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I'm going to be doing a change over to the 134a refrigerant.
I have read all I need too on the subject and there is a lot of great info here in the Brickboard.
However currently I have the R12 and it is low and the compressor is just cycling on and off. I can get the compressor to run continuous when jumped at the cycle switch. So I know the compressor is working.
The question is, what is the high pitched sounding whistle I hear just before the compressor cycles on? Is this because it is low on refrigerant? I never heard this before and only happens when I switch the A/C on.
Other than that I believe I am ready to do the change.
Thanks.
JW
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