Question about Volkswagen Passat
The vibration is worse when the car is idling.
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Posted on Jan 02, 2017
SOURCE: Air condition problem
When you say "noisy", is it a metallic grinding noise? Or, did someone overcharge the system. If the compressor IS internally noisy, replacing it is only half of the job. Anytime that comperssors fail, metallic particles get in the system, from the grinding of the compressor vanes or bearings...and need to be removed. Most of the time, they are trapped in a device called the "receiver-dryer", located next to the condenser in the front of the car. So, replace the compressor, replace the receiver-dryer, and evacuate the system. Hold a vacuum for 30 minutes, and then recharge. Not replacing the receiver dryer will damage the new compressor.
Posted on Sep 10, 2008
It shoud have R134a, I would use a recharge kit. If you have a slow leak this will only be a temporary fix. They usually sell a kit with a dye inside the can, If you use that you should be able to locate where the leak is.
Posted on Jul 30, 2009
Depending on whether your car is Injected or Carby induction, The aircon system has an IDLE UP circuit which is supposed to raise the Idle while the Aircon Compressor is engaged. The Compressor cycles on & off to charge the system pressure as required. The Idle up system typically uses an IDLE UP SOLENOID which is usually mounted directly on the throttle linkage at the Carby or Throttle body itself, or a Vacuum Solenoid which switches vacuum to a Diaphram which is connected to a linkage on the Carby or Throttle body itself, or a Vacuum Switch which ports air into the throttle body to raise idle (This type on injected vehicles only). It sounds as if the IDLE UP system has failed or is not adjusted properly. Revving the engine spins the compressor faster thus charging the system sufficiently to dis-engage the compressor, which in turn removes the load from the engine, allowing it to idle again. A simple way to test is to disconnect the Aircon clutch wire (make sure it cannot fall into belt) & switch on the Air with the engine running. The RPM should raise typically around 300 RPM. If it doesn't the IDLE UP is not working. Hope this helps.
Posted on Dec 07, 2009
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