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Old 12-29-2016, 05:21 PM   #7
brcidd
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Re: 01 Chevy Venture Cooling Fans & AC Not Working

If you buy a refill kit- attach the gauge hose to the low side port (do not open can valve) and read the system pressure, you'll know if it has any refrigerant pressure in it. If it reads zero- all refrigerant is gone. If it reads above 47 psi, then you have at least enough to activate the compressor. From here- I will say you have less than 47 psi, since compressor does not come on.

If all refrigerant is gone- you have a massive leak- listen for hisses if you decide to add some.

You can add to a system where compressor is not running- the pressure from the can will pressurize the system to activate the compressor.

Also you can have a system that reads 80 psi and only have 5% of the needed refrigerant in it. This is why it is important to "weigh in" the refrigerant- to get the correct amount in the system.
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Automotive A/C Engineer with:
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'94 Astro- 370k miles
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