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Posted on Jan 02, 2017
You should never connect a 12volt to the compressor solenoid.unless you unplug it first, because on some cars the ac solenoid is driven by an electronic circuit. Semiconductors are very sensitive to excessive current. I once had to repair the computer on a mercedes because the other mechanic did that. Luckily I know how to repair electronic circuits, or they would have bought a 500 dollars computer the little chip that blew only costed a dollar fifty cents at radio shack,.LOL. Anyways back to your problem, Have you checked if there is a leak, and all the refrigerant might have leaked out? This would prevent the compressor from coming on. Along the ac line there is a switch, sometimes by the reciever drier, when the system looses refrigerant the pressure inside drops and that pressure switch disable the compressor. , and the compressor wont come on. This is to protect the compressor, because it will be damaged if you run it without refrigerant. Ac clutch solenoid is usually is not driven by relay, because an ac solenoid don't really take much current to to kick in, unless of course it is shorted. It would either be directly from the inside switch usually in series with the fan control or driven by a small transistor in a circuit, and the electronic circuit is driven by the ac controls inside. I think the problem with your ac is that it has no refrigerant thats why the compressor wont come on.
Posted on Jun 27, 2009
sounds like lack of gas pressure,take it to specialist and and get it recharged to the correct weight of gas,it is positivly dangerous to play with this because the A/C uses high pressures and can cause frostbite in 2 seconds when trying to refill with these boy racer silly aftermarket top up cans.THESE SHOULD BE BANNED WORLDWIDE
Posted on Jun 28, 2009
On my 2000 Mazda B3000 it's up underneath the dash right by the steering column, like they said, blue plastic square relay
Posted on Apr 07, 2010
Hi, the relays should be in the box under the hood. Check the INJ fuse and the PUMP fuses. If those are good, interrogate the relay socket using a voltmeter or 12 volt test light. Connect the test light clip or voltmeter probe to chassis ground and probe the relay socket. With the key off, there should be one hot terminal. With the key on, there should be 2 hot terminals. If not, the MAIN RELAY is not coming on and you will need to interrogate that relay socket as well. If there are 2 hot terminals in the PUMP RELAY socket with the key on, move the test light clip/probe to battery positive and probe the socket again. You should get similar results from the other 2 terminals in the socket. The pump terminal may be only a dim light, but the terminal from the ECM should be a bright light/battery voltage. If not, the ECM is not turning the relay on--possibly due to the anti-theft system or some other safety feature. Please let me know if you have questions, and thanks for using FixYa.
Posted on Aug 14, 2011
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