It does have green, yellow and red zones, but I don't know that all AC systems run at the exact same pressures, plus there is a lot of variation depending on the ambient temperature. The pressure can range from 5 to 10 psi or more, it seems, between cold, warm and when the engine is hot. Some exact numbers would definitely be beneficial in knowing whether I am under or over, as I do get some occasional cycling of the compressor clutch.
KuoH
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Originally Posted by Earthworm
Do they not mark the acceptable pressure range right on the gauge?
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