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Aircon: High Idle??
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robpenrose
 


Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2136

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4
Aircon: High Idle??

Has anyone noticed this before or is it an issue:

Noticed over the weekend when I was out and about that sometimes when using the aircon in Auto mode, when I selected Neutral while waiting at lights etc, that the idle sat at around 1000 rpm. At one point I noticed it as high as 1100ish. I noticed if I turned the A/C off, it dropped to its normal 800rpm ish.

AC all operated properly, car ran fine in gear etc with nothing different and no errors displayed.

Outside temp ranges from 29-33 on the dash display and I had the inside set at around 20 ish. Is this normal, and just the engine putting the idle up to compensate for a high load from the AC?

Thanks
 

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Post #182872420th Jun 2017 2:10 pm
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Admirable
 


Member Since: 19 Jul 2015
Location: Fife
Posts: 1007

Ukraine 2007 Discovery 3 TDV6 XS Auto Zermatt SilverDiscovery 3

The engine revs will increase to compensate for the load placed by the air con compressor
  
Post #182873620th Jun 2017 2:44 pm
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Gareth
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Member Since: 07 Dec 2004
Location: Bramhall
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United Kingdom 

Completely normal. Thumbs Up
  
Post #182876220th Jun 2017 3:52 pm
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robpenrose
 


Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2136

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

Thanks chaps. Never seen it before. Has been very hot here over the last few days though Thumbs Up
 

Current: D4 HSE
Previous: BMW Z4M Coupe
Previous: Land Rover Defender 90 CSW Td5
Previous: Land Rover Discovery Td5 ES 
 
Post #182876620th Jun 2017 3:58 pm
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dgardel
 


Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025

Italy 2014 Discovery 4 3.0 SDV6 XXV LE Auto Santorini BlackDiscovery 4

I did the same question the past summer (first summer with my D4)...

yes it's normal Mr. Green
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Post #182879820th Jun 2017 6:09 pm
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robpenrose
 


Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2136

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

Thanks man. I did a search, but nothing came up Thumbs Up

Never saw it happening last summer which is why I wasn't sure!
 

Current: D4 HSE
Previous: BMW Z4M Coupe
Previous: Land Rover Defender 90 CSW Td5
Previous: Land Rover Discovery Td5 ES 
 
Post #182881620th Jun 2017 6:48 pm
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Adiver
 


Member Since: 18 Jan 2006
Location: Rutland
Posts: 491

England 2012 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Mine did this over the last couple of days too! Glad to have it confirmed as normal
Thanks Guys
Jon
 D4 SDV6 HSE  
Post #182881820th Jun 2017 6:53 pm
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Gayathra
 


Member Since: 28 Jul 2018
Location: Sri Lanka
Posts: 6

2014 Discovery 4 3.0 SDV6 SE Tech Auto Corris GreyDiscovery 4

I bought my vehicle when it had 93000km on the clock and from the day that I've bought it when I put it into neutral or into park the rpm rises to 1100 (with a/c on) and when putting it into drive it comes back closer to 800rpm but my friend has a 2011 Discovery 4 SDV6 HSE (stick shift 6 speed) and his vehicle always stays closer to 800rpm whether it is in drive, neutral or park always (with a/c on) and mileage of his vehicle is 55000km. The differences between the two vehicles are only the gearbox and mileage. Can anybody please explain the reason behind different idle rpms in identical vehicles?

My Vehicle : 2014 Discovery 4 SDV6 SE Tech (8 Speed-Rotary Shift), at the moment 105000km on the clock.

Thanks.
  
Post #196844728th Jul 2018 6:19 pm
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robpenrose
 


Member Since: 12 Jan 2016
Location: Surrey / SW London
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United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

Well mine is a 6 speed. Thumbs Up
 

Current: D4 HSE
Previous: BMW Z4M Coupe
Previous: Land Rover Defender 90 CSW Td5
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Post #196899330th Jul 2018 1:37 pm
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Gayathra
 


Member Since: 28 Jul 2018
Location: Sri Lanka
Posts: 6

2014 Discovery 4 3.0 SDV6 SE Tech Auto Corris GreyDiscovery 4

My concern is if my friends vehicle can take the load of the air con at 800rpm (at idle) why does my vehicle can't take the load of the air con by keeping the rpm at 800rpm without increasing it to 1100rpm (at idle).

In both the vehicles air con temp was set to 19°C and same blower speed was selected (One step).

Outside temp = (30-35°C)
  
Post #196903830th Jul 2018 3:58 pm
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Erea
 


Member Since: 19 Mar 2012
Location: Munster
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Ireland 2006 Discovery 3 TDV6 Commercial Manual Zambezi SilverDiscovery 3

Aircon also ups the revs at idle on my 2006 D3.
  
Post #196904430th Jul 2018 4:52 pm
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kajtzu
 


Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6538

Finland 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

It does the same on a D3 V8 - normal idle rpms are ~650. In 30C heat and AC on at start it’ll increase to 1100-1200 rpms at idle. Rpms drop instantly to normal if I turn AC/fans off.
  
Post #196905530th Jul 2018 5:27 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
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Ukraine 

Haven’t noticed it doing this on mine, even in N or P waiting at local level crossing at 35c. And was deffo working. Thumbs Up
   
Post #196905630th Jul 2018 5:29 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8044

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Gayathra wrote:
I bought my vehicle when it had 93000km on the clock and from the day that I've bought it when I put it into neutral or into park the rpm rises to 1100 (with a/c on) and when putting it into drive it comes back closer to 800rpm but my friend has a 2011 Discovery 4 SDV6 HSE (stick shift 6 speed) and his vehicle always stays closer to 800rpm whether it is in drive, neutral or park always (with a/c on) and mileage of his vehicle is 55000km. The differences between the two vehicles are only the gearbox and mileage. Can anybody please explain the reason behind different idle rpms in identical vehicles?

My Vehicle : 2014 Discovery 4 SDV6 SE Tech (8 Speed-Rotary Shift), at the moment 105000km on the clock.

Thanks.


It’s all about efficiency and possibly later software, not just for the air con but also for the viscous fan working at max keeping the engine temp down when stationary.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #196906930th Jul 2018 5:55 pm
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dgardel
 


Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025

Italy 2014 Discovery 4 3.0 SDV6 XXV LE Auto Santorini BlackDiscovery 4

Gayathra wrote:
I bought my vehicle when it had 93000km on the clock and from the day that I've bought it when I put it into neutral or into park the rpm rises to 1100 (with a/c on) and when putting it into drive it comes back closer to 800rpm but my friend has a 2011 Discovery 4 SDV6 HSE (stick shift 6 speed) and his vehicle always stays closer to 800rpm whether it is in drive, neutral or park always (with a/c on) and mileage of his vehicle is 55000km. The differences between the two vehicles are only the gearbox and mileage. Can anybody please explain the reason behind different idle rpms in identical vehicles?

My Vehicle : 2014 Discovery 4 SDV6 SE Tech (8 Speed-Rotary Shift), at the moment 105000km on the clock.

Thanks.


Gayathra,

again! my old MY2011 D4 HSE Lux done this and my new to me 2014 D4 XXV do the same (both when the ext temp is more tha 30°C).

So, assuming that your friend's D4 does not do it, the anomaly is that vehicle, not yours ....
 Discovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition

IID Pro MV License

 
 
Post #196907430th Jul 2018 6:11 pm
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