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Not that I am trying to create ways to spend money, but here are the results from this mornings drive home. Westbound freeway route was pretty jack so took the longer route on surface streets. Outside air temp was 41 F. Drove approx 47 miles and it took about 55 minutes. Speeds were 35 to 40 on some roads and then 45 to 50 mph. After about 15 minutes of driving I observed variation in engine coolant temp. At a stop light temps were 172 F. While driving, engine temp reached 181 F. BUT, as I decelerated to a signal light I could see the temp rapidly drop down to 172 F each time. Then, when accelerating from a signal light temp would go right back up to 180 and stay there as long as I maintained the same speed. I did not see this condition the first time. Sounds like low coolant, right? I will go check it. So far, no signs of external leaks under the truck, but I had not been looking for a leak earlier.
Guys, he's only talking about ambient air temps down to 22 degrees, that is ABOVE ZERO, not 22 below.
OP's truck will hardly be affected by such temps, and should be achieving full operating temps within 10-12 minutes of driving.
OP is driving for nearly an hour and the engine temp still hasn't reached full temp, definitely not right.
Mine must be broken then too. Temps below freezing if I drive empty 13 miles to work mix of town and interstate, takes 30 minutes, the temp will be 176-180. With any kind of load it gets up to normal 200 pretty quick. Runs this way down to -30F without blocking the grille.
Auto shutters behind the grille sound like a great idea until you get into freezing fog, blowing snow, or have to start busting drifts. Then they freeze up. I would prefer if they kept them away from the super duty lineup.
Not that I am trying to create ways to spend money, but here are the results from this mornings drive home. Westbound freeway route was pretty jack so took the longer route on surface streets. Outside air temp was 41 F. Drove approx 47 miles and it took about 55 minutes. Speeds were 35 to 40 on some roads and then 45 to 50 mph. After about 15 minutes of driving I observed variation in engine coolant temp. At a stop light temps were 172 F. While driving, engine temp reached 181 F. BUT, as I decelerated to a signal light I could see the temp rapidly drop down to 172 F each time. Then, when accelerating from a signal light temp would go right back up to 180 and stay there as long as I maintained the same speed. I did not see this condition the first time. Sounds like low coolant, right? I will go check it. So far, no signs of external leaks under the truck, but I had not been looking for a leak earlier.
Right, above zero. As I already mentioned, at 22 above zero my truck takes FOREVER to warm up and sometimes will never get to 190F water temp. It's inherent to the design of a diesel engine especially one that's got enormous coolers all over it. I remember in 2002 my father ordered a new Cummins H.O. chassis cab truck for work. EXCELLENT truck but on a cold day at a stop light you could literally watch the temp gauge fall.
I cannot imagine trying to even operate this 6.7 diesel at 22 BELOW zero. My goodness...
Four years ago we had our '17 6.7 out in minus 24 degree weather along with 12 mph winds, it was very comfortable in the cab as I drove for two hours wearing jeans and a t shirt, even slow driving through small towns it always put out good heat, truck was empty too, no trailer or load of any kind. No idea what the coolant temp was be we were warm, almost too warm.
Four years ago we had our '17 6.7 out in minus 24 degree weather along with 12 mph winds, it was very comfortable in the cab as I drove for two hours wearing jeans and a t shirt, even slow driving through small towns it always put out good heat, truck was empty too, no trailer or load of any kind. No idea what the coolant temp was be we were warm, almost too warm.
Your truck certainly has the "Rapid Heat" option on it then.
Your truck certainly has the "Rapid Heat" option on it then.
The truck did come with that option, but from day one I never noticed it being "on". I've read that once the coolant reaches approximately 48 degrees F, it will turn itself off...so its not on all the time, primarily to clear the windshield of frost sooner. Also they are said to provide very little warm air, almost useless but looks good on a window sticker. This truck is still pumping out good heat, last week we had single digits at night, I never thought about the heat output, just drove and enjoyed. I wouldn't worry about engine temps as far as heat output goes, if your not feeling warmth as needed, perhaps your temperature blend door is not functioning correctly.
On my 23 I use my block heater and front cover when it is in the 20-30's and it never gets to 190, it mostly stays around 180. One thing to remember is that the heater can drop the temperature a lot, I have seen it change when I drop my daughter off at work, a 20 minute drive, go from 156 to 178 minutes after when I turn down the heater to the lowest fan setting from the middle fan speed.
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