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When you say too high, just how high is it and what is the high side pressure. It is not uncommon for the suction pressure(lowside) to get up to 80psi on a very hot day. You cannot determine what is wrong unless more information is provided. It could be that your system is overcharged, but without the high side pressure and the temp of the suction line it is hard to give the right answer.

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Q: What would cause the low side on an air conditioner to be too high?
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