AC Charge 134a on a 93 cherokee sport
 

Hi All,

I bought a 93 cherokee sport a half year ago and the guy told me the
ac does not work. I checked the repair records and saw a r134a
conversion and charge by a professional in 2004. I tried charging it
myself today. I located the low pressure port (bottom one on the back
of the compressor with blue cap). First the system wouldn't except any
gas, it just made the dial on the can of coolant shoot up and then the
connector would hiss off when I removed it. Hmmmm, noticed that the
compressor didn't turn on. Checked the forums and found out to jumper
the low pressure switch. I was pleased to note that the compressor
runs. However, when I connected the 134a coolant, expecting it to suck
it up the gas, it once again did not seem to want to accept gas. Is
there another valve that I need to open? Does anyone have any
suggestions for how to trouble shoot this? I figure that I would just
waste cans if I had a leak. That is why I think this behavior is kind
of odd. I'm probably missing something easy here.

Thanks for your help.

Best,
Breton

Re: AC Charge 134a on a 93 cherokee sport
 

On 7 May 2007 10:20:38 -0700, breton <bretonh@gmail.com> wrote:

>Hi All,
>
>I bought a 93 cherokee sport a half year ago and the guy told me the
>ac does not work. I checked the repair records and saw a r134a
>conversion and charge by a professional in 2004. I tried charging it
>myself today. I located the low pressure port (bottom one on the back
>of the compressor with blue cap). First the system wouldn't except any
>gas, it just made the dial on the can of coolant shoot up and then the
>connector would hiss off when I removed it. Hmmmm, noticed that the
>compressor didn't turn on. Checked the forums and found out to jumper
>the low pressure switch. I was pleased to note that the compressor
>runs. However, when I connected the 134a coolant, expecting it to suck
>it up the gas, it once again did not seem to want to accept gas. Is
>there another valve that I need to open? Does anyone have any
>suggestions for how to trouble shoot this? I figure that I would just
>waste cans if I had a leak. That is why I think this behavior is kind
>of odd. I'm probably missing something easy here.
>
>Thanks for your help.
>
>Best,
>Breton


If you want to do this yourself properly I suggest you borrow, rent or
buy a set of gauges for R134 systems ans see what pressures you
actually have when compressor is running.
-----------------
TheSnoMan.com

Re: AC Charge 134a on a 93 cherokee sport
 

On 7 May 2007 10:20:38 -0700, breton <bretonh@gmail.com> wrote:

>Hi All,
>
>I bought a 93 cherokee sport a half year ago and the guy told me the
>ac does not work. I checked the repair records and saw a r134a
>conversion and charge by a professional in 2004. I tried charging it
>myself today. I located the low pressure port (bottom one on the back
>of the compressor with blue cap). First the system wouldn't except any
>gas, it just made the dial on the can of coolant shoot up and then the
>connector would hiss off when I removed it. Hmmmm, noticed that the
>compressor didn't turn on. Checked the forums and found out to jumper
>the low pressure switch. I was pleased to note that the compressor
>runs. However, when I connected the 134a coolant, expecting it to suck
>it up the gas, it once again did not seem to want to accept gas. Is
>there another valve that I need to open? Does anyone have any
>suggestions for how to trouble shoot this? I figure that I would just
>waste cans if I had a leak. That is why I think this behavior is kind
>of odd. I'm probably missing something easy here.
>
>Thanks for your help.
>
>Best,
>Breton


If you want to do this yourself properly I suggest you borrow, rent or
buy a set of gauges for R134 systems ans see what pressures you
actually have when compressor is running.
-----------------
TheSnoMan.com

Re: AC Charge 134a on a 93 cherokee sport
 

On 7 May 2007 10:20:38 -0700, breton <bretonh@gmail.com> wrote:

>Hi All,
>
>I bought a 93 cherokee sport a half year ago and the guy told me the
>ac does not work. I checked the repair records and saw a r134a
>conversion and charge by a professional in 2004. I tried charging it
>myself today. I located the low pressure port (bottom one on the back
>of the compressor with blue cap). First the system wouldn't except any
>gas, it just made the dial on the can of coolant shoot up and then the
>connector would hiss off when I removed it. Hmmmm, noticed that the
>compressor didn't turn on. Checked the forums and found out to jumper
>the low pressure switch. I was pleased to note that the compressor
>runs. However, when I connected the 134a coolant, expecting it to suck
>it up the gas, it once again did not seem to want to accept gas. Is
>there another valve that I need to open? Does anyone have any
>suggestions for how to trouble shoot this? I figure that I would just
>waste cans if I had a leak. That is why I think this behavior is kind
>of odd. I'm probably missing something easy here.
>
>Thanks for your help.
>
>Best,
>Breton


If you want to do this yourself properly I suggest you borrow, rent or
buy a set of gauges for R134 systems ans see what pressures you
actually have when compressor is running.
-----------------
TheSnoMan.com

Re: AC Charge 134a on a 93 cherokee sport
 

On 7 May 2007 10:20:38 -0700, breton <bretonh@gmail.com> wrote:

>Hi All,
>
>I bought a 93 cherokee sport a half year ago and the guy told me the
>ac does not work. I checked the repair records and saw a r134a
>conversion and charge by a professional in 2004. I tried charging it
>myself today. I located the low pressure port (bottom one on the back
>of the compressor with blue cap). First the system wouldn't except any
>gas, it just made the dial on the can of coolant shoot up and then the
>connector would hiss off when I removed it. Hmmmm, noticed that the
>compressor didn't turn on. Checked the forums and found out to jumper
>the low pressure switch. I was pleased to note that the compressor
>runs. However, when I connected the 134a coolant, expecting it to suck
>it up the gas, it once again did not seem to want to accept gas. Is
>there another valve that I need to open? Does anyone have any
>suggestions for how to trouble shoot this? I figure that I would just
>waste cans if I had a leak. That is why I think this behavior is kind
>of odd. I'm probably missing something easy here.
>
>Thanks for your help.
>
>Best,
>Breton


If you want to do this yourself properly I suggest you borrow, rent or
buy a set of gauges for R134 systems ans see what pressures you
actually have when compressor is running.
-----------------
TheSnoMan.com

Re: AC Charge 134a on a 93 cherokee sport
 

I am thinking that the Schraeder valve in your low side coupler is worn or
broken. I assume that you have one of those Autozone or similar "recharge
kits" with a low side coupler, a gauge and a combination can tap needle
valve. Correct me if I am wrong. With the valve off, you should be able to
connect to the low side coupler and read some pressure, unless it is
completely discharged. Now with the needle valve can taps, it is necessary
to screw the handle in to pierce the can, and then screw it out to release
the refrigerant into the system. Are you doing this? In Usenet, it is
necessary to ask, so don't take this personal.

If you have low pressure then you definitely have a leak in your system.
The problem I ran into in my Suburban is that AC repair jockeys would find
one leak, say, "That's it", and leave the rest of the leaks for the next
repair jockey to find. After paying for AC service two or three seasons in
a row, I got wise, bought my own gauges, replaced all the O-rings in the
system and the rear AC hoses that were actually leaking, and it is still
working after four seasons of moderate to heavy use.

Earle

"breton" <bretonh@gmail.com> wrote in message
news:1178558438.735906.31400@w5g2000hsg.googlegrou ps.com...
> Hi All,
>
> I bought a 93 cherokee sport a half year ago and the guy told me the
> ac does not work. I checked the repair records and saw a r134a
> conversion and charge by a professional in 2004. I tried charging it
> myself today. I located the low pressure port (bottom one on the back
> of the compressor with blue cap). First the system wouldn't except any
> gas, it just made the dial on the can of coolant shoot up and then the
> connector would hiss off when I removed it. Hmmmm, noticed that the
> compressor didn't turn on. Checked the forums and found out to jumper
> the low pressure switch. I was pleased to note that the compressor
> runs. However, when I connected the 134a coolant, expecting it to suck
> it up the gas, it once again did not seem to want to accept gas. Is
> there another valve that I need to open? Does anyone have any
> suggestions for how to trouble shoot this? I figure that I would just
> waste cans if I had a leak. That is why I think this behavior is kind
> of odd. I'm probably missing something easy here.
>
> Thanks for your help.
>
> Best,
> Breton
>

Re: AC Charge 134a on a 93 cherokee sport
 

I am thinking that the Schraeder valve in your low side coupler is worn or
broken. I assume that you have one of those Autozone or similar "recharge
kits" with a low side coupler, a gauge and a combination can tap needle
valve. Correct me if I am wrong. With the valve off, you should be able to
connect to the low side coupler and read some pressure, unless it is
completely discharged. Now with the needle valve can taps, it is necessary
to screw the handle in to pierce the can, and then screw it out to release
the refrigerant into the system. Are you doing this? In Usenet, it is
necessary to ask, so don't take this personal.

If you have low pressure then you definitely have a leak in your system.
The problem I ran into in my Suburban is that AC repair jockeys would find
one leak, say, "That's it", and leave the rest of the leaks for the next
repair jockey to find. After paying for AC service two or three seasons in
a row, I got wise, bought my own gauges, replaced all the O-rings in the
system and the rear AC hoses that were actually leaking, and it is still
working after four seasons of moderate to heavy use.

Earle

"breton" <bretonh@gmail.com> wrote in message
news:1178558438.735906.31400@w5g2000hsg.googlegrou ps.com...
> Hi All,
>
> I bought a 93 cherokee sport a half year ago and the guy told me the
> ac does not work. I checked the repair records and saw a r134a
> conversion and charge by a professional in 2004. I tried charging it
> myself today. I located the low pressure port (bottom one on the back
> of the compressor with blue cap). First the system wouldn't except any
> gas, it just made the dial on the can of coolant shoot up and then the
> connector would hiss off when I removed it. Hmmmm, noticed that the
> compressor didn't turn on. Checked the forums and found out to jumper
> the low pressure switch. I was pleased to note that the compressor
> runs. However, when I connected the 134a coolant, expecting it to suck
> it up the gas, it once again did not seem to want to accept gas. Is
> there another valve that I need to open? Does anyone have any
> suggestions for how to trouble shoot this? I figure that I would just
> waste cans if I had a leak. That is why I think this behavior is kind
> of odd. I'm probably missing something easy here.
>
> Thanks for your help.
>
> Best,
> Breton
>

Re: AC Charge 134a on a 93 cherokee sport
 

I am thinking that the Schraeder valve in your low side coupler is worn or
broken. I assume that you have one of those Autozone or similar "recharge
kits" with a low side coupler, a gauge and a combination can tap needle
valve. Correct me if I am wrong. With the valve off, you should be able to
connect to the low side coupler and read some pressure, unless it is
completely discharged. Now with the needle valve can taps, it is necessary
to screw the handle in to pierce the can, and then screw it out to release
the refrigerant into the system. Are you doing this? In Usenet, it is
necessary to ask, so don't take this personal.

If you have low pressure then you definitely have a leak in your system.
The problem I ran into in my Suburban is that AC repair jockeys would find
one leak, say, "That's it", and leave the rest of the leaks for the next
repair jockey to find. After paying for AC service two or three seasons in
a row, I got wise, bought my own gauges, replaced all the O-rings in the
system and the rear AC hoses that were actually leaking, and it is still
working after four seasons of moderate to heavy use.

Earle

"breton" <bretonh@gmail.com> wrote in message
news:1178558438.735906.31400@w5g2000hsg.googlegrou ps.com...
> Hi All,
>
> I bought a 93 cherokee sport a half year ago and the guy told me the
> ac does not work. I checked the repair records and saw a r134a
> conversion and charge by a professional in 2004. I tried charging it
> myself today. I located the low pressure port (bottom one on the back
> of the compressor with blue cap). First the system wouldn't except any
> gas, it just made the dial on the can of coolant shoot up and then the
> connector would hiss off when I removed it. Hmmmm, noticed that the
> compressor didn't turn on. Checked the forums and found out to jumper
> the low pressure switch. I was pleased to note that the compressor
> runs. However, when I connected the 134a coolant, expecting it to suck
> it up the gas, it once again did not seem to want to accept gas. Is
> there another valve that I need to open? Does anyone have any
> suggestions for how to trouble shoot this? I figure that I would just
> waste cans if I had a leak. That is why I think this behavior is kind
> of odd. I'm probably missing something easy here.
>
> Thanks for your help.
>
> Best,
> Breton
>

Re: AC Charge 134a on a 93 cherokee sport
 

I am thinking that the Schraeder valve in your low side coupler is worn or
broken. I assume that you have one of those Autozone or similar "recharge
kits" with a low side coupler, a gauge and a combination can tap needle
valve. Correct me if I am wrong. With the valve off, you should be able to
connect to the low side coupler and read some pressure, unless it is
completely discharged. Now with the needle valve can taps, it is necessary
to screw the handle in to pierce the can, and then screw it out to release
the refrigerant into the system. Are you doing this? In Usenet, it is
necessary to ask, so don't take this personal.

If you have low pressure then you definitely have a leak in your system.
The problem I ran into in my Suburban is that AC repair jockeys would find
one leak, say, "That's it", and leave the rest of the leaks for the next
repair jockey to find. After paying for AC service two or three seasons in
a row, I got wise, bought my own gauges, replaced all the O-rings in the
system and the rear AC hoses that were actually leaking, and it is still
working after four seasons of moderate to heavy use.

Earle

"breton" <bretonh@gmail.com> wrote in message
news:1178558438.735906.31400@w5g2000hsg.googlegrou ps.com...
> Hi All,
>
> I bought a 93 cherokee sport a half year ago and the guy told me the
> ac does not work. I checked the repair records and saw a r134a
> conversion and charge by a professional in 2004. I tried charging it
> myself today. I located the low pressure port (bottom one on the back
> of the compressor with blue cap). First the system wouldn't except any
> gas, it just made the dial on the can of coolant shoot up and then the
> connector would hiss off when I removed it. Hmmmm, noticed that the
> compressor didn't turn on. Checked the forums and found out to jumper
> the low pressure switch. I was pleased to note that the compressor
> runs. However, when I connected the 134a coolant, expecting it to suck
> it up the gas, it once again did not seem to want to accept gas. Is
> there another valve that I need to open? Does anyone have any
> suggestions for how to trouble shoot this? I figure that I would just
> waste cans if I had a leak. That is why I think this behavior is kind
> of odd. I'm probably missing something easy here.
>
> Thanks for your help.
>
> Best,
> Breton
>

Re: AC Charge 134a on a 93 cherokee sport
 

breton wrote:
> Hi All,
>
> I bought a 93 cherokee sport a half year ago and the guy told me the
> ac does not work. I checked the repair records and saw a r134a
> conversion and charge by a professional in 2004. I tried charging it
> myself today. I located the low pressure port (bottom one on the back
> of the compressor with blue cap). First the system wouldn't except any
> gas, it just made the dial on the can of coolant shoot up..
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^

STOP right there!

You used the high side port. The connector off the compressor is
the high-side no matter what the cap color is.

The low side is between the condenser and the evaporator. The
smallest line in the system that runs from the firewall.

What bugs me is the connector should not have fit unless the
shop that did the mod buggered something up.

--
DougW