The a/c clutch will not engage and the compressor will not come on.............
This could be because you have a leak in you A/C system causing a loss of freon. When there is not enough freon in your system the A/C compressor will not engage, it will harm the compressor.
An air conditioner clutch will not engage without voltage. If it doesn't engage, the compressor will not turn.
You don't need to engage the compressor clutch to recharge the system. In fact, you shouldn't engage it without refrigerant and oil in it, because the refrigerant carries the compressor oil in order to lubricate the compressor. But, to answer your question, you disconnect the low pressure switch, and run a jumper wire between the two female ends of the connector.
Most Likely refrigerant charge is low -- compressor will not engage unless system has proper pressure
Dont jump them, its not a switch, its a transducer and you could wreck your pcm by jumping the wrong one. Run a power wire directly to your compressor to get the clutch to engage. If it doent engage then, it is your clutch. Remember to first check refridgerant level and fuses/relays. Good luck.
This happens to keep the fluid in the compressor viable. If it sits too long, it can become unusable.
The clutch receives it's signal to engage from a pressure switch in the system. If there is insufficient refrigerant in the system the pressure switch will not close resulting in no power at the compressor clutch to make it engage.
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It sounds like you have a very tight running or bad a/c compressor since most all systems will engage the compressor when the defroster is on...............
You should be able to hear it engage-there is a clutch. If not, check the hot wire when someone turns on with a test light. If it has juice & does not engage, you may have a problem.