Quote:
Originally Posted by jimthe1st
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....
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Let's say you pulled out the refrigerant until the system pressure settled to atmospheric pressure. Only stuff goes out. Nothing goes in. Then you change the hypothetical switch in 13 seconds in AZ on a 110F day. Little to no moisture enters but you have no vacuum.
What is the operational impact on a system if you then fill your system up with refrigerant?