[xj] Heater / AC Fixed?

First I’d like to thank those who contributed to my understanding
of this problem. Between John Hudson’s excellent picture of the
vacuum lines (allowing me to isolated directly to the source
visually) and Gregory Andrachuk’s exceedingly helpful vacuum line
diagram, coupled with the help of several other seasoned veterans,
the seemingly impossible task of locating the loose line on the
servo switch has been accomplished.

At first, I thought I had done more damage than good, based on my
initial observation. Evidently, the climate control wouldn’t allow
me to initiate any settings except the defroster. It was almost as
if the entire system lacked vacuum (which evidently allows the
servos to actuate the defroster vents, but nothing else. Also odd,
was the fact that even the compressor only turned on while in the
defrost setting…very depressing.

Then, after what seemed like nearly 2-5 minutes of run time, I had
turned the system off and on a couple of times, the system suddenly
came to life on the ‘‘low’’ setting. It was as if all of the servos
had ‘‘awakened’’. All of a sudden, the center vent linkage was put
into action, the heater valve switch actuated, the compressor
kicked in, and frosty cold air poured out of the center and fascia
vents (in addition to the floor and rear vents). The AC was now
working perfectly, through ALL of the prescribed vents. I moved
the control to ‘‘high’’ and a blizzard of cold air shot through all
of the vents. I’ve yet to take her out on the road pursuant to
this ‘‘procedure’’ (I pretty much removed every interior dash/console
panel imaginable in my search and still need to reassemble),
however, I’m now hopeful.

I’ll let everyone know how things come out on her first road test,
which may be in a day or two, but this has been a REAL breakthrough.

Now for the obvious question…why did the system take a few
minutes to ‘‘come to life’’? Was it due to the absence of system
vacuum (normally maintained in a reservoir) and the need to
reestablish it? This is the only ‘‘logical’’ conclusion I can draw.
Unless, in my attempts to re-run the vacuum line I bumped something
(tons of connections near the bottom of the servo switch with which
I could’ve made intermittent contact). Any thoughts?

Again thanks.

Regards,

Barry–
BarryK
Cherry Hill, NJ, United States
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Barry: BRAVO!!
Perseverance pays off. Now, you have discovered the Jaguar secret…they
fix themselves if you allow them to do so (this sounds odd, but I have found
it to be true very often). Your system has probably been inoperative for so
long that the controls were likely dirty, oxydised, the servos lazy, etc. in
addition to the lack of vacuum which you have now remedied. If you allow
the system to be used regularly for a while on automatic, it will cycle
itself through its entire range; this will clear out any remaining bugs. The
Jaguar likes exercise, every part of it. Well done.

                                    Gregory----- Original Message -----

From: “BarryK” bkindig3@comcast.net
To: xj@jag-lovers.org
Sent: Wednesday, June 18, 2003 5:44 PM
Subject: [xj] Heater / AC Fixed??

: First I’d like to thank those who contributed to my understanding
: of this problem. Between John Hudson’s excellent picture of the
: vacuum lines (allowing me to isolated directly to the source
: visually) and Gregory Andrachuk’s exceedingly helpful vacuum line
: diagram, coupled with the help of several other seasoned veterans,
: the seemingly impossible task of locating the loose line on the
: servo switch has been accomplished.
:
: At first, I thought I had done more damage than good, based on my
: initial observation. Evidently, the climate control wouldn’t allow
: me to initiate any settings except the defroster. It was almost as
: if the entire system lacked vacuum (which evidently allows the
: servos to actuate the defroster vents, but nothing else. Also odd,
: was the fact that even the compressor only turned on while in the
: defrost setting…very depressing.
:
: Then, after what seemed like nearly 2-5 minutes of run time, I had
: turned the system off and on a couple of times, the system suddenly
: came to life on the ‘‘low’’ setting. It was as if all of the servos
: had ‘‘awakened’’. All of a sudden, the center vent linkage was put
: into action, the heater valve switch actuated, the compressor
: kicked in, and frosty cold air poured out of the center and fascia
: vents (in addition to the floor and rear vents). The AC was now
: working perfectly, through ALL of the prescribed vents. I moved
: the control to ‘‘high’’ and a blizzard of cold air shot through all
: of the vents. I’ve yet to take her out on the road pursuant to
: this ‘‘procedure’’ (I pretty much removed every interior dash/console
: panel imaginable in my search and still need to reassemble),
: however, I’m now hopeful.
:
: I’ll let everyone know how things come out on her first road test,
: which may be in a day or two, but this has been a REAL breakthrough.
:
: Now for the obvious question…why did the system take a few
: minutes to ‘‘come to life’’? Was it due to the absence of system
: vacuum (normally maintained in a reservoir) and the need to
: reestablish it? This is the only ‘‘logical’’ conclusion I can draw.
: Unless, in my attempts to re-run the vacuum line I bumped something
: (tons of connections near the bottom of the servo switch with which
: I could’ve made intermittent contact). Any thoughts?
:
: Again thanks.
:
: Regards,
:
: Barry
: –
: BarryK
: Cherry Hill, NJ, United States
: --Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
:
: ===================================================
: The archives and FAQ will answer many queries on the XJ series…
: FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
: Archives: http://www.jag-lovers.org/lists/search.html
:
: To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.
:
: // please trim quoted text to context only
:
:

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

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BarryK wrote:

Now for the obvious question…why did the system take a few
minutes to ‘‘come to life’’? Was it due to the absence of system
vacuum (normally maintained in a reservoir) and the need to
reestablish it? This is the only ‘‘logical’’ conclusion I can draw.
Unless, in my attempts to re-run the vacuum line I bumped something
(tons of connections near the bottom of the servo switch with which
I could’ve made intermittent contact). Any thoughts?

As s… sometimes happens, so does the silverlined clouds, Barry…:slight_smile:

Quite likely you have touched a raw nerve somewhere, as you imply. There
certainly are plenty of possibilities, and anybody’s guess where. In
principle lack of vacume won’t interfere with electrics, and the servo
will traverse. But an electric fault may influence all or some of the
vacume operations.

The complex interactions of the system is not amenable to subjective
evaluations of system operation. That’s why the testing procedure is
somewhat intricate. Typical example is that in some conditions the
blowers will not start until the coolant has reach triggering the
temperature of the A/C temp transmitter…:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)===================================================
The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from BarryK sent Thu 19 Jun 2003:

Congratulations on your breakthrough Barry! A possible answer for
your question why it took a while for the blowers to kick in, is
the warming up time for the coolant (as Frank mentioned). On my
1986 XJ6 Sovereign the blowers will only blow in the following
situations:
a. immediately after turning the key to the first position, when
it’s warm in the car and the airco is needed. After starting the
car the compressor kicks in and cool air coms through all the vents.
b. after the coolant reaches about 55 degrees Celsius, when the
interior needs to be heated. I think this is a good feature of the
system, because you won’t be getting any freezing air into the car
when it’s freezing outside.

I’m very content with the climate control system in my Jag, except
for the noise of the compressor when it is running. I’m afraid the
bearings are bad or broke, so I have to replace the compressor in
the near future. When the compressor kicks in it has a noticeable
effect on the power of the car, so I push the pedal a little harder.

Good luck in your now 'climate controlled car!

Rick van Willigen
1986 XJ6 4.2 Sovereign
Netherlands–
The original message included these comments:

Now for the obvious question…why did the system take a few
minutes to ‘‘come to life’’? Was it due to the absence of system
vacuum (normally maintained in a reservoir) and the need to
reestablish it? This is the only ‘‘logical’’ conclusion I can draw.
Unless, in my attempts to re-run the vacuum line I bumped something
(tons of connections near the bottom of the servo switch with which
I could’ve made intermittent contact). Any thoughts?


Rick van Willigen
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

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