So the engine/coolant temps make sense to be 70's under normal colder temps and 80's when a bit warmer, if though you have good snow coverage hitting the heat exchangers. Mine is the 900T-R, so maybe a bit different for temps, but I do not think anything silly different. Leaky head gasket would normally see coolant in the oil or on the outside of the block, plus you would see it lowering in the bottle.   The intercooler is just cooling the air from the turbo that feeds the engine, the warmer that air, the less power the sled makes.....the fans on the newer 900T-R's I think was to try and deal with the inconsistent power the first year of the 900T-R were seeing and reported based on a heat soaked intercooler, so fan runs after you stop to get some of that air cooled off, plus help get some heat from that red hot turbo out of the engine space.   As for coolant too hot, I think the sled shuts down when coolant temp hits around 105 - I normally do not let mine get that hot idling it, but I know some let sled warm up until the engine shuts off by default due to getting too hot, I will let my sled warm up to in the 90's if I am just running it at home, if warming up for a ride, once I see 75/80, I shut it off if the group or i am not ready to ride/leave yet.  

The first couple rides I’ve put in the sled has ran around 77 - 80 degrees celcius in cold temps with good snow for cooling.  I figured this was a good temp.  Yesterday put a 200 km day in (first true ride).  It was warm out (plus 1 or 2) for a lot of the day, but trails had good snow cover.  Sled was running in the mid to high 80’s.  I still think ok, but has me scratching my head.  By days end things cooled off outdoor temp wise and my engine temps dropped back to the high 70’s when riding.  Only thing I can figure is the air over the intercooler was warmer meaning the air getting to the combustion chamber would be hotter.     When I bought the sled the guy selling it said he thought there was a cooling system issue (he thought a head gasket).  Between that and having a digital read out has me a little hypersensitive to engine temps.  I did bleed the cooling system (with front right in the air) and have replaced the rad cap.  Also ran some tests and am not finding signs of head gasket failure.  Other than the gauge reading higher yesterday the thing has / is running awesome.  Just trying to sort out what is and isn’t normal for these 150 hp turbos.  I noticed at a stop that the newer 180 turbos have a fan on them.  Mine doesn’t have that.   Probably paranoid about nothing, but interested to hear what folks find is normal for these units.  Some good points on heat soaked intercoolers.  Any idea how warm it needs to be to have that issue?  I didn’t see that at all yesterday.

Engine temps is typically the coolant that is measured and displayed, that of course will warm faster if not in snow or enough snow, especially warmer days…..I have not rode this year yet but I think normally in the 70’s when riding.  I am not sure there is a factory temp sensor that you can see for for the air from the intercooler, there has been lots of talk of a heat soaked intercooler and then the engine ECU removes power so sled is more like a dog for sure.....so generally speaking, the motor will make less power on warmer days.

What are you guys seeing for normal engine operating temps?  Do you find your motor runs hotter on mild days when the intercooler is getting warmer air?

Could be more Americans too or riders from out of province that normally ride in Ontario, are trying Quebec too. When I pealed off ofsc 2025 sticker off my sled there was a 2023 Quebec permit under neath it. Sled wasn't permitted in 2024. Some people are waiting and buying either Quebec or Ontario permit and taking a week or two of holidays.