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How do you charge the ac on a 1990 silverado w r-12?

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βˆ™ 2009-06-08 22:05:50

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First the low side port should be identified, connecting w/ a set of guages- apply at least 28" of vacuum for ten minutes. If the reading on your guages (vacuum) moves (loses) vacuum in 15 minutes don't charge the system- you have a leak. If the vacuum guage doesn't move (leak) then charge with the proper amount of refrigerant gas.

2009-06-08 22:05:50
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Q: How do you charge the ac on a 1990 silverado w r-12?
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