A/C compressor is not engaging

check the freon, if there isn't enough it won't engage, could also be the low pressure switch or a fuse.

i think you are low on freon. your compressor clutch wont engage when you are low lift your hood and turn air off watch the compressor and have someone turn on the air and see if clutch engages on the compressor good luck

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.

if the pressure of freon is to low the pressure switch on the receiver will keep it from running(the alum can near the firewall

If all you get is hot air there are several possibilities. The compressor is driven by the serpentine belt and is engaged and disengaged by an electric clutch mounted on the compressor drive pulley. With the engine running, have an assistant turn on the AC while you observe the AC compressor clutch. If the clutch engages, you can be reasonably sure that the system has freon, and the electric circuit is OK. If the clutch doesn't engage, which is the most likely situation, either you are low on freon, the AC clutch relay is inop, or AC compressor fuse is open (blown). A search of Google images will give you the location of the AC relay. You can pull out the relay, carefully remove the cover, reinsert the relay, and engage the compressor clutch by manually closing the relay contacts. Warning: do this only for a second or two in order to see the clutch engage. If the clutch does engage, then you are probably low on freon. There is a safety switch that prevents the clutch from operating if there is not enough freon in the system. Hopefully, this is the case. Go to Walmart and get two cans of r-134 and the inexpensive kit, and following their instructions, charge your system. If this is not the problem, you'll need a set of AC gauges and the skill to use them. Hope this helps. Dano

The A/C pump ismade of three seperate components. You are correct in it being electrical, to some degree. The compressor is self turnes, & in turning moves the freon thru the condensor,dryer, evaporator, & condensor. With the engine off, you can grab the clutch on the compressor, & turn it manually. Now, to your question. When you turn on your A/C, it sends a signal to one of 3 parts on your A/C compressor. The 1st signal, is a charge to the magnet (not its nomenclature name) that pulls the clutch, quickly, into the compressor shaft, so it can start turning. Now as this signal, is working,on an intermittant basis, 1 your clutch has been damaged, not always engaging fully,causing disc wear. The activating magnet, works intermittantly, this too, strains the electrical wiring, going thru the compressor to the magnet. Now the compressor works, but, 2 components, have gotten very hot, by intermittant action. To remove them, if "fused", will be labor intensive. Thanhaving a "sealed" system, dis-assembled, then re-assembled on a mechanics work table. No matter how hard I try its never completely clean......the repaired compressor can allow harmful contaminates into a system that works, with one part not working. Once contaminates are in the system......all the components can be damaged. The mechanic, is giving you the most cost efficieant repair, that will last longest, with least possiblility of failure.

The compressor has to be operating when adding freon, some one disconected the wire so it wouldn't burn up the compressor or maybe the wires got tangeled up around the serpentine belt and ripped it off, the best bet is to go to a bone yard and look at a ciera there and grab what you need, your going to need the connector anyways.

If you have no owners manual,can't find fuses or bulbs,
your done.

If they tried to turn the compressor & it is frozen, you
need a new one. Did you try & turn it with a socket?

Does the clutch engage when you power it directly?

sounds like compressor clutch is trying to engage
so I would buy an a/c recharge kit get the one with a sealer in it follow the directions on package then if your clutch kicks in your good to go... if this don't work or only works for a day or two then need to find where system is leaking by a pro... I would be more worried about your amp overheating ...

Did you try jumping where the Clutch relay plugs into the fuse/relay box ? Pin 87 & 30 are the compressor clutch coil power supply . If you look on the bottom of the relay you will see four set's of numbers 30 & 87 , 85 & 86 . If you take a piece of wire an jump 30 to 87 this will send B+ voltage to the clutch coil engaging the compressor . Is the PCM turning on the relay ?
The Trainer 40 When the compressor won compress