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The only time i have encountered this problem it turned out to be a cracked fan wheel in the blower. fooled me until the fanwheel disengrated and locked up the blower motor.. could be trash in the blower too like leaves, plastic bag etc.
Pop the hood, start the car...with a/c off, ...have someone turn on the a/ c while you watch the compressor/compressor clutch under the hoid...listen and look to see where the sound is coming from...perhaps the compressor needs oil
Hello, This could be an indication your A/C is low on Freon or your Power Steering pump is low on fluid. Both systems are made to increase the idle speed to make the system work better. What happens in the case of the A/C, is the A/C compressor puts a strain on the motor when it engages the electric clutch on the compressor.
The A/C is wired such that when the compressor clutch engages, the engine RPM is increased to maintain the idle speed. The controls do this automatically and when your compressor is low of Freon, there is little resistance and the engine overspeeds. You are burning up your compressor if you lose the lubricant packaged inside it. That noise you hear is a dry compressor.
Turn your A/C or Defroster off and see if the overspeed and the noise stop. The compressor will run in the Defrost cycle too! Eventually your A/C will lose more of the Freon until the low pressure switch cuts the power to the compressor completely.
Some front wheel drive cars have a boost sensor in the power steering assembly for increasing the idle speed when you are turning the steering at low speeds. If the fluid level is low, it tricks the sensor into speeding up the idle to assist steering. Like in the A/C example, you can get overspeed when the fluid levels are low.
I hope my solution is very helpful in fixing your problem. Have your Freon checked or throw in an "OIL Charge" with the proper type of oil for your compressor. Then check your Power steering.
its prob the cooling fan its located in a housing along with the radiator fan at the front of your engine bay look down when you open the hood . and make sure the fan is spinning run the ac on high and wait ( do this while the car is running of course ) . do not run your ac if the fan isnt working . you will burn up the compressor . the noise and vibrations you feel are from the compressor turning on and off. now if the fan is working its prob the compressor. if all else fails take it to a mech where they can test it ... its not pricey and its quick
oh ok, you probably have air shocks and that is the compressor running... makes sense that it sounds with the engine off... it should not be a loud sound though, normally it's quite quiet and you only hear a faint noise... if it is that loud it's probably a bad compressor