Anyone converted 4.0L from R12 to R134a?
07-18-2006, 09:27 PM
#1
Guest
Posts: n/a
Anyone converted 4.0L from R12 to R134a?
I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
had an AC guy try to recover the R12, but he said it was 98% air. I'm
using one of the InterDynamics kits and thought everything was going
smoothly. Even though the instructions did not mention it, someone
told me that I needed to remove the valve core from the low side port,
since the conversion kit supplied adaptor fitting already has one. I
have a valve core removal tool, but I can't seem to locate the valve
core inside the fitting. After installing the adapter fittings, I
tried to add some R134, but the meter is saying that it's overcharged.
I don't believe that any R134 is even making it into the system.
Another guy told me that I need to pull a vacuum on it. Has anyone
else had this problem before?
Thanks,
Sam
had an AC guy try to recover the R12, but he said it was 98% air. I'm
using one of the InterDynamics kits and thought everything was going
smoothly. Even though the instructions did not mention it, someone
told me that I needed to remove the valve core from the low side port,
since the conversion kit supplied adaptor fitting already has one. I
have a valve core removal tool, but I can't seem to locate the valve
core inside the fitting. After installing the adapter fittings, I
tried to add some R134, but the meter is saying that it's overcharged.
I don't believe that any R134 is even making it into the system.
Another guy told me that I need to pull a vacuum on it. Has anyone
else had this problem before?
Thanks,
Sam
07-18-2006, 10:56 PM
#2
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
redlinescooby@hotmail.com wrote:
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
It's always a very good idea to throughly pump down a system if you are
changing the refrigerant.
Is it possible that your gage is measuring the high side instead of the
low side? And you did open the valves right? I don't mean to be
insulting but speaking for myself I've had more trouble overlooking the
stupidest things that were obvious in retrospect.
I don't recommend this but I installed AC on a vehicle that didn't have
it before, and used a factory evaporator designed for R12 with a modern
compressor (along with new everything else). This being a new install
it was of course full of air at normally air pressure. Not having the
proper equipment to pump it down and then put in just the right amount
of refrigerant (and just how much R-134a does a non stock AC unit in a
Studebaker take anyway?!) I started putting refrigerant in until the
unit was blowing cold and the gage was in the green, worked just fine.
Good luck!
Jeff DeWitt
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
It's always a very good idea to throughly pump down a system if you are
changing the refrigerant.
Is it possible that your gage is measuring the high side instead of the
low side? And you did open the valves right? I don't mean to be
insulting but speaking for myself I've had more trouble overlooking the
stupidest things that were obvious in retrospect.
I don't recommend this but I installed AC on a vehicle that didn't have
it before, and used a factory evaporator designed for R12 with a modern
compressor (along with new everything else). This being a new install
it was of course full of air at normally air pressure. Not having the
proper equipment to pump it down and then put in just the right amount
of refrigerant (and just how much R-134a does a non stock AC unit in a
Studebaker take anyway?!) I started putting refrigerant in until the
unit was blowing cold and the gage was in the green, worked just fine.
Good luck!
Jeff DeWitt
07-18-2006, 10:56 PM
#3
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
redlinescooby@hotmail.com wrote:
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
It's always a very good idea to throughly pump down a system if you are
changing the refrigerant.
Is it possible that your gage is measuring the high side instead of the
low side? And you did open the valves right? I don't mean to be
insulting but speaking for myself I've had more trouble overlooking the
stupidest things that were obvious in retrospect.
I don't recommend this but I installed AC on a vehicle that didn't have
it before, and used a factory evaporator designed for R12 with a modern
compressor (along with new everything else). This being a new install
it was of course full of air at normally air pressure. Not having the
proper equipment to pump it down and then put in just the right amount
of refrigerant (and just how much R-134a does a non stock AC unit in a
Studebaker take anyway?!) I started putting refrigerant in until the
unit was blowing cold and the gage was in the green, worked just fine.
Good luck!
Jeff DeWitt
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
It's always a very good idea to throughly pump down a system if you are
changing the refrigerant.
Is it possible that your gage is measuring the high side instead of the
low side? And you did open the valves right? I don't mean to be
insulting but speaking for myself I've had more trouble overlooking the
stupidest things that were obvious in retrospect.
I don't recommend this but I installed AC on a vehicle that didn't have
it before, and used a factory evaporator designed for R12 with a modern
compressor (along with new everything else). This being a new install
it was of course full of air at normally air pressure. Not having the
proper equipment to pump it down and then put in just the right amount
of refrigerant (and just how much R-134a does a non stock AC unit in a
Studebaker take anyway?!) I started putting refrigerant in until the
unit was blowing cold and the gage was in the green, worked just fine.
Good luck!
Jeff DeWitt
07-18-2006, 10:56 PM
#4
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
redlinescooby@hotmail.com wrote:
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
It's always a very good idea to throughly pump down a system if you are
changing the refrigerant.
Is it possible that your gage is measuring the high side instead of the
low side? And you did open the valves right? I don't mean to be
insulting but speaking for myself I've had more trouble overlooking the
stupidest things that were obvious in retrospect.
I don't recommend this but I installed AC on a vehicle that didn't have
it before, and used a factory evaporator designed for R12 with a modern
compressor (along with new everything else). This being a new install
it was of course full of air at normally air pressure. Not having the
proper equipment to pump it down and then put in just the right amount
of refrigerant (and just how much R-134a does a non stock AC unit in a
Studebaker take anyway?!) I started putting refrigerant in until the
unit was blowing cold and the gage was in the green, worked just fine.
Good luck!
Jeff DeWitt
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
It's always a very good idea to throughly pump down a system if you are
changing the refrigerant.
Is it possible that your gage is measuring the high side instead of the
low side? And you did open the valves right? I don't mean to be
insulting but speaking for myself I've had more trouble overlooking the
stupidest things that were obvious in retrospect.
I don't recommend this but I installed AC on a vehicle that didn't have
it before, and used a factory evaporator designed for R12 with a modern
compressor (along with new everything else). This being a new install
it was of course full of air at normally air pressure. Not having the
proper equipment to pump it down and then put in just the right amount
of refrigerant (and just how much R-134a does a non stock AC unit in a
Studebaker take anyway?!) I started putting refrigerant in until the
unit was blowing cold and the gage was in the green, worked just fine.
Good luck!
Jeff DeWitt
07-18-2006, 11:16 PM
#5
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
You need to evacuate all the air from the system, using a vacuum pump, like
this one.
http://www.acsource.com/index.asp?Pa...ROD&ProdID=427
That's a good price too!
There should be a valve core inside the original low side port. Perhaps you
have the wrong valve core removal tool.
Earle
<redlinescooby@hotmail.com> wrote in message
news:1153272471.441132.176100@p79g2000cwp.googlegr oups.com...
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
this one.
http://www.acsource.com/index.asp?Pa...ROD&ProdID=427
That's a good price too!
There should be a valve core inside the original low side port. Perhaps you
have the wrong valve core removal tool.
Earle
<redlinescooby@hotmail.com> wrote in message
news:1153272471.441132.176100@p79g2000cwp.googlegr oups.com...
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
07-18-2006, 11:16 PM
#6
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
You need to evacuate all the air from the system, using a vacuum pump, like
this one.
http://www.acsource.com/index.asp?Pa...ROD&ProdID=427
That's a good price too!
There should be a valve core inside the original low side port. Perhaps you
have the wrong valve core removal tool.
Earle
<redlinescooby@hotmail.com> wrote in message
news:1153272471.441132.176100@p79g2000cwp.googlegr oups.com...
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
this one.
http://www.acsource.com/index.asp?Pa...ROD&ProdID=427
That's a good price too!
There should be a valve core inside the original low side port. Perhaps you
have the wrong valve core removal tool.
Earle
<redlinescooby@hotmail.com> wrote in message
news:1153272471.441132.176100@p79g2000cwp.googlegr oups.com...
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
07-18-2006, 11:16 PM
#7
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
You need to evacuate all the air from the system, using a vacuum pump, like
this one.
http://www.acsource.com/index.asp?Pa...ROD&ProdID=427
That's a good price too!
There should be a valve core inside the original low side port. Perhaps you
have the wrong valve core removal tool.
Earle
<redlinescooby@hotmail.com> wrote in message
news:1153272471.441132.176100@p79g2000cwp.googlegr oups.com...
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
this one.
http://www.acsource.com/index.asp?Pa...ROD&ProdID=427
That's a good price too!
There should be a valve core inside the original low side port. Perhaps you
have the wrong valve core removal tool.
Earle
<redlinescooby@hotmail.com> wrote in message
news:1153272471.441132.176100@p79g2000cwp.googlegr oups.com...
> I have a 91 Cherokee that I'm trying to convert from R12 to R134a. I
> had an AC guy try to recover the R12, but he said it was 98% air. I'm
> using one of the InterDynamics kits and thought everything was going
> smoothly. Even though the instructions did not mention it, someone
> told me that I needed to remove the valve core from the low side port,
> since the conversion kit supplied adaptor fitting already has one. I
> have a valve core removal tool, but I can't seem to locate the valve
> core inside the fitting. After installing the adapter fittings, I
> tried to add some R134, but the meter is saying that it's overcharged.
> I don't believe that any R134 is even making it into the system.
> Another guy told me that I need to pull a vacuum on it. Has anyone
> else had this problem before?
>
> Thanks,
>
> Sam
>
07-19-2006, 12:40 AM
#8
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
Jeff DeWitt wrote:
<<snip>>
> >
> > Sam
> >
>
> It's always a very good idea to throughly pump down a system if you are
> changing the refrigerant.
More than that a necessity. Venturi type pumps will not get them down
enough by themselves.
>
> Is it possible that your gage is measuring the high side instead of the
> low side? And you did open the valves right? I don't mean to be
> insulting but speaking for myself I've had more trouble overlooking the
> stupidest things that were obvious in retrospect.
>
> I don't recommend this but I installed AC on a vehicle that didn't have
> it before, and used a factory evaporator designed for R12 with a modern
> compressor (along with new everything else). This being a new install
> it was of course full of air at normally air pressure. Not having the
> proper equipment to pump it down and then put in just the right amount
> of refrigerant (and just how much R-134a does a non stock AC unit in a
> Studebaker take anyway?!) I started putting refrigerant in until the
> unit was blowing cold and the gage was in the green, worked just fine.
No two A/C installs take exactly the same amount.
07-19-2006, 12:40 AM
#9
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
Jeff DeWitt wrote:
<<snip>>
> >
> > Sam
> >
>
> It's always a very good idea to throughly pump down a system if you are
> changing the refrigerant.
More than that a necessity. Venturi type pumps will not get them down
enough by themselves.
>
> Is it possible that your gage is measuring the high side instead of the
> low side? And you did open the valves right? I don't mean to be
> insulting but speaking for myself I've had more trouble overlooking the
> stupidest things that were obvious in retrospect.
>
> I don't recommend this but I installed AC on a vehicle that didn't have
> it before, and used a factory evaporator designed for R12 with a modern
> compressor (along with new everything else). This being a new install
> it was of course full of air at normally air pressure. Not having the
> proper equipment to pump it down and then put in just the right amount
> of refrigerant (and just how much R-134a does a non stock AC unit in a
> Studebaker take anyway?!) I started putting refrigerant in until the
> unit was blowing cold and the gage was in the green, worked just fine.
No two A/C installs take exactly the same amount.
07-19-2006, 12:40 AM
#10
Guest
Posts: n/a
Re: Anyone converted 4.0L from R12 to R134a?
Jeff DeWitt wrote:
<<snip>>
> >
> > Sam
> >
>
> It's always a very good idea to throughly pump down a system if you are
> changing the refrigerant.
More than that a necessity. Venturi type pumps will not get them down
enough by themselves.
>
> Is it possible that your gage is measuring the high side instead of the
> low side? And you did open the valves right? I don't mean to be
> insulting but speaking for myself I've had more trouble overlooking the
> stupidest things that were obvious in retrospect.
>
> I don't recommend this but I installed AC on a vehicle that didn't have
> it before, and used a factory evaporator designed for R12 with a modern
> compressor (along with new everything else). This being a new install
> it was of course full of air at normally air pressure. Not having the
> proper equipment to pump it down and then put in just the right amount
> of refrigerant (and just how much R-134a does a non stock AC unit in a
> Studebaker take anyway?!) I started putting refrigerant in until the
> unit was blowing cold and the gage was in the green, worked just fine.
No two A/C installs take exactly the same amount.
