Stevie

Its an electric water pump. I think there is no thermostat neither, its like a chamber that pivot and open and close to divert the coolant, either to warm up the engine and transmission oil or to the rad. It seem like a complicated engine setup! My goal is to keep it for decade... lol. I'll be fine with all the global warming happening!

Well here is the easiest explanation i have for you, on Henday, lotsa heat, stop and go, medium heat, idling, no heat! I guess that the way it work nowadays!! I was just wondering if it was normal or not, dealership said its normal and the loaner they lend me today was even worst than mine! Its all good!

It does have shutters and they are working, mostly closed as far I as know, I drop my truck at the dealership this morning and they let me bring another Sierra with the 2.7 turbo home, this one here is even worst than mine, coolant won't even reach 100 mark on highway with heater on.. it must be how they work I guess!

that's in still air, when driving at highway speed, gauge will climb up to 100, nice a warm air in the cab, as soon as I enter the city and stop at traffic light, gauge start to drop again. I live in Edmonton Alberta, so we do get fairly lots of days below -20c.

I wonder if it's normal that my coolant temp gauge stay that low after 30 minutes of idling on freezing temperature. Engine is a 2.7 turbo 4 cyl. -21c/-6f.