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A/C drop out. High pressure
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C.French145
 


Member Since: 14 May 2023
Location: South Lanarkshire, Scotland
Posts: 109

Scotland 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Mariana BlackDiscovery 4
A/C drop out. High pressure

Hi all,

Yesterday my AC lost its chill. I use the AUTO function all the time with no issues. Yesterday I went to the shops and waited in the car with the AC on with engine running to keep cool. It’s was about 25 degrees. I then drove round to pick up the other half, but 5 minutes after they opened and closed the door, it became very muggy. Then the AC was trying to blow harder to reduce the temp.

Plugged GAP in and no faults.

Today I went out to check the valve. I had good pressure with oil a good squirt of oil. I then turned over the engine to find the AC chilly again.

Any ideas what could have caused this.
 Craig.


~~~~~~~~~~~~~~~~~~

Current -
Discovery 4, 2015 HSE Lux. SDV6.
Previous -
D2 2003 TD5.
110 1997 300tdi. 


Last edited by C.French145 on 6th Aug 2024 10:27 am. Edited 1 time in total 
Post #234559020th Aug 2023 11:28 am
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C.French145
 


Member Since: 14 May 2023
Location: South Lanarkshire, Scotland
Posts: 109

Scotland 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Mariana BlackDiscovery 4

Hi all,

Bringing this back up. So since this post, I have had the AC drop out twice again. But,
I have had the rear ac pipes replaced and all has been well.

I have noticed that my condenser dryer is leaking. I aim to replace it tomorrow.

But, I have been doing a lot of research regarding the AC system as the system cut out twice in the hot weather. I assumed from the refrigerant leak. But now the weather is pants again, it’s been working fine again.

My AC pressure readings have been really high (I assumed higher the better). They have been 290-300 psi. I have now realised that this isn’t good. It’s far too high. So has my AC been cutting out as an over pressure in the hot weather. Protecting the system??
Click image to enlarge
 Craig.


~~~~~~~~~~~~~~~~~~

Current -
Discovery 4, 2015 HSE Lux. SDV6.
Previous -
D2 2003 TD5.
110 1997 300tdi. 
 
Post #23745584th Aug 2024 8:09 pm
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Worms
 


Member Since: 24 Sep 2023
Location: Highlands
Posts: 360

Scotland 2005 Discovery 3 TDV6 Base 7 Seat Auto Zambezi SilverDiscovery 3

Lol, shows how often we need the A/C in Scotland when this is a problem twice in two years! Laughing

I have something similar, except in mine it is the blower motor that just stops responding. Ignition off and on resolves it, but no fault is reporting on the GAP Tool.
 Previously:
2010 FL2 TD4e GS
‘93 Defender 110 200TDi CSW - still got this, non-runner on SORN.
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel 
 
Post #23745795th Aug 2024 6:46 am
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C.French145
 


Member Since: 14 May 2023
Location: South Lanarkshire, Scotland
Posts: 109

Scotland 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Mariana BlackDiscovery 4

Well, I have just had 660g extracted. From the 910 I had 3 months ago. So I still had plenty of gas! Lets get stuck into the condenser replacement.
 Craig.


~~~~~~~~~~~~~~~~~~

Current -
Discovery 4, 2015 HSE Lux. SDV6.
Previous -
D2 2003 TD5.
110 1997 300tdi. 
 
Post #23745975th Aug 2024 10:49 am
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C.French145
 


Member Since: 14 May 2023
Location: South Lanarkshire, Scotland
Posts: 109

Scotland 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Mariana BlackDiscovery 4

Hi all,

So I have replaced the condenser and regassed.

I had concerns over really high AC pressures seen above. Research says that it could be faulty condenser.

But after a regass this morning, the initial pressure in the garage was nearly 290psi! As I drove it dropped to 125-150 psi. As I pulled up to my destination, I noticed it creeping back up to 170psi.

I get good cold air, but why is my pressures so high when stationary? Or is this normal. Viscous fan seems to be working.

Thanks.
 Craig.


~~~~~~~~~~~~~~~~~~

Current -
Discovery 4, 2015 HSE Lux. SDV6.
Previous -
D2 2003 TD5.
110 1997 300tdi. 
 
Post #23746606th Aug 2024 10:22 am
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C.French145
 


Member Since: 14 May 2023
Location: South Lanarkshire, Scotland
Posts: 109

Scotland 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Mariana BlackDiscovery 4

Viscous fan has resistance when engine off. Can move with my fingers, but won’t freely spin on its own momentum? Is that normal?
 Craig.


~~~~~~~~~~~~~~~~~~

Current -
Discovery 4, 2015 HSE Lux. SDV6.
Previous -
D2 2003 TD5.
110 1997 300tdi. 
 
Post #23746616th Aug 2024 10:26 am
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riverblanche
 


Member Since: 31 Aug 2010
Location: retford'ish
Posts: 2222

England 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Hi,

have tried to find the details I used when I had a leak on my Aircon but sadly not found the details yet Embarassed

there is a table of pressures and temps you can see with the IID I was surprised how much difference there was in pressure depending what the outside temp was.

will have another search but if you have not seen something like that, there is a scale (somewhere Question )

Thumbs Up

mine turned out to be a leaking condenser
.

Another search and think it was Flatlanders post I was using if this helps any Thumbs Up
https://www.disco3.co.uk/forum/topic201323...ssure+temp

.
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Another Porsche Cayenne 2022
Gone Porsche Cayenne 2020
Gone RRS HSE Dynamic 2016
Gone RRS HSE LUX 2011
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Gone D3 SE 2.7 2008
gone D2 Td5 1999

I plan on living forever and so far so good !

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Post #23746766th Aug 2024 6:41 pm
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sailormike
 


Member Since: 04 Apr 2007
Location: Norfolk
Posts: 176

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Waitomo GreyDiscovery 4

May be worth checking the condenser fins are clean, the condenser cools the refrigerant gas down turning it into a liquid. This cooling process is what takes the heat out of the car / system. If it is not cooling down correctly the system pressures will be higher.

May be worth a quick wash from a pressure washer.
 Disco 4
Burstner motorhome
BMW 225e (only 1/2 way to electric) 
 
Post #23746806th Aug 2024 9:30 pm
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