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Where is the relay for the a/c compressor - Cars & Trucks

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Posted on Jul 15, 2013

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See the picture attached. God bless you
where is the relay for the a/c compressor - e46600e6-b5aa-4dcb-bb63-25a2bf5e5ca8.jpeg

Posted on Jul 15, 2013

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04 navigator is blowing ac fuse 11, ac coil shorted, 3 different coils, can ac compress short the coils


How did you hook up the inline fuse to compressor and ground to compress ? Ground what ? Right at the clutch coil ? You have to be hooking it up wrong . The compressor can't cause the clutch coil to short or blow the fuse , even if the compressor were seized up . An before that would have the serpentine belt would burn up , squealing noise. applying B+ voltage in the relay socket ,pin 30 to pin 87 will engage the compressor clutch . If the fuse blows the wiring from the relay to the compressor clutch is shorted to ground . Look for rubbed through wiring harness .

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Pull a relay out and use paper clip to jump. Usually cross corner. Watch compressor clutch and see if engages when key is turn ahead. Don't start car. If it does good. Now take alligator clips and check relay. Clip each wire to negative and positive battery post. Then clip negative to negative relay pin. And touch positive to correct pin. If it doesn't click do it another relay so you know your doing it right. If determined relay is good. And your compressor clutch did engage when testing it. You are low on freon.

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The ground on a compressor is usually the body of the compressor itself, which is then earthed to the engine. The supply to the relay coil should be at 12 volt DC or whatever voltage your car is. When the aircon is turned on, the coil should retract the contacts in the relay. The contacts are the on / off for the compressor magnetic pulley. The other side of the relay coil is to earth (Body of the car.) If there is power on one side but not on the other side of the relay contact, it means the relay is shot. If you connect wires from both sides of the relay, the compressor should engage. ( DO NOT join the coil wires, it will be a dead short! Join the supply wires for the compressor.

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If power is not found at the a/c clutch, the relay is faulty. If power is found, suspect a bad ground, or a defective compressor. the relay in your car controls the ac compressor, but check main a/c fuse first, to see if that is ok! is power going from switch to relay. if so the relay is bad. thats why it will not go to compressor. Good-day! But you can go to this site for more info--.ehow.com/how_5730046_tell-bad-ac-relay

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Refrigerant may have leaked out to a level compressor will not come on ck levels w guages

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2008 Honda Civic dx rebuilt AC compressor always on regardless of controls


OOPS ! Now, it sounds like the A/C relay is constantly on. In the power distribution box by the battery, try swapping another relay for the A/C relay (which turns the compressor on), and see if it now stops. If so, buy a new relay. Good luck.

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Check for broken wiring, blown fuses, possible bad relays, and look at the pressure switch. Some systems have a high pressure switch (some have a low pressure also) that prevent the compressor from running. If it is faulty or damaged, it could be preventing the compressor from running. Wire damage could be possible with front end damage.

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  • Under the hood in the relay panel will be a relay for the compressor. When you locate the relay box look on the underside of the lid for the legend (layout) of the relays. Pulling that relay will stop the compressor from turning on.
  • You can also just unhook the connector on the compressor and secure it to stop the compressor from turning on.
  • If you need the compressor clutch to not turn at all, like if the bearings are bad, then you need to buy a smaller belt to bypass the compressor all together.

  • Hope this helps and thank you for using FixYa.

Regards, Tony

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1996 Lincoln Town Car. The A/C compressor will not engage. Freon is not an issue because I have by-passed the low pressure cycle switch. The control in the car is on "max ac". I have also replaced the A/C...


Is the solenoid clutch holding on to engage the compressor, if not the relay or the fuse or the sitch is not active. check the connection to the relay.
If solenoid is turning the compressor then there is no pumping and so the cooling does not happen.It can be failure within the compressor, needs an overhauling .

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the control unit is no good.i had a similar situation with a 98 tracker,and installed a switch to give it a ground for the compressor relay that comes from the a/c computer module.
it works good and goes on and off with the a/c switch.

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