Low Side for /AC...
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Freshman User
Joined: May 2008
Posts: 37
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Low Side for /AC...
anyone know wich one is the low side for the 6.9 ? My compressor spins freely by hand so im sure it just needs a charge and done this tons of times but not to a Ford ... can anyone help and about how many 1lb cans will out system hold ?
Posting Guru
Joined: Mar 2005
Posts: 1,701
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From: KY
I have converted several systems and we first tried to use the % thing. We learned that every vehicle is different. AC is precision guess work. To many variables involved.
The new vehicles out now are tough to work on or next to impossible without a new machine. A tenth of a ounce is critical now.
The new vehicles out now are tough to work on or next to impossible without a new machine. A tenth of a ounce is critical now.
Elder User
Joined: Aug 2007
Posts: 728
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when installing 134 be sure to add the proper amount of PAG oil or ESTER
the mineral oil used with r-12 is not compatible with 134
and when using 134 it has a tendency to expand as the system heats up
you could always charge an r-12 system to the correct pressures qucikly and you were done
but if you try it with 134 the pressures will continue to rise as the system heats up and then it is overcharged and an overcharged 134 system wont cool either
the mineral oil used with r-12 is not compatible with 134
and when using 134 it has a tendency to expand as the system heats up
you could always charge an r-12 system to the correct pressures qucikly and you were done
but if you try it with 134 the pressures will continue to rise as the system heats up and then it is overcharged and an overcharged 134 system wont cool either
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Elder User
Joined: Aug 2007
Posts: 728
Likes: 0
nearly forgot . the way you can identify the pressure fittings is that the one on the smallest a/c line is the high pressure and the low pressure is always on the large line or teh accumulator located in it
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Posting Guru
Joined: Mar 2005
Posts: 1,701
Likes: 0
From: KY
when installing 134 be sure to add the proper amount of PAG oil or ESTER
the mineral oil used with r-12 is not compatible with 134
and when using 134 it has a tendency to expand as the system heats up
you could always charge an r-12 system to the correct pressures qucikly and you were done
but if you try it with 134 the pressures will continue to rise as the system heats up and then it is overcharged and an overcharged 134 system wont cool either
the mineral oil used with r-12 is not compatible with 134
and when using 134 it has a tendency to expand as the system heats up
you could always charge an r-12 system to the correct pressures qucikly and you were done
but if you try it with 134 the pressures will continue to rise as the system heats up and then it is overcharged and an overcharged 134 system wont cool either