I'm thinking this is probably just the way they are, but I don't understand why........... I have a '12 F250 supercab 6.7 FX4.... truck is an XL, no supplemental heat or anything. If it sits outside over night, and I go out in the morning after say a 35-40 degree night, start it up and let it run 10-15 min then drive 5 miles down the road to town, both temp gauges are still pegged on the cold side, and there's virtually no heat blowing on the defrost. Even if it sits in the heated garage over night, same temp, same drive to town in the morning, same lack of any heat. My old 2010 V10 that I traded for the 6.7, and my current 09 5.4 are the exact opposite of this. I can start the 5.4 cold, leave within a minute or two, and be making some heat within a few minutes. By the time I get to town, everything is well in the normail range, and I'm turning the heater down cuz it's too hot. Even once the 6.7 is fully warmed up the heater doesn't seem to make near the heat that the gas trucks do. I love the 6.7, I just find this a bit odd. Am I missing something, or is this just the way they all are?

 

Welcome to owning a truck with a diesel engine.

These newer engines are much better than the old ones were. My 6.0 took even longer to make any heat.

 

thats a diesel for you.

 

These trucks don't warm up at idle. Get in it and drive.
I can let mine idle for 10 minutes or I can idle for 30 seconds and just drive normal thru the neighorhood at 25-35 mph and it will warm up three times as hot in the same 10 minutes.

You need to get your EGT higher before your coolant will warm up. You need some turbo boost to increase the EGTs. idle just doesn't do it, since there is very little fuel being burnt.

 

I wonder why they have never considered an electric heater?

 

They have. It's called the supplemental heater option.

 

Mine with fast idle 1200 RPM is blowing heat in about 8 minutes

 

I used to ask the same question about my Volkswagen diesel. The answer I received is that these engines are trying to maximize fuel efficiency. If you think about it, things like noise and heat are wasted energy. So, the quieter and cooler you can run them, should result in a more efficient rig.

My '11 is slow to warm up also. It doesn't bother me as much knowing that this means it's designed for greater efficiency.

 

Its almost amazing...............15* outside all night and then 10 min of idling and no heat. My 6.0 warmed up. There is combustion going on and that must be generating 1000* or so in the cylinders. I think the thing is the cooling system designed for towing heavy loads in hot weather just overwhelm the heat generated. It doesn't warm like the 6.0 or the 7.3. In those trucks the trany warmed way before the motor.

 

I figured that's just the way they are. I don't remember my old '02 7.3 or the '07 6.0 I had being like that, but they may have been. I do remember on the 6.0 that the trans would definitely heat up faster than the engine though. Oh well, so far I'm very impressed with the power and mileage of the 6.7, so I'll live with it

 

Think of how much coolant a diesel has vs a gas burner. Make sense yet. And painted horse is right just drive it, it will make heat quicker.

 

I love my rapid heat supplemental heater. Worth every bit of the $250 it initially cost. I think ford is the only one to offer it which is one of the reasons I went with this truck in the first place. Had a duramax before and it took at least 10 to 15 minutes of driving to heat up.

 

Maybe the OP's truck needs a new thermostat. I understand it is a diesel, but after running a bit, it should still make the same heat as his other trucks did. ( I agree it will take a little longer) I would be worried about it running less efficient, if it isn't getting hot enough to burn the EGR gases, and instead is sooting up everything.

 

Watching the EGTs on my Edge CTS, You can see at idle you have very low EGTs. 250-300°F With an engine that has a cold soak, That heat from the combustion has to warm the block, Once up to temp, The thermastat opens and new cold coolant is mixed in slows the warming process, You have to heat all that coolant, that is constantly being cooled by passing through the radiator core with the 30° out side air. it just takes time.

Even with the Fast idle at 1100rpm, You only bump the egts 25-50°

If you start driving and get some turbo boost. Even still running 1300-1500rpm at 25 mph, your EGTs bump up another 100-150°. You are now talking 350-500° EGTs vs 250-300. So you will warm up much faster. Get on the freeway at 70 mph and you are pushing 500°. Any fast or hard acceleration will push the EGTS up to 800-1000°

The Rapid Heat Supplimental heater is a 1500 watt element in your your heater core that runs off your electrical system. 1500watt is about like an electric hair dryer in your bathroom. Thats not a lot of heat compared to the volumn of air trapped in your cab and the amount of heat needed to warm all the interior. But it starts pushing what heat it produces as soon as you start the truck and continues until your coolant temps get warmed up. Your Heavy duty alternator isbarely putting out enough electricity to keep up with what the Rapid Heat element is consuming, So you can't really have a bigger element unless you went with the dual alts.

 

i dont know about you guys but here we get frost on the windows overnight all winter long and if you don't let it warm up enough to at least defrost the windshield some you cant see anything. it really sucks pulling these new 6.7s in the shop when its -10 or -20 out because i can let it run forever still no melting. scrape the windows and roll the drivers down to see enough to get it in the shop is about the best i can do unless it has the rapid heat!