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  #1  
Old 01-19-2005, 11:31 AM
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Does your diesel run colder when it is close to 0?

Last night my SDL just would not get above 80C, usually it runs just above the 80C line probably around 83-85. It was about 0 out and I was just driving around town, but no matter what I did it would not budge above 80. Well until I dropped it down to 2nd and got on it then it started to come up to temp. Is this normal? I was keeping the rpm's up in 3rd but still the temp wouldn't get above 80. Maybe because their really was not any load on the engine, I would imagin on the highway it should come up.


The good news is she starts right up, so far no starting problems.

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Old 01-19-2005, 11:47 AM
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I will probably never know the answer to that question
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  #3  
Old 01-19-2005, 11:54 AM
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Mine usually runs right at 80. Yesterday morning it never got up that high on the way to work. Maybe 75-76 deg.
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Old 01-19-2005, 11:55 AM
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I have noticed the same thing with other cars owned in the past, but not with my 124.

One would think that the thermostat would be consistant reguardless of ambient temps, but other dynamics are at play, oil takes longer to warm, very cold air effecting etc. I doubt you have anything to worry about but when was the last time you replaced your thermostat?

This morning it was 2 below and have had to start my engine the last couple of weeks without the aid of the block heater as it no longer functions. Two glows and holding the starter a bit longer than usual, it fired off! BB
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Old 01-19-2005, 11:56 AM
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Mine won't hit 80°C until I floor it through most of 3rd gear when it's below 15°F outside. A run down the highway will always warm it up, but farting around town makes for a cold engine and a cold driver. *shiver* Oh yeah, once it hits operating temp, it stays there, so it's not like the thermostat is sticking open.

One more thing, I'm missing half of the plastic lower engine covers. The big one is there, but the one below the transmission is missing, allowing a lot of air through the engine compartment.
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  #6  
Old 01-19-2005, 11:58 AM
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It's a good thing you guys don't drive TDIs. They absolutely will not warm up until you go for a jog down the highway. If you start it and let it idle to "warm it up" in the morning, you'll come back to a stone-cold car. They're just too efficient to make enough heat to increase the temperature of the engine and/or interior. At 0°F outside, it takes a TDI 30 minutes of idling to reach 60°C
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  #7  
Old 01-19-2005, 12:13 PM
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My 124 has been running at normal temp, just above 80. It takes it a while to get there, though (but not disturbingly long). Of course it doesn't get too warm while idling; if I leave it for 15 minutes it will usually get up to about 40, and then goes up to 80 reasonably soon after I start driving a bit.

I had noticed the slow warming up of my sister's TDI. I had to laugh ... she was telling me how she wished she could get one of those remote starters so she could start the car and have it all warm before getting in it to drive to work in the morning. I told her she'd have to get up darn early to press that button if she wants it "all warm." I noticed it does take a long while to get warm, even after it's been driven a while.
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  #8  
Old 01-19-2005, 12:22 PM
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On the 617, the thermostat controls flow off the front of the engine and the thermostat measures off the side of the head. Assuming greater convective heat transfer along the whole exterior of the engine, I would think their should be a slight difference, which is what I see too. That being said, you never know for sure if that thermostat is starting to change. I had a heating problem a few weeks ago. The thermostat failed AND the aux water pump failed. I highly doubt one had anything to do with the other. It was just their time.
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  #9  
Old 01-19-2005, 12:28 PM
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It seems to be pretty normal Hattie,

I started my car up this morning and it fired right up at 0, although it was clearly not that happy...it cranked slow at first but started up with one glow. I noticed the same thing though, it did really get up to temp until a mile down the highway.
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  #10  
Old 01-19-2005, 12:29 PM
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Diesels use a lot less fuel than gassers at idle so there is less excess heat. You really need to get them under a decent amount of load to get the fuel consumption (and waste heat) up to get any real warming. The next time you see a big truck driving around town in the cold you'll probably notice a zip up cover over the front of the radiator grill. That's to help those stay warm when they aren't under a lot of load. By the way, part of the reason you're getting lower temps is that the oil cooler gets really efficent at those low temps too, so without much of a load the engine can have trouble maintaining temp even if the thermostat is good.
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  #11  
Old 01-19-2005, 12:40 PM
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When it is zero outside if I leave my car idling and come back to it in 15 mins, the cabin is warm (from leaving the heat on lowfan/Max) and the engine is at about 82C, once I start driving it rises to about 84C, and stays there, even when its zero out. And its real toasty in the car But if I crank up the fan to High or defrost, the engine temp will fall a little bit, to around 81C. I rarely have to put the fan above low, as the drifting/slow air from the vents is more than warm enough to make it hot in there. But yes, mine gets to the very same operating temp at 0 degs out that it does when its 90 out. It does take a little longer to get there (maybe 2.5 miles) but it does it.
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  #12  
Old 01-19-2005, 01:12 PM
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I still remember the SD out in Cincinnati when the temperature was 11°F. Running around town, the temp would just climb over the 80°C. mark. I had to stop at a drug store, so, I figured I would leave it running. Lock the doors with the valet key.

Get back to the vehicle 10 minutes later and the temp. is down to about 73°C. The diesel loses enough heat in conduction to the very cold air that it cannot maintain its thermostat setting.
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  #13  
Old 01-19-2005, 01:15 PM
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In this cold weather (it was -25 C yesterday morning at 8 AM), the car starts fine and of course it is slow. Quite slow... Once a few minutes pass it is fine, and in city driving the temp will hover around 80 C. If I stop for a while and it idles for a few minutes, the temperature will drop.

With the TDI, it too is slow when cold. It's easier to feel it with the TDI though (at least I think so) because it has a 5-speed manual, and you can feel the gearbox is a bit stiff and harder to shift. So you tend to drive with little throttle for the first while. Also, the RPM drops off way more quickly when you back off the accelerator during shifting. It's harder to notice this with an automatic... In city driving if I turn the blower on full with the heat on full, I can bring the coolant temperature of the TDI down. Turn the blower speed to 1 or 2 (where 4 is maximum) and the temperature will eventually get to 90 C during city driving.

It is definitely more noticeable that diesels are slower when cold than gassers.
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  #14  
Old 01-19-2005, 02:28 PM
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I have noticed that if I let the car idle with the heat on the engine temp will drop into the 70c range. Thermostat is fine, I replaced it last spring and tested it in a pot of water before I put it in.

However my SDL does have good heat, once the temp gets past the second line on the guage (50c-60C?) the heat will come on and work well.

Today it is 20 out and she runs at he usual temp, right above the 80c line.
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  #15  
Old 01-19-2005, 02:31 PM
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Quote:
Originally Posted by Hatterasguy
Today it is 20 out and she runs at he usual temp, right above the 80c line.
Poor SDL. Has to suffer in the cold and the salt while you push it all over Milford. No wonder it decides to break things on you.

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