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Mine read higher than normal last year too. I still put some in and that fixed it. What kind of numbers are you talking?
The only other thing I can recall with doing A/C work and having excessive pressure is that you could have a blockage somewhere causing more pressure. But I think if that's the case then the other line should read low. I wasn't certified to mess with A/C stuff so most of the time when it came to the freon end of the job, my boss would jump in and finish it up.
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