Sounds like maybe your seat front is not connected or warming...
mine does well - course I'm in Texas, so how well does it have to work for more than two or three days a year ?
(but we were at 19 degrees the other night !)

Also I do have and LOVE "de Platinum" - front and rear heated seats AND steering wheel

 

My 2012 had the "Rapid Heat Supplemental Heater" option listed at $250.00, along with Engine Block heater $75.00, and Snow Plow Package, among other options.


I only let mine idle for a minute or so but I don't hammer it for several miles either. I can start feeling good heat inside after about 2 miles, and it was 12 degrees this morning.

 

Check the vent air temps with a thermometer and see if they are close to the temps I posted in my spreadsheet. (link in sig)

 

The cooling systems do work well, but they have absolutely nothing to do with warmup times. Only one of them cools the engine, and it's controlled by a thermostat. Meaning that big honking radiator isn't doing a thing to cool the engine until the engine warms up.

Probably not, my '11 had it listed separately but it was an XLT model. I wondered if it was even working, so one morning I plugged in a scan tool and compared my vent outlet temps with coolant temperatures. Within a minute of startup the vent temps were higher than the coolant temp, which would only be possible with a working electrical supplemental heater.

 

OK so I am wrong, the documentation clearly shows thermostats. Is coolant passing through the oil cooler at all times? Something causes these engines to take awhile to warm up, other than the huge fan blowing cold air all over the place. I also suppose CGI is better at dispersing heat even with thinner walls than cast iron so that would increase the amount of time it takes for the block to heat up.

 

Yup, coolant is passing through the oil cooler at all times. But that shouldn't affect much because the heat extracted from the oil is going into the coolant which would go back into the engine as it circulates. The majority of the heat isn't shed from the system until it gets sent through the radiator when the thermostat opens.

I've never warmed up an engine before driving it, so I really don't have anything to compare it to. Seems like my 6.7L warmed up a bit slower than my 6.4L. I've always believed that this has to do with the much more efficient combustion cycle on the 6.7. I believe this engine is tuned to use minimal fuel possible to make the engine do what it has to, and all that means is spinning the engine slowly at idle. Doesn't take much energy to do that when compared with what it takes to push the truck down the road.

What is your fuel flow at idle in GPH?

 

Thanks for the spreadsheet info doczenith1. I'll give my truck temps a look over the next few days. I did a kind of an 'unofficial' test yesterday. I checked the temp coming out of my vents with just my hand about a block from my house and while there wasn't much heat, there was some coming out and after the engine running for only a minute or two. I need to find my probe thermometer now to make sure. I'll also look to see if there is a separate fuse for an electric heat strip as well.