I recently installed a 160 degree Thrmostat in my 08 Sierra Denali, but even with both fans set to come on fully all the time (100% in State 0/below 192) and driving at 50mph at night, the water temp never drops below about 195ish. What gives? Anyone else encounter this?

 

not to be a smartass but are you sure it's a 160?

 

That is about what a 180* thermo would run. 160's run around 180* when fully open.

 

What temp do you have the fans set to come on at? The engine will still heat up, even with a 160 stat, only difference is that the stat opens sooner. I have a 160* t-stat and have my efans set to come on at 180* and off at 173*, my truck usually runs around 175ish

 

With a 160 mine runs at 172 on the highway and I set my fans to come on at 178

 

mine runs about 175 fans don't kick on for a while...... Sucks during the winter though Heater doesn't get real hot

 

you got that **** right i work night shift and get off at 2:30 and it sucks on a good cold night

 

I have great heat in the winter, and it comes up fast too (since the t-stat opens up sooner and coolant is flowing sooner). I've never had a problem running 160 stats in the winter in any of my vehicles

 

Same here. Im running a 160* in my denali now and havent had any heater problems at all and if anything its warmer. BTW the temps here have been below 20 for the past three days.

 

I honestly don't know for sure if it's a 160. Ordered it from Summit and it came in a small plastic bag with a serial/stock number on it, but nothing to indicate what temp it was. I was wondering whether it might have been a 180/190 myself. Temperatures around here average like 78-80 degrees this time of year, although today we have a cold front passing through, so its a freezing 72 degrees or so outside today! Thanks for the input - I think I'll order another 160 and see if it makes a difference.