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Something to check because this has happened to me.....Make sure you have enough coolant in the radiator/overflow tank. IF the engine is running hot, the thermal switch on the AC compressor will turn it off to protect the compressor from overheating and damaging it. Don't go by the guage in the dash, it's usless. Hook up a scan tool and get the exact temp. Shouldn't be over 210 which is normal operating temp.
I am going to assume you meant AC Compressor as the condenser is basically like a radiator in that it cools the freon.
I would say that your freon is probably too low to kick the compressor on. This could be simple as adding some freon (With Leak stop(just to be sure)) would get it working again. The question is, why did it get low? Could be just age and it needs a little freon but usually means that there is a leak somewhere (Hopefully it is not the condenser leaking). Some leaks are small enough that you just need to add freon every month or so but they eventually get bigger. Look for oil around the AC connections and hoses. Could be an O-ring that has gone bad. Hopefully it is simply low on freon.
it will not eliminate the noise. you'll need to replace the bearings.besides from the knocking noise is the air coming out from the vents cold? when you recharge the freon is it totally empty? if thats the case you probably have a leak in the system . check all the lines and connections for leaks using liquid soap add a little bit of water to make it bubbly.start the ac and use a sponge.normally when there is a leak the oil will leak together with the gas so ypu'll need to add some refrigerant oil as well pag oil is best..but i'll need more details so i can help you out
There are a few things to check before I recommend a 2nd opinion. If you have a cabin air filter, check that it is not clogged up with debris or very dirty. Also check that the electric fan comes on as soon as the ac is commanded on. It has 2 speeds (high and low) and it will automatically go to high speed when the AC compressor cuts on to cool off the condenser. Also check that there isn't anything blocking airflow from the front of your vehicle to your radiator/condenser area. Last thing to check would be taking it to a shop that knows what they are doing (it'll probably cost $60+) and make sure your system is fully charged and have them add dye if it isn't so they can locate the leak.
The anti coolant is what is added to your radiator so that the water does not freeze when the temp goes down and damage your pump. hence do not confuse this with the air conditioner. When you put on the a/c the load noise could be the engagement of the solenoid coupling your a/c compressor to the engine. If you notice within the bonnet for the gas filling inlet there must be signs of cooling. if not check over the condenser filter on the glass window for any signs of gas or gas pressure , smoky means low gas but a good pressure of gas indicates good visiblity. If not there has been a gas leak and your whole a/c system needs a check right from the compressor to the condenser to the cooling coils inside the dash. The leak has to identified by a pressure check with air filled, check for blocks before the gas can be filled. The compressor pump pressure must be checked or must be overhauled, replacement of the O rings, and reset. I hope you got an idea to proceed and hope I could help. Good day.
The car should run okay without the compressor, you just won't have A/C. The cooling fans should still operate with the Engine Coolant Temperature sensor. It is also possible that you just need to charge the A/C system. A loud whining noise is indicative of low charge to the compressor.