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Message: <blockquote data-quote="swampratt" data-source="post: 4084692" data-attributes="member: 15054">Hook some ac gauges to the low/suction side and you can see the Compressor come on if you leave it off then turn it on and read the pressure.Should be higher when off maybe somewhere in the 150 psi area and then pull down to 70-85 psi or so when running in this heat.If it is in the 30-50 psi area when running it is low on freon.Numbers look like a 3.5 ton unit.Go get the new capacitor at lock supply or johnstone supply and retest.Take your old one in and hand it to them and they will give you the proper one.I see yours still has a readable sticker.</blockquote>