Cab won't heat up, unless it's idle in drive - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 02-09-2014, 08:00 AM Thread Starter
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Cab won't heat up, unless it's idle in drive

Hey everyone, I have an interesting situation. I live in central MT where the temperature can, and does like to get to -26F. I've driven it on a few 4 hour drives, and it doesn't warm up very much at all, like the temperature gauge doesn't even move off low. I figured with a long drive it would heat up at least, but it doesn't. In the mornings I'll let it idle for 15-20 minutes before my drive and it won't warm up at all.

Normally, I would think it wouldn't warm up solely because it's flippen -25 with a -50+ windchill, however I do have a few friends here with pretty much exactly the same truck, same year etc and they have no problems warming up, weather it's for a 5 minute drive or a 5 hour drive.

Here's where something interesting happened. I've had the truck for about 4 months and it's always kind of been the same, the temperature gauge never moved off low, and I thought it was just a bad gauge. However, the other day I left it idle in drive, I just put in into a snow pile and it it didn't move, idled for about an hour in drive while I was taking care of some things, and when I got back, the truck was actually very warm and the temperature gauge was in what I would think of to be normal, first time I've ever seen it warm.

Sorry for the long post, but does anybody have an idea of what could be wrong? It's pretty inconvenient having a truck that won't warm up when it's -20F. Thanks in advance, Austin.


2005 F350 CCLB 6.0L Banks High Ram Air Intake, No kittys, stock as far as I know other than that. I do know previous owner had the banks 6 gun with the banks iQ.

2005 f350 6.0L crew cab long box, banks ram air intake, cat removed
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post #2 of 9 Old 02-09-2014, 08:06 AM
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Honestly sounds like your thermostat is either stuck open or has been removed. Good luck


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post #3 of 9 Old 02-09-2014, 08:22 AM
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Strange. I have an 04. It takes a bit, and on real cold day like you say -25 or more, it, the engie, never really gets up to temperature. It gets warm, but not hot, it always runs a little on the cool side, pretty much any diesel i have run does the same in cold temps.

The cab heater though works quite well. Might have to have it turned all the way up on the heat and the fan blowing full when driving, but it will keep it nice and warm on cold days, colder than -25.

Have you tried a winter front cover. They do help immensely.
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post #4 of 9 Old 02-09-2014, 09:05 AM Thread Starter
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If the thermostat was stuck open wouldn't it warm up after it had been driving for a while, several hours at that? And the cab never gets toasty except the time I left it idling in drive. I guess I'll pop in a new thermostat and see what she does.

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post #5 of 9 Old 02-09-2014, 09:12 AM
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The thermostat opens and closes with coolant temp. Sure sound like the stat to me also.

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post #6 of 9 Old 02-09-2014, 09:27 AM
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Well when driving think of the amount of cold air you're forcing into the engine bay, coolers etc. Idling a 6.0 in cold weather the fan hardly moves.


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post #7 of 9 Old 02-09-2014, 11:29 AM
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mine was doing the same thing recently! Replaced thermostat and I have full heat again! About a 20-30 min job!

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post #8 of 9 Old 02-09-2014, 11:53 AM Thread Starter
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Sounds promising! The thermostat will be here Wednesday so I'll keep ya posted about weather it fixes it or not
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post #9 of 9 Old 02-25-2014, 08:38 AM
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I had a similar problem last week when I picked up my 06 E450. Because it's an ambulance, it has the siren housings built into the grille, thus making finding a winter front almost impossible on short notice. The quick and dirty fix was to carefully insert cardboard up through the bottom between the a/c condenser and intercooler. In -30c weather, the temperature gauge is now showing just under halfway between cold and hot, so all good. Next step will be to figure out what is causing the air from circulating through the cab at highway speeds..... But at least the engine is comfortable!
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