Quote:
Originally Posted by GH85Carrera
I have never before seen anyone say that.
From everything I have ever read or heard a vacuum is very necessary before a recharge if you want the AC system to function.
There will be a lot of moisture in the system, and about 14 psi of pressure of air. Air is not a refrigerant. The moisture will freeze and clog up the expansion valve.
I run my vacuum pump for long time to make sure all the moisture is boiled out. I am a belts and suspender type. I pressurize the system with dry nitrogen after pulling a vacuum and then pull a vacuum again. I want a DRY system.
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It depends almost entirely as to how long the system was open to atmosphere. In the above case pulling a vacuum will be required.
Whereas a simple QUICK replacement of a failed pressure sensor would likely not require....