Quote:
Originally Posted by LantanaTX
Never had to replace a dryer before when doing this, but the system must be evacuated before charging.
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Actually you can even forgo the evacuation (coming from multiple experts, shops and my own experience) if the system has not been left open long, especially if a
new dryer is installed. It takes out moisture.
It's like turning the rotors for a good brake job.
You don't have to, and you may get away without doing it a time or two
but a good brake job says, yah, ya need to.
PS all this applies if you simply adding R134a to an existing R134a system. If you're converting from R12, oh boy. A completely different animal. Been there done that.