bought a new compressor for air conditioner it wont turn on
why wont my replacement compressor for air condtioner turn on
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If the AC compressor doesn’t turn on, the most common culprit by far is low AC refrigerant. If there is a leak, no matter how small, it’ll eventually cause a non-working AC system. Another possible issue is a blown fuse and/or relay. Your owner’s manual should be able to tell you where those are located. Poor grounding, frayed wiring, bad clutch coil, and defective AC pressure sensor switch can also be an issue although less common.
After testing the AC for the amount of PSI in both low and high-pressure lines, re-fill the AC and monitor the gauges carefully. Some AC refrigerants already come with the gauges built-in.
If you suspect there is a leak when re-filling the AC refrigerant, a dye can be used so that next time it stops working, the dye will be visible when you check it in the dark with a UV light.
Any leaks will glow in the dark (greenish-glow). I would recommend starting at the A/C compressor and going along the A/C lines inspecting all areas carefully.
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Check that suction line pressure is above 25psi. It should be since it isn't running. If not... that's why. If it is, find the low pressure switch. It'll be either somewhere on the suction line, or, like some vehicles I've had, it's on the accumulator (big round tank on suction side of circuit... might not be called that but that's what it reminds me of from refrigeration). If you have enough pressure do a continuity test after unplugging the electrical connector. You should have continuity. If reading OL, switch is bad. Otherwise check the clutch coil, incoming power, and ground.
von brandon k