XJ A/C pump
10-22-2003, 10:51 AM
#1
Guest
Posts: n/a
XJ A/C pump
My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
30 seconds the A/C pump engages for about a second and then disengages. I
assume this is not normal (my YJ did not have A/C). Am I looking at just
replacing the clutch assembly (is that possible?) on the pump or the entire
pump itself? Any other advice on this?
Thanks a lot,
Jason
30 seconds the A/C pump engages for about a second and then disengages. I
assume this is not normal (my YJ did not have A/C). Am I looking at just
replacing the clutch assembly (is that possible?) on the pump or the entire
pump itself? Any other advice on this?
Thanks a lot,
Jason
10-22-2003, 11:52 AM
#2
Guest
Posts: n/a
Re: XJ A/C pump
On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
<lavoiej@eatspam.lycos.com> wrote:
>My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
>30 seconds the A/C pump engages for about a second and then disengages. I
>assume this is not normal (my YJ did not have A/C). Am I looking at just
>replacing the clutch assembly (is that possible?) on the pump or the entire
>pump itself? Any other advice on this?
>
>Thanks a lot,
>
>Jason
>
That's a pretty wierd symptom, but I doubt if replacing the clutch or
compressor would fix it. Sounds like a problem in the control
circuitry.
I would start by disconnecting the wires at the clutch and hooking up
a voltmeter to see what is happening - maybe you are getting stray
voltage high enough to momentarily lock the clutch. Also check the
ground while you are at it.
These are guesses, but you have to start somewhere....
ps: get a wiring diagram and a decent digital volt/ ohm meter.
John Davies
Spokane WA USA
<lavoiej@eatspam.lycos.com> wrote:
>My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
>30 seconds the A/C pump engages for about a second and then disengages. I
>assume this is not normal (my YJ did not have A/C). Am I looking at just
>replacing the clutch assembly (is that possible?) on the pump or the entire
>pump itself? Any other advice on this?
>
>Thanks a lot,
>
>Jason
>
That's a pretty wierd symptom, but I doubt if replacing the clutch or
compressor would fix it. Sounds like a problem in the control
circuitry.
I would start by disconnecting the wires at the clutch and hooking up
a voltmeter to see what is happening - maybe you are getting stray
voltage high enough to momentarily lock the clutch. Also check the
ground while you are at it.
These are guesses, but you have to start somewhere....
ps: get a wiring diagram and a decent digital volt/ ohm meter.
John Davies
Spokane WA USA
10-22-2003, 11:52 AM
#3
Guest
Posts: n/a
Re: XJ A/C pump
On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
<lavoiej@eatspam.lycos.com> wrote:
>My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
>30 seconds the A/C pump engages for about a second and then disengages. I
>assume this is not normal (my YJ did not have A/C). Am I looking at just
>replacing the clutch assembly (is that possible?) on the pump or the entire
>pump itself? Any other advice on this?
>
>Thanks a lot,
>
>Jason
>
That's a pretty wierd symptom, but I doubt if replacing the clutch or
compressor would fix it. Sounds like a problem in the control
circuitry.
I would start by disconnecting the wires at the clutch and hooking up
a voltmeter to see what is happening - maybe you are getting stray
voltage high enough to momentarily lock the clutch. Also check the
ground while you are at it.
These are guesses, but you have to start somewhere....
ps: get a wiring diagram and a decent digital volt/ ohm meter.
John Davies
Spokane WA USA
<lavoiej@eatspam.lycos.com> wrote:
>My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
>30 seconds the A/C pump engages for about a second and then disengages. I
>assume this is not normal (my YJ did not have A/C). Am I looking at just
>replacing the clutch assembly (is that possible?) on the pump or the entire
>pump itself? Any other advice on this?
>
>Thanks a lot,
>
>Jason
>
That's a pretty wierd symptom, but I doubt if replacing the clutch or
compressor would fix it. Sounds like a problem in the control
circuitry.
I would start by disconnecting the wires at the clutch and hooking up
a voltmeter to see what is happening - maybe you are getting stray
voltage high enough to momentarily lock the clutch. Also check the
ground while you are at it.
These are guesses, but you have to start somewhere....
ps: get a wiring diagram and a decent digital volt/ ohm meter.
John Davies
Spokane WA USA
10-22-2003, 11:52 AM
#4
Guest
Posts: n/a
Re: XJ A/C pump
On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
<lavoiej@eatspam.lycos.com> wrote:
>My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
>30 seconds the A/C pump engages for about a second and then disengages. I
>assume this is not normal (my YJ did not have A/C). Am I looking at just
>replacing the clutch assembly (is that possible?) on the pump or the entire
>pump itself? Any other advice on this?
>
>Thanks a lot,
>
>Jason
>
That's a pretty wierd symptom, but I doubt if replacing the clutch or
compressor would fix it. Sounds like a problem in the control
circuitry.
I would start by disconnecting the wires at the clutch and hooking up
a voltmeter to see what is happening - maybe you are getting stray
voltage high enough to momentarily lock the clutch. Also check the
ground while you are at it.
These are guesses, but you have to start somewhere....
ps: get a wiring diagram and a decent digital volt/ ohm meter.
John Davies
Spokane WA USA
<lavoiej@eatspam.lycos.com> wrote:
>My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
>30 seconds the A/C pump engages for about a second and then disengages. I
>assume this is not normal (my YJ did not have A/C). Am I looking at just
>replacing the clutch assembly (is that possible?) on the pump or the entire
>pump itself? Any other advice on this?
>
>Thanks a lot,
>
>Jason
>
That's a pretty wierd symptom, but I doubt if replacing the clutch or
compressor would fix it. Sounds like a problem in the control
circuitry.
I would start by disconnecting the wires at the clutch and hooking up
a voltmeter to see what is happening - maybe you are getting stray
voltage high enough to momentarily lock the clutch. Also check the
ground while you are at it.
These are guesses, but you have to start somewhere....
ps: get a wiring diagram and a decent digital volt/ ohm meter.
John Davies
Spokane WA USA
10-22-2003, 11:53 AM
#5
Guest
Posts: n/a
Re: XJ A/C pump
CrazyJ <lavoiej@eatspam.lycos.com> wrote:
> My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
> 30 seconds the A/C pump engages for about a second and then disengages. I
> assume this is not normal (my YJ did not have A/C). Am I looking at just
> replacing the clutch assembly (is that possible?) on the pump or the entire
> pump itself? Any other advice on this?
Just a simple thought: you say that the A/C is off, but could it be set to
defrost (front window upper dash outlets)? The A/C compressor will also run
(along with the electric radiator cooling fan) when the HVAC control is set to
front window defrost. The purpose is to dehumidify the air and hopefully
defog the front window faster.
Other than that, since the clutch is electrically operated, I'd whip out a
tester and see if it is being energized when you hear it engaging. If so,
then you probably don't have a mechanical failure. Something is "telling" it
to energize.
Just a guess...
-John
> My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
> 30 seconds the A/C pump engages for about a second and then disengages. I
> assume this is not normal (my YJ did not have A/C). Am I looking at just
> replacing the clutch assembly (is that possible?) on the pump or the entire
> pump itself? Any other advice on this?
Just a simple thought: you say that the A/C is off, but could it be set to
defrost (front window upper dash outlets)? The A/C compressor will also run
(along with the electric radiator cooling fan) when the HVAC control is set to
front window defrost. The purpose is to dehumidify the air and hopefully
defog the front window faster.
Other than that, since the clutch is electrically operated, I'd whip out a
tester and see if it is being energized when you hear it engaging. If so,
then you probably don't have a mechanical failure. Something is "telling" it
to energize.
Just a guess...
-John
10-22-2003, 11:53 AM
#6
Guest
Posts: n/a
Re: XJ A/C pump
CrazyJ <lavoiej@eatspam.lycos.com> wrote:
> My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
> 30 seconds the A/C pump engages for about a second and then disengages. I
> assume this is not normal (my YJ did not have A/C). Am I looking at just
> replacing the clutch assembly (is that possible?) on the pump or the entire
> pump itself? Any other advice on this?
Just a simple thought: you say that the A/C is off, but could it be set to
defrost (front window upper dash outlets)? The A/C compressor will also run
(along with the electric radiator cooling fan) when the HVAC control is set to
front window defrost. The purpose is to dehumidify the air and hopefully
defog the front window faster.
Other than that, since the clutch is electrically operated, I'd whip out a
tester and see if it is being energized when you hear it engaging. If so,
then you probably don't have a mechanical failure. Something is "telling" it
to energize.
Just a guess...
-John
> My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
> 30 seconds the A/C pump engages for about a second and then disengages. I
> assume this is not normal (my YJ did not have A/C). Am I looking at just
> replacing the clutch assembly (is that possible?) on the pump or the entire
> pump itself? Any other advice on this?
Just a simple thought: you say that the A/C is off, but could it be set to
defrost (front window upper dash outlets)? The A/C compressor will also run
(along with the electric radiator cooling fan) when the HVAC control is set to
front window defrost. The purpose is to dehumidify the air and hopefully
defog the front window faster.
Other than that, since the clutch is electrically operated, I'd whip out a
tester and see if it is being energized when you hear it engaging. If so,
then you probably don't have a mechanical failure. Something is "telling" it
to energize.
Just a guess...
-John
10-22-2003, 11:53 AM
#7
Guest
Posts: n/a
Re: XJ A/C pump
CrazyJ <lavoiej@eatspam.lycos.com> wrote:
> My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
> 30 seconds the A/C pump engages for about a second and then disengages. I
> assume this is not normal (my YJ did not have A/C). Am I looking at just
> replacing the clutch assembly (is that possible?) on the pump or the entire
> pump itself? Any other advice on this?
Just a simple thought: you say that the A/C is off, but could it be set to
defrost (front window upper dash outlets)? The A/C compressor will also run
(along with the electric radiator cooling fan) when the HVAC control is set to
front window defrost. The purpose is to dehumidify the air and hopefully
defog the front window faster.
Other than that, since the clutch is electrically operated, I'd whip out a
tester and see if it is being energized when you hear it engaging. If so,
then you probably don't have a mechanical failure. Something is "telling" it
to energize.
Just a guess...
-John
> My wife's 'new' 2000 XJ is doing something weird. With the A/C off, every
> 30 seconds the A/C pump engages for about a second and then disengages. I
> assume this is not normal (my YJ did not have A/C). Am I looking at just
> replacing the clutch assembly (is that possible?) on the pump or the entire
> pump itself? Any other advice on this?
Just a simple thought: you say that the A/C is off, but could it be set to
defrost (front window upper dash outlets)? The A/C compressor will also run
(along with the electric radiator cooling fan) when the HVAC control is set to
front window defrost. The purpose is to dehumidify the air and hopefully
defog the front window faster.
Other than that, since the clutch is electrically operated, I'd whip out a
tester and see if it is being energized when you hear it engaging. If so,
then you probably don't have a mechanical failure. Something is "telling" it
to energize.
Just a guess...
-John
10-22-2003, 01:38 PM
#8
Guest
Posts: n/a
Re: XJ A/C pump
Overpressure? If the system overpressures, I believe the clutch
automatically disengages until the overpressure clears. It could be due to
a blocked line or orifice.
--
Jim
--
98 TJ SE
90 SJ GW
http://www.delawareja.com/gallery/JDJeep98
"John Davies" <johnedavies@comcast.net> wrote in message
news:0o9dpv4us3k201a9ao06gaerca5nfqsdu8@4ax.com...
> On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
> <lavoiej@eatspam.lycos.com> wrote:
>
> >My wife's 'new' 2000 XJ is doing something weird. With the A/C off,
every
> >30 seconds the A/C pump engages for about a second and then disengages.
I
> >assume this is not normal (my YJ did not have A/C). Am I looking at just
> >replacing the clutch assembly (is that possible?) on the pump or the
entire
> >pump itself? Any other advice on this?
> >
> >Thanks a lot,
> >
> >Jason
> >
> That's a pretty wierd symptom, but I doubt if replacing the clutch or
> compressor would fix it. Sounds like a problem in the control
> circuitry.
>
> I would start by disconnecting the wires at the clutch and hooking up
> a voltmeter to see what is happening - maybe you are getting stray
> voltage high enough to momentarily lock the clutch. Also check the
> ground while you are at it.
>
> These are guesses, but you have to start somewhere....
>
> ps: get a wiring diagram and a decent digital volt/ ohm meter.
>
> John Davies
> Spokane WA USA
automatically disengages until the overpressure clears. It could be due to
a blocked line or orifice.
--
Jim
--
98 TJ SE
90 SJ GW
http://www.delawareja.com/gallery/JDJeep98
"John Davies" <johnedavies@comcast.net> wrote in message
news:0o9dpv4us3k201a9ao06gaerca5nfqsdu8@4ax.com...
> On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
> <lavoiej@eatspam.lycos.com> wrote:
>
> >My wife's 'new' 2000 XJ is doing something weird. With the A/C off,
every
> >30 seconds the A/C pump engages for about a second and then disengages.
I
> >assume this is not normal (my YJ did not have A/C). Am I looking at just
> >replacing the clutch assembly (is that possible?) on the pump or the
entire
> >pump itself? Any other advice on this?
> >
> >Thanks a lot,
> >
> >Jason
> >
> That's a pretty wierd symptom, but I doubt if replacing the clutch or
> compressor would fix it. Sounds like a problem in the control
> circuitry.
>
> I would start by disconnecting the wires at the clutch and hooking up
> a voltmeter to see what is happening - maybe you are getting stray
> voltage high enough to momentarily lock the clutch. Also check the
> ground while you are at it.
>
> These are guesses, but you have to start somewhere....
>
> ps: get a wiring diagram and a decent digital volt/ ohm meter.
>
> John Davies
> Spokane WA USA
10-22-2003, 01:38 PM
#9
Guest
Posts: n/a
Re: XJ A/C pump
Overpressure? If the system overpressures, I believe the clutch
automatically disengages until the overpressure clears. It could be due to
a blocked line or orifice.
--
Jim
--
98 TJ SE
90 SJ GW
http://www.delawareja.com/gallery/JDJeep98
"John Davies" <johnedavies@comcast.net> wrote in message
news:0o9dpv4us3k201a9ao06gaerca5nfqsdu8@4ax.com...
> On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
> <lavoiej@eatspam.lycos.com> wrote:
>
> >My wife's 'new' 2000 XJ is doing something weird. With the A/C off,
every
> >30 seconds the A/C pump engages for about a second and then disengages.
I
> >assume this is not normal (my YJ did not have A/C). Am I looking at just
> >replacing the clutch assembly (is that possible?) on the pump or the
entire
> >pump itself? Any other advice on this?
> >
> >Thanks a lot,
> >
> >Jason
> >
> That's a pretty wierd symptom, but I doubt if replacing the clutch or
> compressor would fix it. Sounds like a problem in the control
> circuitry.
>
> I would start by disconnecting the wires at the clutch and hooking up
> a voltmeter to see what is happening - maybe you are getting stray
> voltage high enough to momentarily lock the clutch. Also check the
> ground while you are at it.
>
> These are guesses, but you have to start somewhere....
>
> ps: get a wiring diagram and a decent digital volt/ ohm meter.
>
> John Davies
> Spokane WA USA
automatically disengages until the overpressure clears. It could be due to
a blocked line or orifice.
--
Jim
--
98 TJ SE
90 SJ GW
http://www.delawareja.com/gallery/JDJeep98
"John Davies" <johnedavies@comcast.net> wrote in message
news:0o9dpv4us3k201a9ao06gaerca5nfqsdu8@4ax.com...
> On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
> <lavoiej@eatspam.lycos.com> wrote:
>
> >My wife's 'new' 2000 XJ is doing something weird. With the A/C off,
every
> >30 seconds the A/C pump engages for about a second and then disengages.
I
> >assume this is not normal (my YJ did not have A/C). Am I looking at just
> >replacing the clutch assembly (is that possible?) on the pump or the
entire
> >pump itself? Any other advice on this?
> >
> >Thanks a lot,
> >
> >Jason
> >
> That's a pretty wierd symptom, but I doubt if replacing the clutch or
> compressor would fix it. Sounds like a problem in the control
> circuitry.
>
> I would start by disconnecting the wires at the clutch and hooking up
> a voltmeter to see what is happening - maybe you are getting stray
> voltage high enough to momentarily lock the clutch. Also check the
> ground while you are at it.
>
> These are guesses, but you have to start somewhere....
>
> ps: get a wiring diagram and a decent digital volt/ ohm meter.
>
> John Davies
> Spokane WA USA
10-22-2003, 01:38 PM
#10
Guest
Posts: n/a
Re: XJ A/C pump
Overpressure? If the system overpressures, I believe the clutch
automatically disengages until the overpressure clears. It could be due to
a blocked line or orifice.
--
Jim
--
98 TJ SE
90 SJ GW
http://www.delawareja.com/gallery/JDJeep98
"John Davies" <johnedavies@comcast.net> wrote in message
news:0o9dpv4us3k201a9ao06gaerca5nfqsdu8@4ax.com...
> On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
> <lavoiej@eatspam.lycos.com> wrote:
>
> >My wife's 'new' 2000 XJ is doing something weird. With the A/C off,
every
> >30 seconds the A/C pump engages for about a second and then disengages.
I
> >assume this is not normal (my YJ did not have A/C). Am I looking at just
> >replacing the clutch assembly (is that possible?) on the pump or the
entire
> >pump itself? Any other advice on this?
> >
> >Thanks a lot,
> >
> >Jason
> >
> That's a pretty wierd symptom, but I doubt if replacing the clutch or
> compressor would fix it. Sounds like a problem in the control
> circuitry.
>
> I would start by disconnecting the wires at the clutch and hooking up
> a voltmeter to see what is happening - maybe you are getting stray
> voltage high enough to momentarily lock the clutch. Also check the
> ground while you are at it.
>
> These are guesses, but you have to start somewhere....
>
> ps: get a wiring diagram and a decent digital volt/ ohm meter.
>
> John Davies
> Spokane WA USA
automatically disengages until the overpressure clears. It could be due to
a blocked line or orifice.
--
Jim
--
98 TJ SE
90 SJ GW
http://www.delawareja.com/gallery/JDJeep98
"John Davies" <johnedavies@comcast.net> wrote in message
news:0o9dpv4us3k201a9ao06gaerca5nfqsdu8@4ax.com...
> On Wed, 22 Oct 2003 10:51:20 -0400, "CrazyJ"
> <lavoiej@eatspam.lycos.com> wrote:
>
> >My wife's 'new' 2000 XJ is doing something weird. With the A/C off,
every
> >30 seconds the A/C pump engages for about a second and then disengages.
I
> >assume this is not normal (my YJ did not have A/C). Am I looking at just
> >replacing the clutch assembly (is that possible?) on the pump or the
entire
> >pump itself? Any other advice on this?
> >
> >Thanks a lot,
> >
> >Jason
> >
> That's a pretty wierd symptom, but I doubt if replacing the clutch or
> compressor would fix it. Sounds like a problem in the control
> circuitry.
>
> I would start by disconnecting the wires at the clutch and hooking up
> a voltmeter to see what is happening - maybe you are getting stray
> voltage high enough to momentarily lock the clutch. Also check the
> ground while you are at it.
>
> These are guesses, but you have to start somewhere....
>
> ps: get a wiring diagram and a decent digital volt/ ohm meter.
>
> John Davies
> Spokane WA USA
