AC/Heater Heated Rear Window - Auto On? - Page 7

Dawson · 15th March 2008, 23:03

No - Jan 07 Civic Type S 2.2.
Will add that I've started it at as low as indicated -13c before, and it never cam on by default either. :S

TTDegs · 16th March 2008, 00:15

Quote:

Originally Posted by Dawson

No - Jan 07 Civic Type S 2.2.
Will add that I've started it at as low as indicated -13c before, and it never cam on by default either. :S

it looks like it should have done Dawson

ScubaSin · 16th March 2008, 01:24

Yes. Dec '07 2.2 Type S GT.

Anastie · 16th March 2008, 13:58

Yes 56 2.2 Sport.

Soichiro · 18th March 2008, 18:52

If the idea of the "Auto On" is to speed up engine warm up by making it work harder with an extra electrical load, why didn't Honda switch in the ceramic heater in the ventiation system instead. Then my feet would get warmer quicker!

Or they could have added an electric heater to the engine cooling circuit.

Both of these seem better than heating a bit of glass at the back of the car for 40 mins

Adrian Wood · 18th March 2008, 23:16

Nice reply. My wife's Puma gets the interior air warm far more quickly so that may be because power is not going to the rear windscreen

. Does burning diesel really make the engine that much less hot? I would have thought it might be , say, a 10c difference, but that might be 65 vs 75 degrees C so is that responsible for my 2.2 SE diesel still hardly getting to normal on the temperature scale if I drive from cold at a minus 2 temp for 6 miles?

Civic 2.2 diesel SE. Not very good with these gissmos and smileys but here is my first attempt

FWH · 19th March 2008, 02:38

Quote:

Originally Posted by Adrian Wood

Nice reply. My wife's Puma gets the interior air warm far more quickly so that may be because power is not going to the rear windscreen

. Does burning diesel really make the engine that much less hot? I would have thought it might be , say, a 10c difference, but that might be 65 vs 75 degrees C so is that responsible for my 2.2 SE diesel still hardly getting to normal on the temperature scale if I drive from cold at a minus 2 temp for 6 miles?

Civic 2.2 diesel SE. Not very good with these gissmos and smileys but here is my first attempt

Puma is a petrol?

Yes, due to the efficancy percentage of the fuel, a diesel will generate less heat.

Soichiro · 19th March 2008, 20:33

To be really concise.... or may be sad..

1; Diesel fuel has more energy per litre than petrol (this is where most of the extra mpg comes from)
2; Diesel engines run at about the same temperature as petrols, but thet use the fuel more efficiently ie more of the energy in the fuel is converted in to motion and less in to heat (this is where the rest of the extra mpg comes from)
3; diesel engines are made heavier and strong than petrol engine to cope with the extra loads caused by the massive compression ratios

This means as a diesel is warming up there is less waste heat being dumped in to the cooling water and there is more metal to warm up as well.

This means my feet are cold but my wallet is a bit fuller

madasadad · 26th March 2008, 08:58

Yes, 07 2.2 ES

Dalboy · 26th March 2008, 09:27

No 1.8 EX March 07

jamo9017 · 26th March 2008, 09:38

No mine doesn't 57 plate 1.4 se

GHGH · 26th March 2008, 09:54

What is the effect of the heating?

The efficiency of the diesel engine is ca 40%(?), meaning that ca 60% of the combusted diesel goes to heating of the engine.
Which again should imply that for each watt of rear window heating, the engine will produce 1,5 watt of internal heat.

bigal · 28th March 2008, 16:13

yes,06 2.2 se

joonyar · 28th March 2008, 16:45

Yeah, 56 ES

smurf79 · 30th March 2008, 09:01

yes. july 07 2.2 SE

ATmega168 · 31st March 2008, 11:09

Yes, Sep '57 2.2 ES

cnicolini · 31st March 2008, 14:43

No, CTR Sept 2007

Coldwarkid · 1st April 2008, 17:56

No, 08 1.8 ES.

Asked the dealer and they said it didn't come on automatically.

Dawson · 1st April 2008, 19:23

Mine definately doesn't come on - Jan 2007 2.2 Type S.

However, i've had a thought. I never have the temp on Auto - i manually set the temp and the fan speed myself. Could it be that it only comes on when Auto is turned on?

Edit: Just read that when it's on the light on the button doesn't come on. In that case, it probably does do it, just I don't know about it.

scrofts007 · 19th April 2008, 14:50

No - definitely doesn't. Climate set to Auto

. 2.2 EX. April 08.

View Poll Results: Does your rear window defrost on cold mornings ALL BY ITSELF?
Yes, mine auto defrosts the HRW	94	42.15%
No, mine doesn't	88	39.46%
Not sure, hasn't been cold recently!	33	14.80%
Multiple Choice Poll. Voters: 223. You may not vote on this poll \| Withdraw Vote

15th March 2008, 23:03	#121 (permalink)
Dawson Locking Wheelnut Join Date: 7th December 2006 Location: Turriff Posts: 196 Thanks: 0 Thanked 0 Times in 0 Posts	No - Jan 07 Civic Type S 2.2. Will add that I've started it at as low as indicated -13c before, and it never cam on by default either. :S Last edited by Dawson; 15th March 2008 at 23:07.

18th March 2008, 23:16	#126 (permalink)
Adrian Wood Valve Cap Join Date: 9th July 2007 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	Auto heater Nice reply. My wife's Puma gets the interior air warm far more quickly so that may be because power is not going to the rear windscreen. Does burning diesel really make the engine that much less hot? I would have thought it might be , say, a 10c difference, but that might be 65 vs 75 degrees C so is that responsible for my 2.2 SE diesel still hardly getting to normal on the temperature scale if I drive from cold at a minus 2 temp for 6 miles? Civic 2.2 diesel SE. Not very good with these gissmos and smileys but here is my first attempt

31st March 2008, 11:09	#136 (permalink)
ATmega168 Supporter Valve Cap Join Date: 15th February 2008 Location: North Wales Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Yes, Sep '57 2.2 ES Last edited by ATmega168; 31st March 2008 at 15:24.

1st April 2008, 19:23	#139 (permalink)
Dawson Locking Wheelnut Join Date: 7th December 2006 Location: Turriff Posts: 196 Thanks: 0 Thanked 0 Times in 0 Posts	Mine definately doesn't come on - Jan 2007 2.2 Type S. However, i've had a thought. I never have the temp on Auto - i manually set the temp and the fan speed myself. Could it be that it only comes on when Auto is turned on? Edit: Just read that when it's on the light on the button doesn't come on. In that case, it probably does do it, just I don't know about it. Last edited by Dawson; 1st April 2008 at 19:25.


This thread is about: Heated Rear Window - Auto On?, it's in Electronics at the Honda Civic forum Civinfo; No - Jan 07 Civic Type S 2.2. Will add that I've started it at as low as indicated -13c before, and it never cam ...

16th March 2008, 01:24	#123 (permalink)
ScubaSin Valve Cap Join Date: 3rd March 2008 Location: Sheffield, UK Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	Yes. Dec '07 2.2 Type S GT.

16th March 2008, 13:58	#124 (permalink)
Anastie Valve Cap Join Date: 16th September 2007 Location: Northumberland Posts: 43 Thanks: 0 Thanked 0 Times in 0 Posts	Yes 56 2.2 Sport.

18th March 2008, 18:52	#125 (permalink)
Soichiro Wheelnut Join Date: 27th June 2007 Location: Lincolnshire Posts: 55 Thanks: 0 Thanked 0 Times in 0 Posts	If the idea of the "Auto On" is to speed up engine warm up by making it work harder with an extra electrical load, why didn't Honda switch in the ceramic heater in the ventiation system instead. Then my feet would get warmer quicker! Or they could have added an electric heater to the engine cooling circuit. Both of these seem better than heating a bit of glass at the back of the car for 40 mins

19th March 2008, 20:33	#128 (permalink)
Soichiro Wheelnut Join Date: 27th June 2007 Location: Lincolnshire Posts: 55 Thanks: 0 Thanked 0 Times in 0 Posts	To be really concise.... or may be sad.. 1; Diesel fuel has more energy per litre than petrol (this is where most of the extra mpg comes from) 2; Diesel engines run at about the same temperature as petrols, but thet use the fuel more efficiently ie more of the energy in the fuel is converted in to motion and less in to heat (this is where the rest of the extra mpg comes from) 3; diesel engines are made heavier and strong than petrol engine to cope with the extra loads caused by the massive compression ratios This means as a diesel is warming up there is less waste heat being dumped in to the cooling water and there is more metal to warm up as well. This means my feet are cold but my wallet is a bit fuller

26th March 2008, 08:58	#129 (permalink)
madasadad Supporter Triangular Exhaust Join Date: 21st February 2007 Location: Carrickfergus Posts: 272 Thanks: 0 Thanked 0 Times in 0 Posts	Yes, 07 2.2 ES

26th March 2008, 09:27	#130 (permalink)
Dalboy Supporter Triangular Exhaust Join Date: 21st January 2007 Location: Worcestershire Posts: 343 Thanks: 0 Thanked 0 Times in 0 Posts	No 1.8 EX March 07

26th March 2008, 09:38	#131 (permalink)
jamo9017 Supporter Locking Wheelnut Join Date: 25th November 2007 Location: manchester Posts: 112 Thanks: 0 Thanked 0 Times in 0 Posts	No mine doesn't 57 plate 1.4 se

26th March 2008, 09:54	#132 (permalink)
GHGH TANSTAAFL! Magic Rear Seat Join Date: 13th March 2007 Location: Trondheim, Norway Posts: 920 Thanks: 0 Thanked 0 Times in 0 Posts	What is the effect of the heating? The efficiency of the diesel engine is ca 40%(?), meaning that ca 60% of the combusted diesel goes to heating of the engine. Which again should imply that for each watt of rear window heating, the engine will produce 1,5 watt of internal heat.

28th March 2008, 16:13	#133 (permalink)
bigal Wheelnut Join Date: 4th July 2006 Location: scotland Posts: 64 Thanks: 0 Thanked 0 Times in 0 Posts	yes,06 2.2 se

28th March 2008, 16:45	#134 (permalink)
joonyar Valve Cap Join Date: 29th July 2007 Location: Bonnie Scotland Posts: 32 Thanks: 0 Thanked 0 Times in 0 Posts	Yeah, 56 ES

30th March 2008, 09:01	#135 (permalink)
smurf79 Supporter Triangular Exhaust Join Date: 10th August 2007 Location: Bolton, England Posts: 289 Thanks: 1 Thanked 8 Times in 7 Posts	yes. july 07 2.2 SE

31st March 2008, 14:43	#137 (permalink)
cnicolini Triangular Exhaust Join Date: 15th August 2007 Location: Hertfordshire Posts: 483 Thanks: 0 Thanked 4 Times in 4 Posts	No, CTR Sept 2007

1st April 2008, 17:56	#138 (permalink)
Coldwarkid Locking Wheelnut Join Date: 5th February 2008 Location: A van down by the river Posts: 158 Thanks: 0 Thanked 0 Times in 0 Posts	No, 08 1.8 ES. Asked the dealer and they said it didn't come on automatically.

19th April 2008, 14:50	#140 (permalink)
scrofts007 Supporter Valve Cap Join Date: 19th April 2008 Location: Derbys Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts	No - definitely doesn't. Climate set to Auto . 2.2 EX. April 08.

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