Recent Topics
Clean thick oil in throttle body?!
by 19jacobob93
10/25/14 12:57 AM
Auto Parts Store Selling More Oil Filters Now..
by crazyoildude
10/24/14 11:27 PM
Sun facts
by oilboy123
10/24/14 11:25 PM
Cooper Zeon RS3-A Long Term Impressions
by MCompact
10/24/14 11:01 PM
Desulfator built into battery charger do they work
by Crankytank
10/24/14 10:47 PM
what are you guys flipping?
by Chris142
10/24/14 09:50 PM
Fram Ultra low prices at Rockauto $6.76
by 901Memphis
10/24/14 09:35 PM
mobil 1 vs castrol synthetic gear oil????????
by whitearrow
10/24/14 09:30 PM
5.7L Hemi Ram 1500 rod knock when cold
by butcherman
10/24/14 09:29 PM
Turbo 350 - DexIII or VI
by GSCJR
10/24/14 08:48 PM
94 Jaguar XJS 6.0 V12, 1400 mi, Unknown xW-30
by Wampahoofus
10/24/14 08:43 PM
Snow vs ice tire
by supton
10/24/14 08:35 PM
Newest Members
ChevyTwo, BrianPA, JeepCommander, hevslark, Hox
51688 Registered Users
Who's Online
25 registered (bobbydavro, 55Test, 901Memphis, Bill_G, berniedd, 2 invisible), 528 Guests and 193 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51688 Members
64 Forums
221173 Topics
3496890 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#1034319 - 11/24/07 11:57 PM How long must a block heater be plugged in for?
byez Offline


Registered: 10/21/07
Posts: 434
Loc: Canada,North America,Western H...
I guess it depends on how cold it is but how long does it take to actually make a difference? Would leaving it plugged in overnight cause any coolant breakdown?

Top
#1034386 - 11/25/07 07:43 AM Re: How long must a block heater be plugged in for [Re: byez]
va3ux Offline


Registered: 11/12/05
Posts: 963
Loc: Ontario, Canada
 Originally Posted By: byez
I guess it depends on how cold it is but how long does it take to actually make a difference? Would leaving it plugged in overnight cause any coolant breakdown?


The puny little 100-200 watt block heater is not capable of producing the temperatures that the engine produces during normal operation. You can't hurt the coolant with a block heater.

I leave mine plugged-in over night on the few really cold nights we get here in Southern Ontario. In colder parts of Canada, the engines are either running, or the block heater is plugged-in; nothing in between.

I have found that plugging the heater in for even 2 hours makes quite a difference. You could put it on a timer to turn on perhaps 2 - 3 hours before your first start in the morning.
_________________________
2001 Chrysler Intrepid 2.7L 505,000 km (313,000 miles) - now retired

2003 Kawasaki 1500 Mean Streak (50,000 km)

Top
#1034390 - 11/25/07 07:59 AM Re: How long must a block heater be plugged in for [Re: va3ux]
daman Offline


Registered: 09/23/06
Posts: 10486
Loc: Bad Axe, MI
Yup over night hurts nothing,there dsighned for that.
_________________________
"Always"....Mobil 1

Current fill: AFE 0w30

Top
#1034416 - 11/25/07 09:37 AM Re: How long must a block heater be plugged in for [Re: daman]
G-MAN Offline


Registered: 11/15/02
Posts: 8869
Loc: SC
In my experience, if you know it's going to be cold enough overnight to warrant the block heater, it's best to just plug it in as soon as you've parked the car/truck for good. That way the block heater is keeping the coolant warm, not trying to warm up ice cold coolant.
_________________________
2010 Audi A4 2.0T Quattro: RLI 5w40 HD Low Ash
2004 Ford Crown Vic: MaxLife 5w20

Top
#1034428 - 11/25/07 10:10 AM Re: How long must a block heater be plugged in for [Re: G-MAN]
NYEngineer Offline


Registered: 12/12/06
Posts: 1084
Loc: NY, NY
I would get one with a thermostat and set it up on a timer so it came on a few hours before you use the vehicle.

Top
#1034697 - 11/25/07 07:51 PM Re: How long must a block heater be plugged in for [Re: NYEngineer]
pepper32 Offline


Registered: 06/01/02
Posts: 341
Loc: fairbanks, alaska
Three hours minimum even at -50F.


Edited by pepper32 (11/25/07 07:52 PM)

Top
#1034706 - 11/25/07 08:11 PM Re: How long must a block heater be plugged in for [Re: G-MAN]
va3ux Offline


Registered: 11/12/05
Posts: 963
Loc: Ontario, Canada
 Originally Posted By: G-MAN
In my experience, if you know it's going to be cold enough overnight to warrant the block heater, it's best to just plug it in as soon as you've parked the car/truck for good. That way the block heater is keeping the coolant warm, not trying to warm up ice cold coolant.


That's exactly what I do when the real cold weather hits here. Only need to do it for 5 or 10 nights a year.
_________________________
2001 Chrysler Intrepid 2.7L 505,000 km (313,000 miles) - now retired

2003 Kawasaki 1500 Mean Streak (50,000 km)

Top
#1034708 - 11/25/07 08:13 PM Re: How long must a block heater be plugged in for [Re: va3ux]
TEMPESTboy Offline


Registered: 09/10/05
Posts: 14
Loc: Canada
I use a timer and have it turn on 2-3 hours before I have to leave in the morning. This is when it is -20 degrees Celsius and colder. Use a timer and save energy!

Top
#1034810 - 11/25/07 10:53 PM Re: How long must a block heater be plugged in for [Re: TEMPESTboy]
Towel_Rail Offline


Registered: 03/01/07
Posts: 289
Loc: Iowa
Until you start it?


Edited by Towel_Rail (11/25/07 10:54 PM)
_________________________
I am boxer, I contain multigrades.

Top