groups, since that seems to be where anyone left from the old forums still might chat (I may get FB soon, just to see who's still there 😖).
Good luck, and as long as you're not getting above ~210 in very hot conditions, you're fine. Just don't beat on the pedal until you've seen it get some airflow to cool it back to ~190 or less with that t-stat. Drilling 2-4 holes in the tstat's flange (~1/8") can assist, too.