Keep in mind that any pressure reduction will not prevent any already over stressed system and I am speaking of the hoses and ram & roof latch seals. The over pressure on the system will cause the hose to be dislodged from the connector and the seals will be forced out of the device seat. Without a doubt the over pressure and the under size of the equipment is a problem in this application!

 

This is a great question, but I think it's at present unanswerable.

If I had to guess, I'd bet that most cars running with pressure reduction will have their hoses survive to the life of the car, but some will not.

Running a little quick-and-dirty statistics: far as I know there have been no reported failures with a relief valve, and this is the first with voltage reduction. There are probably now several hundred car-years of service running these systems, so let's be conservative and say one failure every hundred car years. Example: for every ten cars, ten years of service, something like one failure expected.

This is of course a complete SWAG. If asked to prove it, I would run for the hills.

 

Yeah, probably have to run a poll in five or six years to get data. Hope I still own the car then.

Other related factors may come into play. Like - my car is black. Gets hotter than a white car. May shorten then time between episodes.

Also, my car had "green shower" summer of 2010 (previous owner). So my hoses were sort of new when I installed the pressure bypass a couple of months ago. May extend the time between episodes.

Jack

 

The issue really seems to be the jacket deteriorating in the heat. The pressure may or may not actually be an issue.

 

I think they are both major issues, especially since the pressure can also dislodge seals. The heat deterioration issue though has been understated, IMHO, in the online discussions.

 

Agreed. The almost-perfect track record (so far) of cars running with some form of pressure reduction has be more than coincidence.

Heat used to be talked about more, then that sort of got lost. Some guys have experimented with insulation on the theory that sunlight is a contributor. Don't know of any results. My own '01 lived in New England until I got it ('06), is parked mostly out of the sun, and the hoses, last I looked, have no visible sign of trouble.

 

How do I raise my roof manuall on a 2000 xk after the green shower?

 

Take a look here https://www.jaguarforums.com/forum/x...eration-72222/ Jim has included a pdf giving the info you need.

You probably won't be able to open the attachment as you haven't followed the new member procedure. C'est la vie.