I need to buy a new relay to replace the one located in the relay box behind the battery but i dont know if its the AC COMPRESSOR RELAY or AC CLUTCH RELAY. ( in the cover for the relay box it says AC MG)

yes, it could be your thermostat or the AC main relay. AC relay is located in the fuse box inside your engine bay.

The only thing it could be is the conrtol wire of the A/C compressor clutch relay is shorted to one of the wires grounding at the alternator . The PCM - engine computer controls the grounding for the A/C compressor clutch relay. Find the A/C compressor clutch relay in the under hood fuse box , pull the relay out of the fuse box an look on the bottom . You will see four sets of numbers . 30 & 87 plus 85 & 86 . Take an ohm meter an check pin 85 to ground with the ground wire's behide the alternator connected , you will have continuity . Disconnect the ground behind the alternator an you will probably have a open circuit . When the motor was changed wire's were pinched or something . Most likely . Here , check out the wiring diagram http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on HVAC , then under subsystem click on HVAC controls . Click the search button ,then the blue link . Fourth diagram down is for the A/C compressor clutch relay circuit. Don't know if know how a computer controlled relay circuit work's . Looking at the diagram .The DB/OR - dark blue with orange trace wire would have to be shorted to one of those ground wire's for the compressor clutch to stay engaged .

There should be a 15amp fuse for the compressor in the box next to the battery, also a wide open throttle relay and two pressure switches that can prevent power to the ac clutch.

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.

First, try replacing the Vent/AC air filter located behind the glove compartment. If this doesn't fix the problem, you may have a failed compressor relay, in the relay box near the battery.
If all else fails, you may have a failed compressor/clutch.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

the ac clutch relay is the problem. It is located in the under hood fuse box. It is a $10 part. The relay will make a clicking sound when activated but the contacts inside are burnt causing no electrical flow to the ac compressor. Simply unplug and replace. The relay is labeled M/G CLT .

replace or blow out the cabin air filter as well. It is located behind the glove box. Instructions are in your owners manual.

the ac clutch relay fails often. It is located in the fuse box next to the battery under the hood. it is labeled M/G CLT. You can buy one from rockauto.com for $11. You can test by swapping the relay in the fuse box with a similar one. also clean or replace the cabin air filter located behind the glove box.

Clean the in cabin air filter located behind the glove box. See owners manual for directions. The AC clutch relay may need replacement. $11 from rockauto.com. The relay is located under the hood in the fuse box next to the battery. It is labeled M/G CLT.

Could be bad AC clutch relay. Just replaced mine ($11 at autozone). It is located in the relay box just behind the battery.

check the compressor clutch relay. The contacts may have fused together. If there is something constantly enegizing the coils then it is either a bad switch or a shorted lectronic component, usually a single transistor inside an electronic control box.