it wasnt really down to -45c was it.

Nuje

Top Post Dawg
Joined
Feb 11, 2005
Location
Island near Vancouver
TDI
2002 Golf 6MT; 2015 Sportwagen 6MT; 2016 A3 e-tron 6DSG
That'll do it.
[rant]
I wish the weather-folk would stop giving me temperature "with the windchill". There's a massive difference between legit -45°C and "-45C with the windchill".
If you stand with your back to the wind at -17C (0°F)....feels like -17C (which, if you have winter jacket and pants on, isn't terrible); if you're running 10km/h into a 10km/h headwind....well, yeah - that's a lot colder. And your car...well, the engine is protected from the wind, so the temperature "with the windchill" is completely useless as a measure of whether or not you might need to plug in the block heater.
[/rant]
 
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DCM1

Well-known member
Joined
Jul 6, 2022
Location
BC
TDI
2001 Jetta sedan 5 speed
-45 is -45 no matter how hard the wind is blowing. The wind simply removes heat faster, doesn’t make it actually colder than the temperature. Not sure if that’s the point you’re bringing up.
 

Nuje

Top Post Dawg
Joined
Feb 11, 2005
Location
Island near Vancouver
TDI
2002 Golf 6MT; 2015 Sportwagen 6MT; 2016 A3 e-tron 6DSG
Not really - it's more like I find it's useless to me hearing weather reports saying that "it's going to get down to -60C!!!!!!!! (with the windchill)".....

Whereas, I wanna know - what's the actual temperature going to be.
-40C with 5kph wind (really freaking cold!) is a lot different than -17C with 25kph wind - if I'm walking/running with the wind or can protect myself from the wind with clothing....meh.
 

J_dude

Veteran Member
Joined
Jan 9, 2020
Location
SK Canada
TDI
2003 1.9l “Jedi”
-45 is -45 no matter how hard the wind is blowing. The wind simply removes heat faster, doesn’t make it actually colder than the temperature. Not sure if that’s the point you’re bringing up.
While I think I agree with you on it just removing heat, I recently saw this brought up somewhere. Can’t remember if it was on the forum here, but someone mentioned that when you pull the valve core out of a full tire on a hot day and let the air out, the valve stem gets frost on it, and this was a result of the air cooling the valve stem below ambient. They had several other examples but I don’t remember all of them.

Not sure if it’s true but I’m curious.
 

J_dude

Veteran Member
Joined
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Location
SK Canada
TDI
2003 1.9l “Jedi”
Not really - it's more like I find it's useless to me hearing weather reports saying that "it's going to get down to -60C!!!!!!!! (with the windchill)".....

Whereas, I wanna know - what's the actual temperature going to be.
-40C with 5kph wind (really freaking cold!) is a lot different than -17C with 25kph wind - if I'm walking/running with the wind or can protect myself from the wind with clothing....meh.
I think they do this because stupid people exist, and since there’s seemingly more of them than the intelligent kind these days, maybe if they say the temp will be WAY colder than actual, it might scare people into actually wearing appropriate clothing..? Lol.
I mean, it’s crazy how many people I see wearing shorts or yoga pants or jeans w/more-holes-than-fabric in frigid temperatures...
 

PradoTDI

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Joined
Sep 25, 2020
Location
MT
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1991 Toyota LandCruiser LJ78 with ALH Swap
While I think I agree with you on it just removing heat, I recently saw this brought up somewhere. Can’t remember if it was on the forum here, but someone mentioned that when you pull the valve core out of a full tire on a hot day and let the air out, the valve stem gets frost on it, and this was a result of the air cooling the valve stem below ambient. They had several other examples but I don’t remember all of them.

Not sure if it’s true but I’m curious.
This is due to the air expanding as it leaves the pressurized tire. This is the same principle that an AC system uses to cool air, and the same reason that a butane canister will cool and possibly frost up when running a stove.

Windchill has no effect on inanimate objects like engines, regardless of how exposed they are to the elements (except when running and trying to maintain operating temperature, or cooling off after being run).
 

WolfgangVW

Veteran Member
Joined
Oct 16, 2011
Location
Alberta, Canada
TDI
2003 Jetta TDI - Manual
I'm the same I like to know the straight up temp not considering windchill. As earlier posted -40C or whatever is way different as the temp with no wind vs -17C with a wind etc. and -40C is the windchill value.

That being said any information helps depending on what activities you need to be doing!
 

braddies

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Jul 26, 2021
Location
America
TDI
03 golf ALH
I think they do this because stupid people exist, and since there’s seemingly more of them than the intelligent kind these days, maybe if they say the temp will be WAY colder than actual, it might scare people into actually wearing appropriate clothing..? Lol.
I mean, it’s crazy how many people I see wearing shorts or yoga pants or jeans w/more-holes-than-fabric in frigid temperatures...
 

BobnOH

not-a-mechanic
Joined
May 29, 2004
Location
central Ohio
TDI
New Beetle 2003 manual
Yea, bet they print that shirt in a couple dozen versions.
I like "On the Internet" or I know it's true because I did my own research.
 

C.Powell

Active member
Joined
Oct 10, 2017
Location
Alberta
TDI
MkIV Jetta Station Wagon
If you have a good battery and glow plug system tdis will (reluctantly) start at -45c. Cycle the glowplugs repeatedly and it fires up one cylinder at a time. Keep the clutch down or the drag of the oil in the gearbox when in neutral stalls the engine.
 

PakProtector

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Joined
Jan 5, 2014
Location
AnnArbor, MI
TDI
Mk.4's and the Cummins
Wind chill is only the approximation of heat removal. You will not get -25C air to get anything it touches below -25C. How quickly it gets there is quite another story, yes? Since we wish to stay warm, 'wind chill' just removes heat faster like having a larger delta-T would. It is the convective coefficient that is modified by air motion... :)

Douglas
 

Fahrvegnugen

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Joined
Jan 21, 2017
Location
Burlington Vt
TDI
01 golf 1.9 alh gls silver
I like knowing the wind chill because I can calculate how many minutes I can be in a given temperature before having to remove myself from it. Many people don't have to be out for any amount of time to even worry about the temperature or get fully dressed. The chart is really useful and is what determines whether schools close etc. It is very dangerous to be ignorant of wind chill or temperature if you must be in it all day.
 

KLXD

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Aug 22, 2009
Location
Lompoc, CA
TDI
'98, '2 Jettas
They use wind chill because it's a gee-whiz number that's lower than the actual temp. I remember back in the deeps of time when they first started reporting it.

I think even idiots know they need to wear more clothing when it's windy.
 

wonneber

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Joined
Oct 12, 2011
Location
Monroe, NY, USA
TDI
2014 Jetta Sportwagon,2003 Jetta 261K Sold but not forgotten
I always thought wind chill was how a human thinks it feels like.
Running into the wind feels colder.
The radiator will dissipate the heat faster but the car does not feel it as such.
Just my 2 cents (US)
;)
 
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