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The make and model doesn't matter - the correct pressures for an R134a system in one vehicle is the same as the other. What the pressures are supposed to read can vary greatly. There's a little something called the 'pressure/temperature' relationship. In short, the ambient air temperature and humidity level are going to impact what the correct system pressure should be. So, depending on what the ambient air temperature and humidity level is, the correct operating pressure can be anywhere from 28 - 60 psig on the low side, and anywhere from 130 - 350 psig on the high side.

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Q: What is the correct operating pressures for R134a refrigerant in a 2003 dodge ram truck air conditioner?
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