ok now that its winter ive notice that my heat isnt very hot, will putting my old 195 tstat back in instead of my 180 help that? i mean i never really had a problem with heat to begin with and im not hard on the car much...

do it. i just did mine and it makes a world difference. plus if your car doesnt warm up all the way, your car will run in open loop and it will kill your gas mileage.

Try it with a 160 My chip is tuned for it, but it does make a chilly morning a little longer.

my gas mileage hasnt suffered at all, my car pulls 35 hwy fully loaded up with all college stuff, but anyway ill be changing it tommorow if i can, ive got extra gaskets anyway

but on the highway, your car will get up above 180*, which will make the car switch to closed loop, increasing the mileage. just driving around town it will stay in open loop, killing your mileage. and its not good to run too cold. i had a 180*drilled and i would barely run at 150*.

I have to leave my 180* because my hispeed fans come on at 186 from my PCM.

I dropped the 195 back in because I wanted to ensure if a bad winter day happened, I had the extra heat to keep the windshield heated and clean.

Darn NE weather.

Chad, in reading the FSM the stock settings will turn off the high speed fans over 40-60mph. I believe this is due to the air flow at those speeds being faster than the fans. Although if you went above 180 degrees, you would still have the problem with city driving.

I wonder if ambient temperature needs to be above a certain amount before the fans will come on at 186. Now that would be nice! You would be able to swap out a t stat once the cold weather arrived.

Yeah, I just dropped a 195 back in mine and glad I did. It'* like 2 below zero F here today. BTW, you can minimize your bleeding efforts if you refill the engine with coolant at the thermostat hole and drill an air bleed hole in the flange of the new 'stat.

I agree 1,000%. Did this on my latest install and it worked great. The filling is a toss up w/o the bleeder. I feel there is still a good amount of air in there.

Yes, exactly. I had a 180 in my car for about 3 months. It sucked and I saw no improvement in anything. My gas mileage suffered. Plus, I'm not convinced that a 180 stat really has that much benefit anyways. GM put a 195 in there for a reason.