A/C Question
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From: Tuscumbia , Al
A/C Question
78 F150 factory 460 eng with factory air.
Changed system to R-134a what oil do i need to use in system Also what should the High and Low pressures run with 134a installed
Changed system to R-134a what oil do i need to use in system Also what should the High and Low pressures run with 134a installed
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PAG Oil for R134A and a good rule of thumb for high side pressures is 2-2.5 X the ambient temperature....
So if it is 90 degrees outside when you charge the system you would be looking at a range of 180-225.
The Low side is usually 35-40. But really, pay more attention to the high side readings. If you get some funky readings post back so we can trouble shoot.
Most newer gauge sets will have the ambient temperature scale on the dial face which makes it easy as well.
Josh
So if it is 90 degrees outside when you charge the system you would be looking at a range of 180-225.
The Low side is usually 35-40. But really, pay more attention to the high side readings. If you get some funky readings post back so we can trouble shoot.
Most newer gauge sets will have the ambient temperature scale on the dial face which makes it easy as well.
Josh
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From: Tuscumbia , Al
[quote=marcograms;9039088]Please post some pics rwlacks. I have an F150 with factory 460 too.
[/quot
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