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Heater no hot air B1B78-84
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Connor-832
 


Member Since: 30 Aug 2021
Location: Cheshire
Posts: 13

United Kingdom 2005 Discovery 3 TDV6 S Auto Zambezi SilverDiscovery 3
Heater no hot air B1B78-84

Hi,

Recently with the weather I have noticed the heater in my discovery 3 not working at all! I have plugged in my scanner and the fault code has flagged up B1B78-84 (System pressure). I've had a look around and most posts with the same code show I need the AC recharged which is likely fas it hasn't been done in a while, however I can't understand why this affects the blower from producing hot air.

Am I going down the right track, if so can somebody explain why or could it be something completley different?

Thanks in advance.

Connor.  
Post #22609728th Nov 2021 7:42 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10637

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Unrelated.

If you get air but it’s cold then probably blocked matrix.  
Post #22609828th Nov 2021 8:17 pm
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Connor-832
 


Member Since: 30 Aug 2021
Location: Cheshire
Posts: 13

United Kingdom 2005 Discovery 3 TDV6 S Auto Zambezi SilverDiscovery 3

Hi, thanks for the reply!

I've had a chance today to flush the system and bleed with new antifreeze, still no hot air though with the same fault codes! Any other ideas on what it could be?

Thanks

Connor  
Post #22611869th Nov 2021 9:33 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10637

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

They are very difficult to flush, as the dirt can’t go up hill.

Someone did have success removing the matrix via the drivers footwell and flushing.
You need to check you have the pipes you can disconnect under the dash  
Post #22611989th Nov 2021 10:19 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10637

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Similar to this

https://www.rrsport.co.uk/forum/topic42040.html  
Post #22612019th Nov 2021 10:23 pm
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Motolab
 


Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820

Netherlands 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Welcome! Best regards
Harold

Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year

Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. Wink  
Post #22612029th Nov 2021 10:46 pm
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ianm27
 


Member Since: 02 Jun 2016
Location: Hertfordshire
Posts: 2154

England 2012 Discovery 4 3.0 SDV6 GS Auto Orkney GreyDiscovery 4

Hi Conner - does sound like your heater matrix is fubared (technical term Whistle )

As Pete mentioned it is possible to flush the matrix but not always successful. Time to dismantle the dash and fit a new matrix

This maybe useful - https://www.disco3.co.uk/forum/disco-3-tem...85501.html Uncle Ray's spare wheel protector
Limo Tint
Blackvue front & rear dashcam
Cruise control switch pack
Bodsy's remote for FBH  
Post #226132110th Nov 2021 5:03 pm
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