Well we had our first real cold night at least for where I am from the overhead read 24 when I started the truck to let warm up before heading to the salt mine this morning. Anyway when I came back out to leave about ten minutes later I noticed my truck sounded different and low and behold It was idling at 1k rpms instead of 750. I have never asked for a high Idle to be enabled Is this a feature that is supposed to happen or Do I have something wrong? I am cool with the higher idle for warm up If it is supposed to just never had this happen before.

 

It's ok...it's SUPPOSED to do that when it's colder out

 

it is automatic when the temp is below something like 35? give or take a few *.

 

It's workin just right. . kinda nice aye. . .

 

Mine did it for the first time this morning also (34 degrees), tonight it should be in the 20's...Makes a world of difference.

I start mine and my wife's at about 6:30am, clean all the windows or scrape the ice off, by the time I'm done it's 6:45 and time to go. Hers (5.9 magnum) has full heat, mine 5.9 Cummins is still freezing, well today it wasn't...WOOHOO!

 

I am glad to see this I was under the impression it was something that had to be unlocked by the dealer through the computer which must be a totally seperate feature.

 

2 different features.

Auto high idle: When it's below 35 it kicks idle to 1000rpm until you take it out of gear or step on any pedal. (Always active from factory)

Controllable high idle: By entering into the cruise control functions while in park you can adjust your idle from Auto high idle (1000) up to 1500rpm's in 100rpm increases. (Must be activated by dealer)

 

Auto high idle kicks in after 2 minutes of idle and works as stated above. Some of you guys should consider some type of cold weather front. I made my own out of a fender cover and mounted it to my condenser guard with a piece of aluminum flat stock. Really helps to get the engine up to temp quicker in cold weather. You have to remember that our Cummins was designed to pull a HEAVY load in hot weather all day long. The cooling system is built heavy duty. When it's cold out with no load, it takes way too long to get to temp, so you gotta help her out alittle...

 

I have this same problem. Why would the cooling system even matter though if the thermostat stays closed? It almost seems like the thermostat is stuck because mine will cool down to 140* when going downhill for long periods (even after running uphill at 200*).

 

Like TRK396 I also fabed my own winter grill cover. I used a couples pieces of heavy insulated Vynal (sp?) and attached it to the inside of my grill. Cut 2 small vents towards to upper middle and were good to go. It is flat black so it is hard to see through the grill so that along with the block heater gets me warm, sort of, after a few miles. Even when pushing hard up some long grades when temps are in the 30s the temp gauge stays very close to 200 max.

 

Mine did the high idle trick the last two mornings, nice feature.
Does take FOREVER to get above 140 when unloaded, at least the heat starts to work after 7 minutes or so.

 

With my 03 and 05 it would be on as soon as I started up SOMEtimes, and others it would take a minute or so. I'm not really sure why. I have the cruise feature on the 05, and it is great. Also good to have in hot weather after towing, or even on warmup before towing. Unfortunately you can't have the cruise feature "enabled" on the 03's. However, you can have a high idle switch installed at a truck outfitter I would think. I had one on my 98 Chev 6.5 turbo, and it worked almost like the cruise setup, except you couldn't take it up to 1500 from 1000.