[xj] Summertime Blues revisited

In reply to a message from James Mc Arthur sent Sat 5 Jun 2010:

It’s fairly straight forward, my success rate is running at 66% at
the moment.

Deifinitely replace the O rings at either end of the receiver/drier
and new ones should be supplied with the compressor. Make sure
that whichever of the HSLP or superheat switch you have, you get
the same sort on the new compressor. They don’t appear to be
interchangeable.–
al mclean '93 XJS 4.0 - '84 4.2 Daimler - '84 DD6
Telford, United Kingdom
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In reply to a message from James Mc Arthur sent Sat 5 Jun 2010:

Hmmm…

By ‘‘dreaded screeching noise’’ do you mean the belt, or
perhaps the clutch (either friction plates or bearing)? I’m
not familiar with a screeching noise from within the A6, but
my experience is limited (which is not a bad thing in this
case).

Were you still charging when the noise appeared? Was the
blower output cold or getting cold? What were the pressures?

If something happened to the compressor, you should clean
the system out. If it was the belt or clutch, you could
chance just replacing the dryer, plus the compressor o-ring
seals, of course.

Check for leaks, which you evidently have.

Finally (and hopefully), is it possible that the belt wasn’t
tight enough? The load increases when it’s fully charged.–
The original message included these comments:

Good Day gents! Well I briefly spent some time this morning attempting to add 134A to the Jaguar. It was rather low and that is cause for concern because the system was recharged between one and two years ago. So, after about 15 minutes, the compressor started that dreaded screeching noise; we all know what that means! I have located a reman compressor at the local auto parts and they advise replacing at dryer; as a matter of fact, you void the warranty if you don’t. My question here is: assuming that one has a fair amount of mechanical know how and experience turning wrenches, is the replacement of the compressor and dryer a job that one may tackle with reasonable confidence? Should one replace as many seals as is humanly possible in the other areas of the system? Should anything else be replaced as long as the system is open? Any pointers and 'don’t do’s? Thanks to all in advance! Jim McArthur/ York, Pa. 1986 XJ6


Bob Wilkinson, 72 XJ6
Saint Louis, MO, United States
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However, its easy enough to swap the entire end plate that carries the
switch. Just make sure the seal is clean or it will leak.

Craig

almcl wrote:> Make sure

that whichever of the HSLP or superheat switch you have, you get
the same sort on the new compressor. They don’t appear to be
interchangeable.

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In reply to a message from James Mc Arthur sent Sat 5 Jun 2010:

are you sure the screeching noise is the compressor and not the Air
Pump above it?

are you sure it is not one of the belts screeching?

I would suggest ordering the factory Shop Manual CD, it will save
you a lot of headaches.

everytime you open the a/c system to atmosphere, you need to
replace the Dryer, that’s a common requirement in any car. And you
also need a vacuum pump to evacuate the system and test for leaks
before charging it.

Zurdo–
The original message included these comments:

Good Day gents! Well I briefly spent some time this morning attempting to add 134A to the Jaguar. It was rather low and that is cause for concern because the system was recharged between one and two years ago. So, after about 15 minutes, the compressor started that dreaded screeching noise; we all know what that means! I have located a reman compressor at the local auto parts and they advise replacing at dryer; as a matter of fact, you void the warranty if you don’t. My question here is: assuming that one has a fair amount of mechanical know how and experience turning wrenches, is the replacement of the compressor and dryer a job that one may tackle with reasonable confidence? Should one replace as many seals as is humanly possible in the other areas of the system? Should anything else be replaced as long as the system is open? Any pointers and 'don’t do’s? Thanks to all in advance! Jim McArthur/ York, Pa. 1986 XJ6


1965 3.8 ‘S’ 1984 XJ-6
Florida, United States
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The archives and FAQ will answer many queries on the XJ series…
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