Jaguar Forum banner
21 - 40 of 62 Posts

·
Registered
MY 2012 XF S Portfolio Ultimate Black
Joined
·
1,903 Posts
I don’t have s/s on my Jag but in my other car, s/s won’t kick in if the difference between cabin temperature and set point is large.
re valve current, I couldn’t replicate a situation where current was adjusted. It was always zero or max. Workshop manual says however that car uses PWM to change flow-rate. This has conflict with use of thermostatic expansion valve that effectively does the same thing but mechanically.
What is obvious is that you won’t hear AC clutch kick in and out when switching AC on/off. Clutch only disengages when pressure is too low or too high.
For the leakage, check a foam immediately after where ac pipes leaving condenser. Most cars develop a leakage there due to trapped road salt.
 

·
Registered
Joined
·
20,829 Posts
I don’t have s/s on my Jag but in my other car, s/s won’t kick in if the difference between cabin temperature and set point is large.
. . . . . . . .
Despite what I said in my earlier post, in retrospect I think this is the case in mine also. Been out today with the external temp at 24C and no S/S. Just haven't noticed it before.
When the S/S does cut in when the A/C is running, I get that distinctive wet-evaporator smell for a few seconds.
 

·
Registered
Joined
·
4,493 Posts
I'd love to see a real world study of SS and if it's actually made any difference in overall emissions release. I dare say I'll never see it though.
 

·
Registered
Joined
·
8,241 Posts
I'd love to see a real world study of SS and if it's actually made any difference in overall emissions release. I dare say I'll never see it though.
SS is intended to make a difference in situations where the vehicles engine 'could' be stopped from running and therefore producing unnecessary pollutants for the majority of it's journey or part thereof, i.e. journey's in 'grid locked' cities/towns/hamlets where pollution is a health risk, including three places that suffer dangerous levels of pollutants from vehicle emissions I can instantly think of in 'rural' Cornwall ..

"Overall emissions release" is not necessarily the mission objective.



#ignoredagain
 

·
Registered
MY 2012 XF S Portfolio Ultimate Black
Joined
·
1,903 Posts
My Toyota shows some of all times engine was switched off by SS. This can be displayed on the clock that is counted from when car was brand new. Figure is 50hrs which is over 50k miles and over 5years. My estimation is that the 1.3petrol engine it has, uses around 0.5L per hour. That is 25L over 5 years!
I guess this figure will be more for someone driving inside London for instance. Let’s say 4times more! 100lit over 5years?!
 

·
Registered
Joined
·
4,493 Posts
My Toyota shows some of all times engine was switched off by SS. This can be displayed on the clock that is counted from when car was brand new. Figure is 50hrs which is over 50k miles and over 5years. My estimation is that the 1.3petrol engine it has, uses around 0.5L per hour. That is 25L over 5 years!
I guess this figure will be more for someone driving inside London for instance. Let’s say 4times more! 100lit over 5years?!
I'd argue that it wouldn't be so high based on the car requiring to run certain things and retain enough charge to restart itself. In fact is go as far as saying that what it's showing, is pretty much the limit of what can be achieved. It certainly won't be a linear affair.

It's almost certainly a system designed and installed to make the most of, and manipulate the figures given for emissions release to the authorities and sales etc. In the real world, it's a complete waste of time which would probably be reset by the need to replace the battery slightly more often.
 

·
Registered
MY 2012 XF S Portfolio Ultimate Black
Joined
·
1,903 Posts
I'd argue that it wouldn't be so high based on the car requiring to run certain things and retain enough charge to restart itself. In fact is go as far as saying that what it's showing, is pretty much the limit of what can be achieved. It certainly won't be a linear affair.

It's almost certainly a system designed and installed to make the most of, and manipulate the figures given for emissions release to the authorities and sales etc. In the real world, it's a complete waste of time which would probably be reset by the need to replace the battery slightly more often.
I meant the same thing. I have saved 25lit over 5 years. I could have save more co2 by not driving the car for few days. Now compare the cost of 25lit fuel to a new battery that probably dies earlier or an uprated starter motor. Let alone the amount of stress these SS put on other parts. It’s certainly a way to go around legal requirements. Or maybe it’s just to reduce noise levels in cities!
 

·
Registered
Joined
·
242 Posts
Discussion Starter · #28 ·
Took the car in yesterday. A/C recharged. 284g of refrigerant in system. Held a vacuum for 15 minutes. 750g of refrigerant put in along with oil and uv. Now nice and cold AND when stopping stop start functioning.
 

·
Registered
MY 2012 XF S Portfolio Ultimate Black
Joined
·
1,903 Posts
Have a uv light in hand and check it regularly. You only have a chance to find that leakage (if any) while system is under pressure and refrigerant is leaking. They will be washed out quickly if you leave it for long.
 

·
Registered
Joined
·
4,493 Posts
Have a uv light in hand and check it regularly. You only have a chance to find that leakage (if any) while system is under pressure and refrigerant is leaking. They will be washed out quickly if you leave it for long.
That's assuming they've put the dye in, I don't believe it's a standard thing to put the dye in unless there has been a previous known issue.
 

·
Registered
🏴󠁧󠁢󠁳󠁣󠁴󠁿X260 R-Sport in Aurora Red
Joined
·
11,592 Posts
That's assuming they've put the dye in, I don't believe it's a standard thing to put the dye in unless there has been a previous known issue.
Paul mentions it included uv dye
 
  • Like
Reactions: PeteA

·
Registered
MY 2012 XF S Portfolio Ultimate Black
Joined
·
1,903 Posts
That's assuming they've put the dye in, I don't believe it's a standard thing to put the dye in unless there has been a previous known issue.
100% sure it comes with dye from factory.
It’s mentioned in WM. unless it’s flushed, dye would remain there.
 

·
Registered
Joined
·
20,829 Posts
I think there's something in the refrigerant that fluoresces under UV light anyway. A bit like semen . . . :oops:
 

·
Registered
Joined
·
930 Posts
Took the car in yesterday. A/C recharged. 284g of refrigerant in system. Held a vacuum for 15 minutes. 750g of refrigerant put in along with oil and uv. Now nice and cold AND when stopping stop start functioning.
Glad you have it working again Paul. But as Hamed say's keep an eye on the front A/C pipes. If you can safely get under the car and remove the large plastic tray under the car at the front (loads of screws) you can see in the tray if the pipes are leaking it stands out like a sore thumb, in the tray rigidity sections. If you do find it still leaks figure out which one it is . The HP pipe is a simple fix it fits at the bottom of the condenser, is easy to remove and replace. If it is the LP pipe then you have a problem but it is do-able.
 

·
Registered
Joined
·
242 Posts
Discussion Starter · #35 ·
Thanks for all the help. Where I took it they state that they do a pressure test using nitrogen and if OK then the vacuum and recharge. Believe they only did the vacuum, which it passed, and the recharge.

Will admit a little relieved that it has been recharged. Of to SW France next Monday and a question of 'would they be able to do the repairs by then if they found a leak' and if not the system would be completely empty.....and temps there can be 40+.

As for looking for any UV staining have just ordered a UV torch.
 

·
Registered
Joined
·
930 Posts
Hopefully you will be fine. These cars without A/C are awful, it spoils the whole experience. The problem with just a vac is that the refrigerant is very searching and at 250 psi it gets where other things can't. My son lives in le sables d'olonne and he say's the temp is over 30 degrees almost every day through the summer.
 

·
Registered
Joined
·
4,493 Posts
I think there's something in the refrigerant that fluoresces under UV light anyway. A bit like semen . . . :oops:
They usually have a high vis lifejacket on don't they?
 

·
Registered
MY 2012 XF S Portfolio Ultimate Black
Joined
·
1,903 Posts
Thanks for all the help. Where I took it they state that they do a pressure test using nitrogen and if OK then the vacuum and recharge. Believe they only did the vacuum, which it passed, and the recharge.

Will admit a little relieved that it has been recharged. Of to SW France next Monday and a question of 'would they be able to do the repairs by then if they found a leak' and if not the system would be completely empty.....and temps there can be 40+.

As for looking for any UV staining have just ordered a UV torch.
If you go to an ac repair shop, they should be able to reclaim the gas, do the repair and regas. If they did a nitrogen test (this is something automatically done if they have state of are machine) then you should be fine. Vacuum test is not enough however.
 

·
Registered
Joined
·
242 Posts
Discussion Starter · #39 ·
Yes, will get it fully sorted when I get back, in the meantime will have a look with the UV torch when it arrives.
 

·
Registered
Joined
·
51 Posts
Had my XFS air con repaired under extended warranty. An area where leakage can occur is the a/c pipes run through a sponge grommet in the n/s front bumper area. Causes the pipes to corrode. Think there was a service bulletin for the issue.
 
21 - 40 of 62 Posts
Top