Hi guys, really need some help. 

 My air con on my 2010 Octavia scout wasn’t working so I had it re gassed... worked fine for half an hour then slowly went warm (outside temp) so took car back to air con place who tested and checked for leaks again and told me it was fine but re filled with air con gas etc and even a bit extra to make sure it was in the max for pressure, again all was fine for half an hour then it went warm (outside temp) zoom down the motorway and it seems to work and get ice cold... so after all sorts of checks by myself I changed the climate control panel, the sun thing in the widow screen, all temp sensors on the pipe ducting, Infact changed everything possible all from vehicles that I tested and worked fine ice cold but still NO joy with mine. I did notice that my radiator fan pack wasn’t spinning fast at all for air con so again I changed the full rad pack fan assembly unit and STILL same problem. I use my snap on solus pro diagnostic machine and there’s NO fault codes, it says on live data that air con fan is asking for 100% fan speed but it’s not getting it for air con.  I’m at my wits end and now the weather is getting hotter I’d really like to find the cause, I’ve changed and replaced all sorts AND checked the air con pump itself as I no they suffer from centre bolt issues but mine seems fine, actual air con pressure is fine... I’m already bald but seriously pulling my beard hairs out now. Any help would be greatly appreciated, 

thank you. 

   P.S mine is the silver one... de-commissioned Rapid responce vehicle (paramedic car) 

 all parts that I’ve swapped and changed are from the rest of the fleet. 

I own the company who does the servicing, wiring repairs, Bluelight conversion etc etc. 

Edited 17 May, 20197 yr by Mick562008

Personally, I think you are barking up the wrong tree with the rad fans, they do not spin ridiculously fast. The only time you get the larger of the fans spinning at full speed sometimes is when the smaller fan fails.

 

You are in need of some VCDS diagnostics to look at the compressor duty, any shut off codes, evap temps etc. that will tell you what's gong on.

 

Also, the fact that this 'air-con' place has added a little extra gs rings alarm bells to me, it either has the right amount of refrigerant in it or it hasn't, just putting more in than required will make it perform worse not better. Did they use an automated machine to put in?

I agree totally, having spent a couple of months on the same journey with both a manifold guage test set and VCDS the second paragraph above is spot on, VCDS will get you to the bottom of it.

 

After changing G65 sensors and fitting a couple of compressor control valves I finally had to change the compressor to get my second stage to pressurise, even after stripping the old one I could not find the fault, it looked as good as new but the cheapo Chinese compressor is now delivering the goods.

 

With VCDS any shut down codes will tell you why the compressor is not being asked to pump, if there are none and the pressure is good in the first circuit but does not rise in the secondary one then its worth either declagging or replacing the compressor control valve (check wiring and connections) it will cost you a recharge, if that does not work then its replace the compressor as I had to.

As above really, mine went 3 years ago, had gas in, just would not work, checked compressor shut off codes and they were fine.

 

In the end it was the N280 valve on the compressor, so I had to change the compressor, worked a treat ever since, oh and they recommend changing the condenser too, cos you can't get the dryer pack if you have the condenser with the plastic nut.

 

Hope this helps,

 

Trev

You can buy the N280 valves now but it didnt make any difference in my case, a compressor change did, the valves seemed to be actioning correctly on the test bench and when connected to the wiring loom so what the fault was remains a mystery.

 

I did not replace my condensor and took a chance, the system had always been pressurised and the fluid was spotless, insides of the pump like new, lines were only open to atmosphere for a few minutes, its working OK for now.

 

N280 valves can be removed in situ without disturbing or removing the compressor, some aircon guys have an emulator which plugs onto the valve to action it which is a very good diagnostic tool if anything upstream is preventing it from working, damaged wiring etc or Climatronic fault, if I had one I could have properly tested my valves, I reckon cleaning the old one didnt work and the new one from China of course didnt either as one of the new G65 sensors didnt work either.

 

in the end the new pump was only £120 delivered and it was costing me €60 each recharge.

Edited 17 May, 20197 yr by J.R.

Like the other two posts above mine was the compressor, no shut off codes so the N280 valve was suspect but I went with a new pump. As already posted, VCDS and a bit of investigation is required to avoid unnecessary expense. 

Hi folks. I have a similar problem with the airconditioning in my 2007 Scout.

 

Before I begin, this has all been checked out using VCDS (thank you nopowerman!) before, during and after exhibiting these symptoms, and no fault codes showed up. I have used the Climatronic hidden information menu to check values.

 

About 3 weeks ago the car had a re-gas which was prompted by lack of low vent temperatures and some oddly abrasive noises when the aircon was previously operating. After checking searching this forum, I went for a refill. No leaks were found but I wasn't charged because there was insufficient improvement in cooling performance according to the company policy (ATS). I was told that although it was leak-free and had filled correctly, there was a fault somewhere in the system that prevented it from operating correctly, suggesting a fault with a sensor, valve or the compressor. They didn't say how much residual coolant they had pulled out.

 

So, despite the requested temperature being set to LO, ECON definitely OFF, and the ventilation fan set at maximum (engine running), the output temperature of the Climatronic on my Scout oscillates between cold (can be as low as 10-12degC, what I'd expect it to be, but often only dips to mid-teens) and not cold (a value that can be dependent on the outside temperature) according to what can be felt at the vents, and confirmed by menu items 6-2 or 8-2 (LHS and RHS vents), . The rate and duration of temp change varies, as does the time spent at the extremes.

Whilst the temperature is cold, I have noticed that system pressure value (menu item 10-1) has increased to between 9 and 11bar. When the temperature increases, the pressure has dropped to 6-7 bar.

 

Compressor speed (19-4) seems consistent at engine speed + a bit (value 10 at 800rpm tickover, increases according to rpm). The compressor code (11-6) always shows 00.

 

Some odd values I noticed earlier from the hidden menu:

4-2 (External Temperature, Temperature Intake degC)) 63.5  - this when MFD showed 22.5, as did 4-0 (Ext. Temp, Temperature External degC) and 4-1 (Ext. Temp, Temp Ext CANBUS). It was hot in the car at that time, but not 63degC hot!

17-0 (Temperature Internal Recirculation, Setpoint Value %) flashed alternately between 00 and 001 (small 'one'), as did 21-1 (Air Distribution, Face %), 21-4 (Re-circulated %), and 21-5 (Air Sensor %).

 

I've also noticed when checking this out with the bonnet up that the condensor fan doesn't seem to run very often, but when it does, it only seems to run at full speed. The temperature vent output temp drops accordingly when the fan is running.

 

I'm hoping that knowledgeable peeps on here will be able to offer explanations as to why particular components/faults should be considered/excluded as the cause of the problem, and how I can check. Other than the refill, I haven't replaced anything yet, as I'm hoping the collective Brisky wisdom might point me in the right direction before I spend what little spare cash I have on the wrong thing.

 

I've surfed this site a fair bit in search of answers, but my specific set of symptoms has eluded me and I don't have a clear idea about how to proceed. Potential culprits seem to include (but are not limited to): Pressure sensor; pressure regulating valve; fan controller; various temperature sensors; low coolant level/pressure; compressor central shaft loosening/failure; compressor seal wear; ...... BTW, which is the compressor manufacturer to avoid?

 

I have full data from the hidden menu (taken earlier today), and the log summary from the VCDS scans if it would help to post those.

 

I look forward to your suggestions .

 

 

Edited 19 August, 20196 yr by tintinandcharlie
Spelling! and extra questions...

Please post the VDCS log, I may be able to help, I have VDCS and in MK so not that far if you fancy a trip up?.

 

I have never used the "hidden" menu, I just go for the jugular and connect the computer run a few output tests and alike, and 99% I'm stop on, well I'm a technician after all, so it dose help.

 

Hope this helps,

 

Trev

Hope this helps. I thinks it's only a summary though (it doesn't show values), but I may be able to get a more detailed scan through nopowerman if you give me a clue what to ask for specifically, or I might come up to you when that's convenient to you. Thank you for the offer. I'm assuming we need to go further into Address 08: Auto HVAC ?

 

Thanks for your help, BTW.

Also linked to this post:

 

Friday,16,August,2019,19:03:34:04209
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 19.6.0.2 (x64)  HEX-V2 CB: 0.4508.4
Data version: 20190529 DS308.0
www.Ross-Tech.com

VIN: TMBKE21Z978031410   License Plate: (omitted)
Mileage: 168120km-104464mi   Repair Order:

Chassis Type: 1Z (1K0)
Scan: 01 03 08 09 15 16 17 19 22 25 42 44 46 52 55 56 62 69 72 76
         

VIN: TMBKE21Z978031410   Mileage: 168120km-104464miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
22-AWD -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
69-Trailer -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 03G-906-021-BMM.clb
   Part No SW: 03G 906 021 MD    HW: 03G 906 021 AB
   Component: R4 2,0L EDC G000SG  9095  
   Revision: --H06---    Serial number: SKZ7Z0G4140691
   Coding: 0000172
   Shop #: WSC 25014 576 104585
   VCID: 6D84C092C190F97F117-8038

No fault code found.
Readiness: 0 0 0 0 1

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels:. 1K0-614-517-MK60AT.clb
   Part No SW: 1K0 614 517 AD    HW: 1K0 614 517 AD
   Component: ESP 4MOTION MK60-AT 0102  
   Revision: 00H14001    
   Coding: 0023170
   Shop #: WSC 25014 576 87181
   VCID: 698CB482F578E55F7DF-803C

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 1K0-907-044.lbl
   Part No SW: 1Z0 907 044 M    HW: 1Z0 907 044 M
   Component: ClimatronicPQ35 110 0400  
   Revision: 00110021    Serial number: 00000000000000
   Shop #: WSC 00000 000 00000
   VCID: 40DA4926A682C4178A1-8014

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 3C0-937-049-23-H.lbl
   Part No SW: 3C0 937 049 AE    HW: 3C0 937 049 AE
   Component: Bordnetz-SG     H52 2002  
   Revision: 00H52000    Serial number: 00000004773580
   Coding: E18A0F130004140040110D000000000000087F065C0000
   Shop #: WSC 25014 576 87181
   VCID: 6C82CD96FA8AF077069-8038

   Subsystem 1 - Part No: 1Z2 955 119 C  Labels: 1KX-955-119.CLB
   Component: Wischer 030307 022  0601  
   Coding: 00000001
   Shop #: WSC 25014  

   Subsystem 2 - Part No: 1K0 955 559 AB  Labels: 1K0-955-559-AF.CLB
   Component: RLS     090307 020  0105  
   Coding: 00471077
   Shop #: WSC 25014  

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 1K0-909-605.lbl
   Part No SW: 1K0 909 605 T    HW: 1K0 909 605 T
   Component: Q4 AIRBAG VW8   020 2300  
   Revision: 05020000    Serial number: 0038PD13XTSE  
   Coding: 0020788
   Shop #: WSC 73430 790 00000
   VCID: 3D2430D2D170A9FFE17-8068

   Subsystem 1 - Serial number: 6332MSME180D0A2CH

   Subsystem 2 - Serial number: 6342MSME142C3B7AM

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 1K0-953-549-MY8.lbl
   Part No SW: 1K0 953 549 AQ    HW: 1K0 953 549 AQ
   Component: J0527           036 0070  
   Coding: 0002042
   Shop #: WSC 73430 790 00000
   VCID: 015C8C22ED080D1FC5F-8054

   Subsystem 1 - Part No: XXXXXXXXXXX
   Component: E0221           002 0010

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 1K0-920-xxx-17.lbl
   Part No SW: 1Z0 920 942 D    HW: 1Z0 920 942 D
   Component: KOMBIINSTRUMENT VD1 1612  
   Revision: V1612036    Serial number: SKZ7Z0G4140691
   Coding: 0007402
   Shop #: WSC 45167 001 1048576
   VCID: 392C24C2C55895DFCDF-806C

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 1K0-907-530-V2.clb
   Part No SW: 1K0 907 530 K    HW: 1K0 907 951
   Component: J533__Gateway   H04 0021  
   Revision:   H04 02    Serial number: 160307F1001751
   Coding: FD3F474007002303
   Shop #: WSC 25014 576 87181
   VCID: 2F381A9A0B1C4B6F63B-807A

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 1K0-907-554.lbl
   Part No: 1K0 907 554 L
   Component: Haldex 4Motion      0116  
   Coding: 0000001
   Shop #: WSC 00000 000 00000
   VCID: 36362FFEF4467AA720D-8062

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No SW: 1Z0 920 942 D    HW: 1Z0 920 942 D
   Component: IMMO            VD1 1612  
   Revision: V1612036    Serial number: SKZ7Z0G4140691
   Shop #: WSC 00000 000 00000
   VCID: 392C24C2C55895DFCDF-806C

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels:. 1K0-959-701-MIN3.clb
   Part No SW: 1T0 959 701 D    HW: 1T0 959 701 D
   Component: Tuer-SG         005 0954  
   Coding: 0000758
   Shop #: WSC 73430 790 00000
   VCID: 382A21C6FE528CD7321-806C

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1Kx-909-144-G2V3.clb
   Part No: 1K2 909 144 L
   Component: EPS_ZFLS Kl.070 H07 1806  
   Shop #: WSC 25014 576 87181
   VCID: 353428F2E94071BF297-8060

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 1K0-959-433-MAX.clb
   Part No SW: 1K0 959 433 BT    HW: 1K0 959 433 BT
   Component:    KSG PQ35 G2  020 0203  
   Revision: 00020000    Serial number: 00000000000000
   Coding: 81801A085283007F3F02050FC0085F96907C00
   Shop #: WSC 10389 000 1048576
   VCID: 0350862AF7141F0FD73-8056

   Subsystem 5 - Part No: 1Z0 951 171
   Component: Innenraumueberw.008 4801  
   Coding: 00000000
   Shop #: WSC 10389  

   Subsystem 6 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HORN H03 1301

   Subsystem 7 - Component:       NGS n.mounted     

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MIN3.clb
   Part No SW: 1T0 959 702 D    HW: 1T0 959 702 D
   Component: Tuer-SG         005 0954  
   Coding: 0000758
   Shop #: WSC 73430 790 00000
   VCID: 392C24C2C55895DFCDF-806C

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 1T0-907-357.lbl
   Part No: 1T0 907 357
   Component: Dynamische LWR      0003  
   Coding: 0000008
   Shop #: WSC 73430 790 00000
   VCID: 74B2D5F6A2BA28B7DE9-8020

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 1K0-035-1xx-56.lbl
   Part No SW: 1Z0 035 161 C    HW: 1Z0 035 161 C
   Component: Radio FO3       019 0034  
   Revision: 00019000    Serial number: SKZ7Z3G0162453
   Coding: 0000402
   Shop #: WSC 73430 790 00000
   VCID: 2E06079E0C16426768D-807A

1 Fault Found:
00856 - Radio Antenna
            011 - Open Circuit

-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels:. 1K0-959-703-GEN3.clb
   Part No SW: 1K0 959 703 J    HW: 1K0 959 703 J
   Component: Tuer-SG         005 0907  
   Coding: 0000144
   Shop #: WSC 73430 790 1012544
   VCID: 372822FAF34C83AF3BB-8062

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer        Labels: 1K0-907-383-V1.clb
   Part No SW: 1K0 907 383     HW: 1K0 907 383
   Component: ANHAENGERELEKTR 001 0020  
   Coding: 0000001
   Shop #: WSC 25014 576 87181
   VCID: 6A8ECB8EF07EEE47745-803E

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels:. 1K0-959-704-GEN3.clb
   Part No SW: 1K0 959 704 J    HW: 1K0 959 704 J
   Component: Tuer-SG         005 0907  
   Coding: 0000144
   Shop #: WSC 73430 790 1012544
   VCID: 382A21C6FE528CD7321-806C

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 1Z0-919-283.lbl
   Part No SW: 1Z0 919 283 B    HW: 1Z0 919 283 B
   Component: Parkhilfe 4-Kan H04 0020  
   Coding: 0010011
   Shop #: WSC 73430 790 08192
   VCID: 3D2430D2D170A9FFE17-8068

No fault code found.

End----------(Elapsed Time: 01:17, VBatt start/end: 14.1V/14.2V)-----------

Edited 22 August, 20196 yr by tintinandcharlie

Hi tintinandcharlie,

 

That don't help, sorry, it's the measuring blocks you need, I will have to check what numbers you want, I know one is compressor shut off code, should be 0.0 and AC should be working, next one is compressor load, if that is low then the compressor is not working even though the shut off code says it is with 0.0, mine was like this, and it was the compressor that was goosed.

 

Like I said if you fancy a trip to Milton Keynes, I can do it for you and run some other tests too?

 

Hope this helps,

 

Trev

I have always thought that the compressor load was just a calculated figure based on the voltage applied to the N280 valve.

 

If you know otherwise and can give some details of what to look for, what are normal and abnormal readings I would really like to know, I have my second new compressor on the car and have recharged the system but think it needs one more can, output is OK but I think it could be colder, mpg seems lower than usual and I think the compressor could be working overtime.

 

any info gratefully recieved especially as to how it can measure the compressor load.

13 minutes ago, J.R. said:

I have always thought that the compressor load was just a calculated figure based on the voltage applied to the N280 valve.

 

 

They are my thoughts also as I can't really see how it would be able to measure it any other way.

 

@tintinandcharlie From what you have described, it sounds like mechanically your system is ok, when your compressor runs you are getting cold air, its almost like the climate is asking the compressor to turn off for whatever reason (could be in relation to temperature excursions from dodgy sensors maybe) but strangely your compressor shut off code remains at 0 which doesn't add up because all the various parameters for the compressor to turn off have their own code which sort of rules out it being the climate in its own right.

 

Just off the top of my head my head i think if it was my car my next step would be to prove the drive signal for the N280 valve, if you lose the signal when the aircon stops working at least you can rule that out and start looking at the climate

 

 

 

 

 

 

When mine packed up, no fans were working, only for engine temp. Shut off code was 0.0, so as far as the HVAC ECU was concerned it was working ok, but I knew otherwise when I looked at the measuring blocks, to do with load etc, it's no good taking the heating controller out to check the voltage of the compressor output, it works on pulse (I think) read it somewhere, so it's no good checking with a multimeter.

 

Measuring blocks is a good start.

 

Hope this helps,

 

 

Trev

39 minutes ago, Aston_Bodger said:

, it works on pulse (I think) read it somewhere, so it's no good checking with a multimeter.

 

 

You can just measure it on AC or use a clip on ammeter with the valve plugged in. You don't really need to get any meaningful numbers but you will obviously see some sort of difference between the climate asking for it to run or not

You can hot wire the valve and force it to work, applying 12v will run the compressor on maximum output. - That is assuming that the valve is functioning, its a simple quick and dirty way of testing the refrigeration system itself but not the controls, fans etc.

 

Removing the plug and fitting a 12v test bulb will show it its being commanded to operate but not the duty cycle.

 

I simply have several measuring blocks open and operate the heating controls, putting it on "LO" should show the voltage applied to the valve and you should see the evaporator temperature drop, bringing the temp up closer to the ambient/interior temp should see the voltage drop off and the evaporator temp rise.

 

Its something i am doing at the moment to decide if I need a further canister of R134a gas as I suspect, my question to the forum is:

 

What should be the lowest evaporator temperature for a system in good working order?

 

I think mine dropped to 1O°c, might have been 8°c, cant recall, will have to check again and would like to know the figure to do so.

Edited 23 August, 20196 yr by J.R.

2 hours ago, J.R. said:

What should be the lowest evaporator temperature for a system in good working order?

 

I think mine dropped to 1O°c, might have been 8°c, cant recall, will have to check again and would like to know the figure to do so.

 

There is no benchmark for what it should be, it depends on the cooling capacity of the system and the temperature and quantity of air going through the evaporator so too many variables really. I would think 8-10 would be good for a hot day, but in the cooler months you will get to a point where the compressor will throttle back to prevent ice forming so you may see as low as 5C

 

Did you fill your entire system with a can?

Edited 23 August, 20196 yr by SuperbTWM

The sellers of the cans quote the weight of the whole can and not the contents which I didnt realise, I thought that three 250g cans would be enough for a 525g charge, I intended weighing them as they were emptied and thought I would have most of the 3rd one as spare.

 

On weighing the first one after after filling the vacuumed down system I saw it had taken I think from memory (I suffer from  memory loss) it was 168g lighter so I used all 3 cans, some will have been lost in purging the lines for each new one so I think that i am a little light of the required 525 gramme fill up.

 

It started cooling after the first can, pressures got better with the second and third but my high side pressure does not go as high as I would like and the low side does not drop enough. The temperature was I think 24°c but again I cannot trust my memory, likewise for the evaporator temperature. I will write them all down next time.

 

I am only using figures taken from graphs and manuals corrected for temperatures and they might not be correct for this compressor and system.

Interestingly when I removed the lines from the manifold after removing the couplings oil was ejected with the gases, I have never seen this before but I have never filled a system before.

 

In the past it was for diagnostics so the lines would have contained mainly compressed air and a small amount of gas, if the refill cans contain oil as well then I guess what happened was normal, it just surprised me.

 

Come to think of it when I have vented a charged system with the manifold set to change the compressor only gas and no fluid came out. and yes I know its a very naughty ungreen thing to do.

Edited 23 August, 20196 yr by J.R.

 

23 hours ago, J.R. said:

On weighing the first one after after filling the vacuumed down system I saw it had taken I think from memory (I suffer from  memory loss) it was 168g lighter so I used all 3 cans, some will have been lost in purging the lines for each new one so I think that i am a little light of the required 525 gramme fill up.

 

 

Have you considered that You won't get 168g out of each consecutive can after the first. As the pressure of the system rises then you will get less and less out of each can as they equalise with the system pressure. You may be lighter on gas than you think.

 

Once you have enough to run the system you can minimise the effect by filling from the low pressure side I suppose.

Good point, no that had not occured to me but I understand the principle, I should have weighed every can after each fill.

 

I am still learning, taking on board what you say its going to need some from the next can when they all arrive (I stocked upbefore they stop selling it) but how much I can only judge roughly from the pressures.

 

I was filling it from the low side I think, will have to check.

Hot weather update:

14 bar seen on the hidden menu 10-1, but also mid-7s within a few minutes. I'm hoping that this implies that the compressor might be ok, and the fault is with either a sensor sending the wrong info about temp or pressure to the controller, or a sticking/faulty pressure regulating valve. If the main shaft is loose, would that cause this irregularity?

I've seen a suggestion to clear debris from the front of the condenser, so as that's a free fix I'm going to check for this evening.

As it's cheap, I'll also change the pollen filter this week to make sure that's not a contributing factor, but I really don't want to get into a game of component bingo so I'll try and get on a vcds system. Can a clever person please tell me what I should be looking for within the HVAC block in terms of correct readings and what would signify a fault? I'm assuming that I'd be looking at input and output temps, pressures, electrical requirements, and command signals...

I've also a concern over the functionalty (or lack of) of the condenser fan. Is there an easy way to test its non-full-speed operation? (It does work occasionally, but seemingly only at full-whack).

 

Thanks.

 

On 22/08/2019 at 22:22, Aston_Bodger said:

Hi tintinandcharlie,

 

That don't help, sorry, it's the measuring blocks you need, I will have to check what numbers you want, I know one is compressor shut off code, should be 0.0 and AC should be working, next one is compressor load, if that is low then the compressor is not working even though the shut off code says it is with 0.0, mine was like this, and it was the compressor that was goosed.

 

Like I said if you fancy a trip to Milton Keynes, I can do it for you and run some other tests too?

 

Hope this helps,

 

Trev

PM'd you...

 

I'll give the above suggestions a go this evening too...

 

T